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Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 loan | Sep. 30, 2022 loan | Sep. 30, 2023 loan | Sep. 30, 2022 loan | Dec. 31, 2022 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  | 3 |  | 4 |
Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 37
Troubled debt, balance | $ |  |  |  |  | $ 3,471
Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 24
Troubled debt, balance | $ |  |  |  |  | $ 1,849
Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 13
Troubled debt, balance | $ |  |  |  |  | $ 1,622
Real Estate | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 36
Troubled debt, balance | $ |  |  |  |  | $ 3,438
Real Estate | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 24
Troubled debt, balance | $ |  |  |  |  | $ 1,849
Real Estate | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 12
Troubled debt, balance | $ |  |  |  |  | $ 1,589
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 36
Troubled debt, balance | $ |  |  |  |  | $ 3,438
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 24
Troubled debt, balance | $ |  |  |  |  | $ 1,849
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 12
Troubled debt, balance | $ |  |  |  |  | $ 1,589
Real Estate | Other commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  | 3 |  | 4 |
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 0
Troubled debt, balance | $ |  |  |  |  | $ 0
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 0
Troubled debt, balance | $ |  |  |  |  | $ 0
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 0
Troubled debt, balance | $ |  |  |  |  | $ 0
Commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications | 1 |  | 1 |  |
Commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 1
Troubled debt, balance | $ |  |  |  |  | $ 33
Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 0
Troubled debt, balance | $ |  |  |  |  | $ 0
Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 1
Troubled debt, balance | $ |  |  |  |  | $ 33
Commercial | Commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 1
Troubled debt, balance | $ |  |  |  |  | $ 33
Commercial | Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 0
Troubled debt, balance | $ |  |  |  |  | $ 0
Commercial | Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loan modifications |  |  |  |  | 1
Troubled debt, balance | $ |  |  |  |  | $ 33

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