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Loans Schedule of troubled debt restructurings on financing receivables (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) contracts | Dec. 31, 2021 USD ($) contracts | Dec. 31, 2020 USD ($) contracts
Financing Receivable, Impaired [Line Items] |  |  |
Troubled Debt Restructuring, Classification removed | $ 1,000,000 | $ 4,100,000 |
TDRs included in nonaccrual loan totals | 17,500,000 | 20,900,000 |
Nonaccrual TDRs considered current | 7,500,000 | 10,500,000 |
TDRs included in accruing loan totals | 20,100,000 | 28,300,000 |
Loans and Leases Receivable, Impaired, Commitment to Lend | 1,600,000 | 3,000,000 |
Specific Reserves Related To Troubled Debt Restructuring | 2,200,000 | 300,000 |
Additional specific reserves related to troubled debt restructuring | 900,000 | 200,000 | $ 7,000
Modified substandard commercial loans, total recorded investment | 29,600,000 | 200,000 |
Modified substandard consumer loans total recorded investment | 41,700,000 | 32,900,000 |
Nonaccrual loans not classified as TDRs at prior fiscal year end | $ 1,000,000 | $ 5,400,000 | $ 400,000
Financing Receivable, Modifications, Number of Contracts | contracts | 156 | 195 | 292
Total Recorded Investment Modified as TDRs During Period | $ 9,995,000 | $ 13,484,000 | $ 10,346,000
Commercial Financial Agricultural less PPP and Overdrafts |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 12 | 10 |
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification | $ 5,738,000 | $ 1,525,000 |
GFSC loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 0 | 0 |
Check Loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 0 | 0 |
Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 4,517,000 | $ 4,046,000 | 1,569,000
Accruing Financing Receivable Modifications [Member] | Commercial Financial Agricultural less PPP and Overdrafts |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification | 2,254,000 | 1,356,000 |
Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 5,478,000 | 9,438,000 | $ 8,777,000
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial Agricultural less PPP and Overdrafts |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification | $ 3,484,000 | $ 169,000 |
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts |  |  | 12
Total Recorded Investment Modified as TDRs During Period |  |  | $ 3,813,000
Commercial Financial And Agricultural [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | 107,000
Commercial Financial And Agricultural [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | $ 3,706,000
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 9 | 15 | 9
Total Recorded Investment Modified as TDRs During Period | $ 1,853,000 | $ 8,749,000 | $ 3,235,000
Commercial Real Estate Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 1,040,000 | 2,002,000 |
Commercial Real Estate Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 813,000 | $ 6,747,000 | $ 3,235,000
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 1 | 1 | 0
Total Recorded Investment Modified as TDRs During Period | $ 41,000 |  |
Construction Real Estate Remaining Commercial [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 41,000 |  |
Construction Real Estate Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts |  |  | 1
Total Recorded Investment Modified as TDRs During Period |  |  | $ 26,000
Construction Real Estate Mortgage [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | $ 26,000
Construction Real Estate Installment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts |  |  | 1
Total Recorded Investment Modified as TDRs During Period |  |  | $ 14,000
Construction Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | 0
Construction Real Estate Installment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | $ 14,000
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 4 | 5 | 3
Total Recorded Investment Modified as TDRs During Period | $ 295,000 | $ 669,000 | $ 156,000
Residential Real Estate Commercial [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 21,000 | 95,000 | 153,000
Residential Real Estate Commercial [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 274,000 | $ 574,000 | $ 3,000
Residential Real Estate Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 15 | 14 | 27
Total Recorded Investment Modified as TDRs During Period | $ 1,233,000 | $ 542,000 | $ 1,956,000
Residential Real Estate Mortgage [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 865,000 | 146,000 | 888,000
Residential Real Estate Mortgage [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 368,000 | $ 396,000 | $ 1,068,000
Residential Real Estate Home Equity Line Of Credit [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 3 | 8 | 7
Total Recorded Investment Modified as TDRs During Period | $ 11,000 | $ 316,000 | $ 66,000
Residential Real Estate Home Equity Line Of Credit [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 0 | 211,000 | 14,000
Residential Real Estate Home Equity Line Of Credit [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 11,000 | $ 105,000 | $ 52,000
Residential Real Estate Installment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 12 | 8 | 18
Total Recorded Investment Modified as TDRs During Period | $ 168,000 | $ 120,000 | $ 228,000
Residential Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 141,000 | $ 120,000 | 163,000
Residential Real Estate Installment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 27,000 |  | $ 65,000
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 10 | 1 |
Total Recorded Investment Modified as TDRs During Period | $ 101,000 | $ 325,000 |
Finance Leases Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 101,000 | $ 325,000 |
Construction Real Estate Retail |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 1 | 2 |
Total Recorded Investment Modified as TDRs During Period |  | $ 705,000 |
Construction Real Estate Retail | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 0 | 0 |
Construction Real Estate Retail | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  | $ 705,000 |
PPP loans receivable |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 0 | 0 |
Bank Overdrafts |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 0 | 0 |
consumer less GFSC and check loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 89 | 131 |
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification | $ 555,000 | $ 533,000 |
consumer less GFSC and check loans | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification | 196,000 | 116,000 |
consumer less GFSC and check loans | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification | $ 359,000 | $ 417,000 |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts |  |  | 214
Total Recorded Investment Modified as TDRs During Period |  |  | $ 852,000
Consumer Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | 218,000
Consumer Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | $ 634,000

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