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Loans - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) loan | Mar. 31, 2020 USD ($) loan | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for credit loss expense | $ 2,122,000 | $ 3,079,000 |
Financing receivable, allowance for credit losses, net charge offs | 1,058,000 | 910,000 |
Amortized cost in troubled debt restructurings | 17,105,000 | $ 15,088,000 |
Financing receivable, troubled debt restructuring, allowance for loans | $ 1,385,000 |  | $ 779,000
Minimum period to be considered for loan to have defaulted | 90 days |  |
Loans modified as troubled debt restructuring with subsequent defaults | loan | 0 | 0 |
Principal balances forgiven in connection with loan restructuring | $ 0 | $ 0 |
Trouble Debt Restructuring |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for credit losses, period increase (decrease) | 0 | $ 0 |
Commercial and Industrial Sector |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for credit loss expense | $ 2,349,000 |  |
Specific reserves related to commercial loan relationships | loan | 3 |  |
Financing receivable, allowance for credit losses, net charge offs | $ 907,000 |  |
Impact by commercial loan relationship | loan | 1 |  |

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