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v3.20.4

Loans (Details Textual) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 USD ($) Customer | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Loans Customer | Dec. 31, 2019 USD ($) Loans | Dec. 31, 2018 USD ($) Loans
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total troubled debt restructurings | $ 4,100,000 |  |  |  | $ 4,600,000 |  |  |  | $ 4,100,000 | $ 4,600,000 |
Specific reserves to customers | 436,000 |  |  |  | 61,000 |  |  |  | 436,000 | 61,000 |
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Allowance adjustment charge offs |  |  |  |  |  |  |  |  | 65,000 | 126,000 | $ 66,000
Increase in the allowance for loan losses as a result of the allowance |  |  |  |  |  |  |  |  | 65,000 | 126,000 | 66,000
Provision for loan losses | 3,000,000 | $ 2,600,000 | $ 2,400,000 | $ 1,100,000 | 600,000 | $ 550,000 | $ 750,000 | $ 550,000 | 9,100,000 | 2,450,000 | 3,000,000
Maximum commercial loan and commercial real estate relationships | 750,000 |  |  |  |  |  |  |  | 750,000 |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total troubled debt restructurings | $ 199,800,000 |  |  |  |  |  |  |  | $ 199,800,000 |  |
Number of business customers facilitated assistance | Customer | 1,714 |  |  |  |  |  |  |  | 1,714 |  |
Payments received from forgiveness of loans |  |  |  |  |  |  |  |  | $ 67,600,000 |  |
Percentage of payments received from forgiveness of loans |  |  |  |  |  |  |  |  | 33.80% |  |
Commercial real estate |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific reserves to customers | $ 0 |  |  |  | 0 |  |  |  | $ 0 | 0 |
Provision for loan losses |  |  |  |  |  |  |  |  | 4,745,000 | 848,000 | 650,000
Commercial |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific reserves to customers | 357,000 |  |  |  | 2,000 |  |  |  | 357,000 | 2,000 |
Provision for loan losses |  |  |  |  |  |  |  |  | $ 2,998,000 | 417,000 | 112,000
Payment Deferral |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of months offered, deferrals |  |  |  |  |  |  |  |  | 3 months |  |
Second Three Month Deferral Payments | Commercial real estate |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total troubled debt restructurings | 28,500,000 |  |  |  |  |  |  |  | $ 28,500,000 |  |
Second Three Month Deferral Payments | Commercial |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total troubled debt restructurings | 4,900,000 |  |  |  |  |  |  |  | 4,900,000 |  |
Residential real estate loan |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total troubled debt restructurings | 12,000 |  |  |  | 19,000 |  |  |  | $ 12,000 | $ 19,000 | $ 146,000
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans |  |  |  |  |  |  |  |  | 1 | 1 | 2
Provision for loan losses |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Loans default payment past due period |  |  |  |  |  |  |  |  | 30 days |  |
Troubled debt restructurings |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific reserves to customers | $ 81,000 |  |  |  | $ 61,000 |  |  |  | $ 81,000 | $ 61,000 |
Contractual Interest Rate Reduction | Minimum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction of the notes stated interest rate |  |  |  |  |  |  |  |  | 0.24% |  |
Contractual Interest Rate Reduction | Maximum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction of the notes stated interest rate |  |  |  |  |  |  |  |  | 2.74% |  |
Extended Maturity | Minimum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity period loans |  |  |  |  |  |  |  |  | 2 months |  |
Extended Maturity | Maximum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity period loans |  |  |  |  |  |  |  |  | 183 months |  |

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