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Troubled Debt Restructurings (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) Loans Customer | Mar. 31, 2020 USD ($) Loans | Dec. 31, 2020 USD ($)
Financing Receivable Modifications [Line Items] |  |  |
Total troubled debt restructurings | $ 3,900,000 |  | $ 4,100,000
Specific reserves to loans |  |  | 436,000
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings | 0 |  | 0
Provision for credit losses | 425,000 | $ 1,100,000 |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Total troubled debt restructurings | $ 199,800,000 |  |
Number of business customers facilitated assistance | Customer | 1,714 |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | First Round of PPP Loan |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Payments received from forgiveness of loans | $ 137,200,000 |  |
Percentage of payments received from forgiveness of loans | 68.70% |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | Second Round of PPP Loan |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Payments received from forgiveness of loans | $ 75,100,000 |  |
Payment Deferral |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of months offered, deferrals | 3 months |  |
Residential real estate loan |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Provision for loan losses |  |  | 0
Loans default payment past due period | 30 days |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans | 1 |  |
Commercial loans |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Provision for loan losses | $ 0 |  |
Loans default payment past due period | 30 days |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans | 1 | 1 |
Commercial farmland loans |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans | 2 | 2 |
Minimum | Payment Deferral |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of months offered, deferrals | 3 months |  |
Maximum | Payment Deferral |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of months offered, deferrals | 9 months |  |
Troubled debt restructurings |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Specific reserves to loans | $ 94,000 |  | $ 81,000
Allowance adjustment charge offs | 20,000 | $ 5,000 |
Provision for credit losses | $ 20,000 | $ 5,000 |
Contractual Interest Rate Reduction |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Reduction of the notes stated interest rate | 4.075% |  |
Extended Maturity |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Maturity period loans | 22 days |  |
Extended Maturity | Minimum |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Maturity period loans |  | 168 months |
Extended Maturity | Maximum |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Maturity period loans |  | 180 months |

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