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Troubled Debt Restructurings (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Loans Customer | Sep. 30, 2020 USD ($) Loans | Sep. 30, 2021 USD ($) Loans Customer | Sep. 30, 2020 USD ($) Loans | Dec. 31, 2020 USD ($)
Financing Receivable Modifications [Line Items] |  |  |  |  |
Total troubled debt restructurings | $ 4,000,000.0 |  | $ 4,000,000.0 |  | $ 4,100,000
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings | 0 |  | 0 |  | 0
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 | $ 84,000,000.0 |  |  |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | PPP Loan Originated In 2020 |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Payments received from forgiveness of loans |  |  | $ 198,400,000 |  |
Percentage of payments received from forgiveness of loans |  |  | 99.20% |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | PPP Loan Originated In 2021 |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Payments received from forgiveness of loans | $ 29,200,000 |  |  |  |
Percentage of payments received from forgiveness of loans | 34.70% |  |  |  |
Consumer, Indirect |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans | 1 |  | 1 |  |
Payment Deferral |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Number of months offered, deferrals |  |  | 3 months |  |
Residential Mortgage |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans | 1 |  | 1 |  |
Loans default payment past due period |  |  |  | 30 days |
Provision for loan losses |  |  |  |  | 0
Commercial loans |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Provision for loan losses |  |  | $ 0 |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans | 2 | 1 | 2 | 1 |
Financing receivable number of loans past due | Loans |  |  | 1 |  |
Loans default payment past due period |  |  | 30 days |  |
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 |  |  | 12 months |  |
Troubled debt restructurings |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Specific reserves to loans | $ 109,000 |  | $ 109,000 |  | $ 81,000
Allowance adjustment charge offs | 15,000 | $ 33,000 | 91,000 | $ 72,000 |
Provision for loan losses | $ 15,000 | $ 33,000 | $ 90,000 | $ 72,000 |
Extended Maturity |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Maturity period loans |  | 48 months |  |  |
Extended Maturity | Minimum |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Maturity period loans | 193 months |  | 22 days | 48 months |
Extended Maturity | Maximum |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Maturity period loans |  |  | 361 months | 183 months |
Contractual Interest Rate Reduction |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Reduction of the notes stated interest rate | 0.25% | 2.25% |  |  |
Contractual Interest Rate Reduction | Minimum |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Reduction of the notes stated interest rate |  |  | 0.25% | 1.00% |
Contractual Interest Rate Reduction | Maximum |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Reduction of the notes stated interest rate |  |  | 4.075% | 2.25% |

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