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Loans - Additional Information (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2021 USD ($) payment | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) loan payment | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Paycheck protection program | $ 25,800,000 |  |  |  | $ 208,900,000 |  |  |  | $ 25,800,000 | $ 208,900,000 |
Deferred loan costs | 1,900,000 |  |  |  | 1,700,000 |  |  |  | $ 1,900,000 | 1,700,000 |
Period of loan sold |  |  |  |  |  |  |  |  | 30 days |  |
Minimum period seldom held |  |  |  |  |  |  |  |  | 90 days |  |
Mortgage warehousing maximum pay off period |  |  |  |  |  |  |  |  | 30 days |  |
Nonaccrual interest income |  |  |  |  |  |  |  |  | $ 0 | 0 |
Non-accrual loans | 14,962,000 |  |  |  | 22,142,000 |  |  |  | 14,962,000 | 22,142,000 |
Non-performing TDRs | 1,500,000 |  |  |  |  |  |  |  | 1,500,000 |  |
TDR loans | $ 1,521,000 |  |  |  | 2,610,000 |  |  |  | $ 1,521,000 | 2,610,000 |
Restructured loan returned to accruing status number of Consecutive Payments of loan | payment | 6 |  |  |  |  |  |  |  | 6 |  |
Restructured loan reported in TDRs | $ 3,912,000 |  |  |  | 4,403,000 |  |  |  | $ 3,912,000 | 4,403,000 |
Specific reserves allocated to troubled debt restructuring | 0 |  |  |  |  |  |  |  | 0 |  |
Credit loss expense (recovery) | (2,071,000) | $ 1,112,000 | $ (1,492,000) | $ 367,000 | 3,042,000 | $ 2,052,000 | $ 7,057,000 | $ 8,600,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans with an aggregate credit exposure | 3,000,000 |  |  |  |  |  |  |  | $ 3,000,000 |  |
Loans classified as TDR after a period |  |  |  |  |  |  |  |  | 90 days |  |
Minimum | Good Pass |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of consecutive years of profit for Good Pass Rating |  |  |  |  |  |  |  |  | 3 years |  |
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating |  |  |  |  |  |  |  |  | 5 years |  |
Number of years of Satisfactory Relationship with bank for Good Pass Rating |  |  |  |  |  |  |  |  | 5 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans with an aggregate credit exposure | 6,000,000 |  |  |  |  |  |  |  | $ 6,000,000 |  |
Loans classified as TDR after a period |  |  |  |  |  |  |  |  | 120 days |  |
Maximum | Satisfactory Pass |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating |  |  |  |  |  |  |  |  | 2 years |  |
CARES Act |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructured loan reported in TDRs | 10,900,000 |  |  |  | 126,700,000 |  |  |  | $ 10,900,000 | 126,700,000 |
Performing |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructured loan reported in TDRs | 2,400,000 |  |  |  | $ 1,800,000 |  |  |  | $ 2,400,000 | $ 1,800,000 |
Number TDRs returned to accrual status | loan |  |  |  |  |  |  |  |  | 5 | 1 |
Loans Purchased With Evidence of Credit Deterioration |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans | 2,200,000 |  |  |  |  |  |  |  | $ 2,200,000 |  |
Non-performing TDRs | $ 290,000 |  |  |  |  |  |  |  | $ 290,000 |  |
Credit loss expense (recovery) |  |  |  |  |  |  |  |  |  |  | $ 133,000
Allowances for loan losses |  |  |  |  |  |  |  |  |  |  | $ 0

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