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Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 loan | Dec. 31, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 1 | 5 |
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 35 |  |
Troubled debt, balance | $ | $ 82,000 |  |
Loans, Excluding Acquired Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 47 |  | 54
Troubled debt, balance | $ | $ 6,801 |  | $ 7,513
Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 32 |  | 32
Troubled debt, balance | $ | $ 4,251 |  | $ 3,138
Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 15 |  | 22
Troubled debt, balance | $ | $ 2,550 |  | $ 4,375
Real Estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 1 | 5 |
Real Estate | Loans, Excluding Acquired Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 43 |  | 48
Troubled debt, balance | $ | $ 4,956 |  | $ 5,260
Real Estate | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 30 |  | 29
Troubled debt, balance | $ | $ 3,814 |  | $ 2,512
Real Estate | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 13 |  | 19
Troubled debt, balance | $ | $ 1,142 |  | $ 2,748
Real Estate | Single family residential |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications |  | 5 |
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 40 |  | 46
Troubled debt, balance | $ | $ 4,135 |  | $ 5,199
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 28 |  | 28
Troubled debt, balance | $ | $ 2,994 |  | $ 2,463
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 12 |  | 18
Troubled debt, balance | $ | $ 1,141 |  | $ 2,736
Real Estate | Other commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 1 |  |
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 3 |  | 2
Troubled debt, balance | $ | $ 821 |  | $ 61
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 2 |  | 1
Troubled debt, balance | $ | $ 820 |  | $ 49
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 1 |  | 1
Troubled debt, balance | $ | $ 1 |  | $ 12
Commercial | Loans, Excluding Acquired Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 4 |  | 6
Troubled debt, balance | $ | $ 1,845 |  | $ 2,253
Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 2 |  | 3
Troubled debt, balance | $ | $ 437 |  | $ 626
Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 2 |  | 3
Troubled debt, balance | $ | $ 1,408 |  | $ 1,627
Commercial | Commercial | Loans, Excluding Acquired Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 4 |  | 6
Troubled debt, balance | $ | $ 1,845 |  | $ 2,253
Commercial | Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 2 |  | 3
Troubled debt, balance | $ | $ 437 |  | $ 626
Commercial | Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loan modifications | 2 |  | 3
Troubled debt, balance | $ | $ 1,408 |  | $ 1,627

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