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Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) - Loans, Excluding Acquired Loans $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 43 | 49
Troubled debt, balance | $ | $ 6,042 | $ 6,939
Accruing TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 26 | 31
Troubled debt, balance | $ | $ 3,424 | $ 4,289
Nonaccrual TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 17 | 18
Troubled debt, balance | $ | $ 2,618 | $ 2,650
Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 39 | 45
Troubled debt, balance | $ | $ 4,211 | $ 5,097
Real Estate | Accruing TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 24 | 29
Troubled debt, balance | $ | $ 2,998 | $ 3,853
Real Estate | Nonaccrual TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 15 | 16
Troubled debt, balance | $ | $ 1,213 | $ 1,244
Real Estate | Single family residential |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 37 | 42
Troubled debt, balance | $ | $ 3,405 | $ 4,283
Real Estate | Single family residential | Accruing TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 23 | 28
Troubled debt, balance | $ | $ 2,238 | $ 3,087
Real Estate | Single family residential | Nonaccrual TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 14 | 14
Troubled debt, balance | $ | $ 1,167 | $ 1,196
Real Estate | Other commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 2 | 3
Troubled debt, balance | $ | $ 806 | $ 814
Real Estate | Other commercial | Accruing TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 1 | 1
Troubled debt, balance | $ | $ 760 | $ 766
Real Estate | Other commercial | Nonaccrual TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 1 | 2
Troubled debt, balance | $ | $ 46 | $ 48
Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 4 | 4
Troubled debt, balance | $ | $ 1,831 | $ 1,842
Commercial | Accruing TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 2 | 2
Troubled debt, balance | $ | $ 426 | $ 436
Commercial | Nonaccrual TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 2 | 2
Troubled debt, balance | $ | $ 1,405 | $ 1,406
Commercial | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 4 | 4
Troubled debt, balance | $ | $ 1,831 | $ 1,842
Commercial | Commercial | Accruing TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 2 | 2
Troubled debt, balance | $ | $ 426 | $ 436
Commercial | Commercial | Nonaccrual TDR Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loan modifications | loan | 2 | 2
Troubled debt, balance | $ | $ 1,405 | $ 1,406

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