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Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 4 | 5
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 51 | 3,729
Troubled debt, balance | $ | $ 8,600 | $ 2,990,000
Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 49 | 54
Troubled debt, balance | $ | $ 6,939 | $ 7,513
Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 31 | 32
Troubled debt, balance | $ | $ 4,289 | $ 3,138
Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 18 | 22
Troubled debt, balance | $ | $ 2,650 | $ 4,375
Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 4 | 5
Real Estate | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 45 | 48
Troubled debt, balance | $ | $ 5,097 | $ 5,260
Real Estate | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 29 | 29
Troubled debt, balance | $ | $ 3,853 | $ 2,512
Real Estate | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 16 | 19
Troubled debt, balance | $ | $ 1,244 | $ 2,748
Real Estate | Single family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 3 | 5
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 42 | 46
Troubled debt, balance | $ | $ 4,283 | $ 5,199
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 28 | 28
Troubled debt, balance | $ | $ 3,087 | $ 2,463
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 14 | 18
Troubled debt, balance | $ | $ 1,196 | $ 2,736
Real Estate | Other commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 1 |
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 3 | 2
Troubled debt, balance | $ | $ 814 | $ 61
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 1 | 1
Troubled debt, balance | $ | $ 766 | $ 49
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 2 | 1
Troubled debt, balance | $ | $ 48 | $ 12
Commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 4 | 6
Troubled debt, balance | $ | $ 1,842 | $ 2,253
Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 2 | 3
Troubled debt, balance | $ | $ 436 | $ 626
Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 2 | 3
Troubled debt, balance | $ | $ 1,406 | $ 1,627
Commercial | Commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 4 | 6
Troubled debt, balance | $ | $ 1,842 | $ 2,253
Commercial | Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 2 | 3
Troubled debt, balance | $ | $ 436 | $ 626
Commercial | Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 2 | 3
Troubled debt, balance | $ | $ 1,406 | $ 1,627

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