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Loans and Allowance for Credit Losses - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) contract commitment | Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net deferred origination fees | $ 11,500,000 | $ 11,735,000 |
Premiums (discounts) associated with acquired loans | 0 | (47,000) |
Accrued interest on loans | 5,500,000 | 7,100,000 |
PPP loans | $ 1,402,147,000 | 1,422,914,000 |
Loans secured by real estate | 75.00% |  |
Loans unsecured | 1.00% |  |
Loans secured for general commercial uses | 24.00% |  |
Allowance for credit losses | $ 11,739,000 | 21,136,000 | $ 19,088,000
Nonaccrual loans | 11,650,000 | 11,120,000 |
Interest income which would have been earned on nonaccrual loans | 744,000 | 856,000 | 1,300,000
Interest on nonaccrual loans reversed through interest income | 10,000 | 12,000 |
Interest earned on nonaccrual loans | 1,600,000 | 924,000 | 301,000
Loans classified as troubled debt restructuring | $ 10,638,000 | 7,900,000 |
Number of commitments on TDR | commitment | 0 |  |
Charge offs on loans later classified as TDRs | $ 0 | $ 0 |
Number of TDRs that defaulted within twelve months of restructure | contract | 0 | 0 |
Unfunded loan commitments | $ 115,000 | $ 15,000 |
Loans pledged as collateral | 0 | 0 |
Net of government guarantees |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | 10,672,000 | 9,637,000 |
Commercial & industrial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for credit losses | 3,027,000 | 7,973,000 | $ 6,604,000
Nonaccrual loans | 4,350,000 | 3,848,000 |
Commercial & industrial loans | PPP Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
PPP loans | $ 118,200,000 | $ 304,600,000 |

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