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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Allowance for credit losses | $ 67,300,000 |  |  |
Troubled Debt Restructurings Internal Grading System Substandard |  | $ 2,800,000 |  | $ 2,900,000
Financing Receivables, Troubled Debt Restructuring |  | 3,700,000 |  | 3,900,000
Non-accrual loans for no related allowance amortized cost |  | 3,300,000 |  |
TDR loans evaluated on individual | 100,000 |  |  |
After-tax effect decreased retained earnings | 14,200,000 |  |  |
Troubled Debt Restructurings Returned to Accrual Status |  | 221,000 | $ 27,000 |
Loans and Leases Receivable, Allowance |  | 60,797,000 |  | 60,754,000
Impaired Financing Receivable, Related Allowance |  | 218,000 |  | 495,000
Provision for Loan and Lease Losses |  | 0 | 300,000 |
FDIC-acquired loans and remaining Accretable yield |  | 204,000 |  | $ 429,000
Minimum loan balance with addition to TDR status for classification of loans into Collateral-dependent loans |  | 100,000 |  |
Allowance for unfunded commitment |  |  |  |
Allowance for credit losses | 8,700,000 |  |  |
PCI [Member] |  |  |  |
Allowance for credit losses | 1,900,000 |  |  |
Adopted ASC 326 [Member] |  |  |  |
Loans and Leases Receivable, Allowance | $ 11,600,000 |  |  |
CECL Methodology [Member] |  |  |  |
Provision for Loan and Lease Losses |  |  | 300,000 |
CECL Methodology [Member] | Allowance for unfunded commitment |  |  |  |
Provision for Loan and Lease Losses |  | $ 193,000 | $ 673,000 |

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