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Troubled Debt Restructurings (Details Textual) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 22, 2020 USD ($) | Sep. 30, 2020 USD ($) Loans Customer | Sep. 30, 2019 USD ($) Loans | Sep. 30, 2020 USD ($) Loans Customer | Sep. 30, 2019 USD ($) Loans | Dec. 31, 2019 USD ($)
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Total troubled debt restructurings |  | $ 4,300,000 |  | $ 4,300,000 |  | $ 4,600,000
Specific reserves to loans |  | 326,000 |  | 326,000 |  | 61,000
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 |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | Subsequent Event |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Payments received from forgiveness of loans | $ 1,800,000 |  |  |  |  |
Percentage of payments received from forgiveness of loans | 1.00% |  |  |  |  |
Commercial real estate |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Specific reserves to loans |  | $ 0 |  | $ 0 |  | 0
Commercial |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Specific reserves to loans |  | 246,000 |  | $ 246,000 |  | 2,000
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 |  | 23,800,000 |  | $ 23,800,000 |  |
Second Three Month Deferral Payments | Commercial |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Total troubled debt restructurings |  | $ 5,700,000 |  | $ 5,700,000 |  |
Commercial farmland loans |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans |  | 2 |  | 2 |  |
Financing receivable number of loans past due | Loans |  |  |  | 2 |  |
Commercial loans |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Provision for loan losses |  |  |  | $ 0 |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans |  | 1 | 4 | 1 | 4 |
Loans default payment past due period |  |  |  | 30 days |  |
Residential real estate loan |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  | 0
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans |  |  | 2 |  | 2 |
Loans default payment past due period |  |  |  |  | 30 days |
Residential real estate, Home equity lines of credit |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans |  |  | 1 |  | 1 |
Troubled debt restructurings |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Specific reserves to loans |  | $ 82,000 |  | $ 82,000 |  | $ 61,000
Allowance adjustment charge offs |  | 33,000 | $ 42,000 | 72,000 | $ 93,000 |
Provision for loan losses |  | $ 33,000 | $ 42,000 | $ 72,000 | $ 93,000 |
Contractual Interest Rate Reduction |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Reduction of the notes stated interest rate |  | 2.25% |  |  |  |
Contractual Interest Rate Reduction | Minimum |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Reduction of the notes stated interest rate |  |  |  | 1.00% | 0.24% |
Contractual Interest Rate Reduction | Maximum |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Reduction of the notes stated interest rate |  |  |  | 2.25% | 2.74% |
Extended Maturity |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Maturity period loans |  | 48 months |  |  |  |
Extended Maturity | Minimum |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Maturity period loans |  |  |  | 48 months | 86 months |
Extended Maturity | Maximum |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Maturity period loans |  |  |  | 183 months | 124 months |

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