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v3.21.2

Allowance for Loan Losses - Additional information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Provision expense for loan losses | $ 350,000 | $ 675,000 | $ 850,000 | $ 1,300,000 |  |  |  |  |
Non-performing assets as a percent of loans | 0.31% |  | 0.31% |  | 0.31% |  | 0.34% |  |
Allowance for Loan and Lease Losses Write-offs, Net |  |  | $ 71,000 | $ 295,000 |  |  |  |  |
Allowance For Loan And Lease Losses Write Off Percentage |  |  | 0.01% | 0.04% |  |  |  |  |
Increase in allowance for loan losses |  |  |  |  | $ 1,800,000 |  |  |  |
Percentage increase in the allowance balance |  |  |  |  | 17.90% |  |  |  |
Allowance for loan losses | $ 12,124,000 | 10,284,000 | $ 12,124,000 | $ 10,284,000 | $ 12,124,000 | $ 11,752,000 | $ 11,345,000 | $ 9,699,000 | $ 9,279,000
Percentage Of Allowance For Non Performing Assets | 389.00% |  | 389.00% |  | 389.00% |  | 341.00% |  |
Percentage Of Allowance For Total Loans | 1.22% |  | 1.22% |  | 1.22% |  | 1.16% |  |
Financing Receivable, Individually Evaluated for Impairment | $ 2,206,000 |  | $ 2,206,000 |  | $ 2,206,000 |  | $ 855,000 |  |
Provision recovery recorded | (350,000) | (675,000) | (850,000) | (1,300,000) |  |  |  |  |
Increase in provision expense | 250,000 |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due | 2,789,000 |  | 2,789,000 |  | 2,789,000 |  | 7,839,000 |  |
Non-performing |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Total loans | $ 3,100,000 |  | $ 3,100,000 |  | $ 3,100,000 |  | $ 3,300,000 |  |
Non-performing assets as a percent of loans | 0.31% |  | 0.31% |  | 0.31% |  | 0.34% |  |
Pass |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Minimum individual loan balance requiring quarterly review | $ 2,000,000 |  | $ 2,000,000 |  | $ 2,000,000 |  |  |  |
Special Mention |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Minimum individual loan balance requiring quarterly review | 250,000 |  | 250,000 |  | 250,000 |  |  |  |
Substandard |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Minimum individual loan balance requiring quarterly review | 250,000 |  | 250,000 |  | 250,000 |  |  |  |
Doubtful |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Minimum individual loan balance requiring quarterly review | 100,000 |  | 100,000 |  | 100,000 |  |  |  |
Commercial | Commercial. |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses | 3,124,000 | 3,036,000 | 3,124,000 | 3,036,000 | 3,124,000 | $ 3,534,000 | $ 3,472,000 | $ 3,784,000 | $ 3,951,000
Financing Receivable, Individually Evaluated for Impairment | 2,200,000 |  | 2,200,000 |  | 2,200,000 |  | 847,000 |  |
Minimum aggregate balances for commercial loan relationship under structure loan rating process | 1,000,000 |  | 1,000,000 |  | 1,000,000 |  |  |  |
Provision recovery recorded | 445,000 | $ 638,000 | 253,000 | $ 805,000 |  |  |  |  |
Commercial | Commercial and Industrial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due | 420,000 |  | $ 420,000 |  | 420,000 |  | $ 3,139,000 |  |
Commercial | Minimum | Commercial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Minimum percent of portfolio to be reviewed |  |  | 36.00% |  |  |  |  |  |
Consumer | Minimum | Consumer and Residential Mortgage Loans [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | $ 150,000 |  | $ 150,000 |  | $ 150,000 |  |  |  |

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