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Financing Receivable [Axis] Total non-interest expense Noninterest Expense Total time deposits Time Deposits Schedule Of Related Party Loans [Roll Forward] Schedule Of Related Party Loans [Roll Forward] Schedule Of Related Party Loans Debt Disclosure [Abstract] Debt Disclosure [Abstract] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Number of reportable segments Number of Reportable Segments Income per common share: Earnings Per Share [Abstract] Subsequent Event [Line Items] Subsequent Event [Line Items] Total capital (to risk-weighted assets), capital conservation buffer (in percent) Banking Regulation, Capital Conservation Buffer, Total Risk-Based Capital, Actual Total capital (to risk-weighted assets), Required for Capital Adequacy Purposes, Ratio (in percent) Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] Affiliated Entity Affiliated Entity [Member] Common stock, no par value; 100,000,000 shares authorized; 17,256,989 shares issued and outstanding at December 31, 2023; 17,241,926 shares issued and outstanding at December 31, 2022 Common Stock, Value, Issued Commercial Real Estate, Commercial Commercial Real Estate [Member] Less than twelve continuous months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months After one but within five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Less: Income tax expense (benefit) related to other comprehensive income (loss) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Loans, including fees Interest and Fee Income, Loans and Leases Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, 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Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Recently Issued Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Fair Value Securities held-to-maturity Debt Securities, Held-to-Maturity, Fair Value Pass Pass [Member] Concentration risk (in percent) Concentration Risk, Percentage Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Gain on sale of loans Gain (Loss) on Sale of Loans and Leases Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Federal Home Loan Bank Stock Federal Home Loan Bank Stock [Policy Text Block] Federal Home Loan Bank Stock ICS ICS [Member] ICS [Member] Shares granted (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Loans and Allowance for Credit Losses 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Compensation Related Costs, Policy [Policy Text Block] Interest-bearing Total interest-bearing deposits Interest-Bearing Deposit Liabilities Minimum Minimum [Member] Other Noninterest Income, Other Operating Income Premises and equipment, net Premises and equipment, net Property, Plant and Equipment, Net Tier 1 Leverage, Required for Capital Adequacy Purposes, Amount Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Receivables [Abstract] Receivables [Abstract] Cash dividends paid (in USD per share) Common Stock, Dividends, Per Share, Cash Paid Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Tier 1 leverage, Actual Ratio, Amount Banking Regulation, Tier 1 Leverage Capital, Actual ASSETS Assets: Assets [Abstract] After ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Available-for-Sale Available-for-Sale Securities, Debt Maturities [Abstract] Decrease in operating lease 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Principles of Consolidation Consolidation, Policy [Policy Text Block] Tier 1 capital (to risk-weighted assets), Ratio to be Well-Capitalized under Prompt Corrective Action Provisions, Amount Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Entity Controlled By Existing And Former Board Members And Affiliates Entity Controlled By Existing And Former Board Members And Affiliates [Member] Entity Controlled By Existing And Former Board Members And Affiliates Proceeds from subordinated note issuance Proceeds from Issuance of Debt Document Transition Report Document Transition Report Equity in undistributed banking subsidiary income Income (Loss) from Equity Method Investments, Net of Dividends or Distributions PPP Paycheck Protection Program ("PPP") [Member] Paycheck Protection Program ("PPP") [Member] Unsecured Commercial, Unsecured Unsecured Debt [Member] Deposit liability Deposit Liability, Current Schedule of Pledged Investment Securities Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Bank-owned Life Insurance Life Insurance, Corporate or Bank Owned [Text Block] Transfers out Transfers Out Of Other Receivables Transfers Out Of Other Receivables Net change in deposits Increase (Decrease) in Deposits Temporary Administrative Office In San Francisco Temporary Administrative Office In San Francisco [Member] Temporary Administrative Office In San Francisco Total current tax expense Current Federal, State and Local, Tax Expense (Benefit) Common stock, shares authorized (in shares) Common Stock, Shares Authorized Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Securities available-for-sale, at fair value, net of allowance for credit losses of $0 at December 31, 2023 and 2022 (amortized cost of $124,788 and $135,087 at December 31, 2023 and 2022, respectively) Securities available-for-sale Debt Securities, Available-for-Sale Total capital (to risk-weighted assets), Ratio to be Well-Capitalized under Prompt Corrective Action Provisions, Amount Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Low income housing credits Proceeds From Low Income Housing Credits Proceeds From Low Income Housing Credits Entity Public Float Entity Public Float Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax FHLB advances Proceeds from FHLBank Borrowings, Financing Activities Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Substandard Substandard [Member] Within one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Tier 1 leverage, Actual Ratio, Ratio (in percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Title of Individual [Domain] Title of Individual [Domain] Automobiles Bank automobiles Automobiles [Member] Supplemental employee retirement plan Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits Federal Reserve Discount Window Federal Reserve Discount Window [Member] Federal Reserve Discount Window Other Commitments [Axis] Other Commitments [Axis] BOLI BOLI [Policy Text Block] BOLI Executive Officer Executive Officer [Member] After five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Derivatives – interest rate swap Derivative Asset Federal Reserve Bank Of San Francisco Federal Reserve Bank Of San Francisco [Member] Federal Reserve Bank Of San Francisco Shares forfeited (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Loans held for investment, net of allowance for credit losses Loans Receivable, Fair Value Disclosure ROUA Deferred Tax Liabilities, Leasing Arrangements Deferred tax provision Deferred Income Tax Expense (Benefit) Subsequent Event Type [Axis] Subsequent Event Type [Axis] Residential Real estate, Residential Residential Real Estate [Member] Doubtful Doubtful [Member] Right of use liability Deferred Tax Assets, Right Of Use Liability Deferred Tax Assets, Right Of Use Liability Commitment for low income housing tax credits Low Income Housing Credits, Commitment Low 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Loan, Held-for-Sale Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Interest-bearing deposits in banks Interest-Bearing Deposits in Banks and Other Financial Institutions Entity Registrant Name Entity Registrant Name Change in other assets Increase (Decrease) in Other Operating Assets Total deferred tax benefit Deferred Federal, State and Local, Tax Expense (Benefit) Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Lease Contractual Term [Axis] Lease Contractual Term [Axis] Other time accounts Interest Expense Domestic Deposit Liabilities, Other Time Deposit Auditor Name Auditor Name Document Period End Date Document Period End Date Schedule of Non-accrual Loans Financing Receivable, Nonaccrual [Table Text Block] Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Interest Receivable and Other Assets [Abstract] Disclosure of Activity in the Allowance For Loan Losses Schedule Of Activity In The Allowance For Loan Losses [Table Text Block] Schedule Of Activity In The Allowance For Loan Losses Undisbursed agricultural real estate loans Undisbursed Agricultural Real Estate Loans [Member] Undisbursed Agricultural Real Estate Loans [Member] Entity Central Index Key Entity Central Index Key After one but within five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Percentage of deposits over five million deposits Percentage of Deposits over $5 Million to Deposits Percentage of Deposits over $5 Million to Deposits Purchase of BOLI Payment to Acquire Life Insurance Policy, Investing Activities Provision for income taxes Provision for income taxes Income tax benefit Income Tax Expense (Benefit) Interest receivable and other assets Interest receivable and other assets Interest Receivable and Other Assets Fixed-to-floating Rate Subordinated Notes Issued Sep 2017 Fixed-to-floating Rate Subordinated Notes Issued Sep 2017 [Member] Fixed-to-floating Rate Subordinated Notes Issued Sep 2017 Watch Watch [Member] Watch [Member] Loan-related fees Loan-Related Fees Loan-Related Fees Charge-offs Financing Receivable, Allowance for Credit Loss, Writeoff Fair Value of Assets and Liabilities Fair Value Disclosures [Text Block] Provision (Benefit) Provision Financing Receivable, Credit Loss, Expense (Reversal) Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Twelve continuous months or longer, unrealized loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Shareholders’ Equity: Equity [Abstract] Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Net unrealized loss on securities 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subsidiary income Subsidiary Or Equity Method Investee, Undistributed Banking Subsidiary Income Subsidiary Or Equity Method Investee, Undistributed Banking Subsidiary Income Weighted average diluted common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Matching contribution vesting percentage (in percent) Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage Undisbursed commercial real estate loans Undisbursed Commercial Real Estate Loans [Member] Undisbursed Commercial Real Estate Loans [Member] Grantee Status [Domain] Grantee Status [Domain] Assets: Assets, Total [Member] Total commitments and standby letters of credit Other Commitment Deposits Deposits [Member] Net loss (gain) on sale of securities available-for-sale Gross realized (losses) gains Debt Securities, Available-for-Sale, Realized Gain (Loss) Total interest and fee income Dividends from banking subsidiary Interest and Dividend Income, Operating Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Cash and cash equivalents Cash And Cash Equivalents, Less Time Deposits, At Carrying Value Cash And Cash Equivalents, Less Time Deposits, At Carrying Value Purchase of premises and equipment Payments to Acquire Property, Plant, and Equipment Investment in banking subsidiary Investment In Banking Subsidiary Investment In Banking Subsidiary Document Annual Report Document Annual Report Allowance for credit losses Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss 30-59 Days Financial Asset, 30 to 59 Days Past Due [Member] Total assets Assets Assets After ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Cover [Abstract] Cover [Abstract] Equipment Equipment [Member] Schedule of Composition of Network Deposits Schedule of Composition of Network Deposits [Table Text Block] Schedule of Composition of 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Risk Type [Domain] Depreciation Deferred Tax Liabilities, Property, Plant and Equipment Tier 1 capital (to risk-weighted assets), Actual Ratio, Amount Banking Regulation, Tier 1 Risk-Based Capital, Actual Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Proceeds from issuance initial public offering Proceeds from Issuance Initial Public Offering Consolidated Entities [Domain] Consolidated Entities [Domain] Total deferred tax liabilities Deferred Tax Liabilities, Gross Subordinated notes, net Subordinated notes and other liabilities Subordinated Debt Percentage of principal amount redeemed (in percent) Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 2028 Time Deposit Maturities, Year Five 2026 Time Deposit Maturities, Year Three Securities held-to-maturity, at amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss Residential construction Real estate, Residential construction Real Estate Residential Construction Loans [Member] Real Estate Residential Construction Loans [Member] Statement [Line Items] Statement [Line Items] Deferred tax benefit: Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract] Fair Value Estimate of Fair Value Measurement [Member] Discount for present value of expected cash flows Lessee, Operating Lease, Liability, To Be Paid, Discount For Present Value Lessee, Operating Lease, Liability, To Be Paid, Discount For Present Value Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Common equity tier 1 capital (to risk-weighted assets), Ratio to be Well-Capitalized under Prompt Corrective Action Provisions, Ratio (in percent) Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum Condensed Financial Statements [Table] Condensed Financial Statements [Table] Long-term line of 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