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Loans Schedule of troubled debt restructurings on financing receivables (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) contracts | Dec. 31, 2019 USD ($) contracts | Dec. 31, 2018 USD ($) contracts
Financing Receivable, Impaired [Line Items] |  |  |
Troubled Debt Restructuring, Classification removed | $ 2,300,000 | $ 38,000 |
TDRs included in nonaccrual loan totals | 25,800,000 | 34,300,000 |
Nonaccrual TDRs considered current | 12,900,000 | 23,200,000 |
TDRs included in accruing loan totals | 20,900,000 | 21,300,000 |
Loans and Leases Receivable, Impaired, Commitment to Lend | 6,700,000 | 7,900,000 |
Specific Reserves Related To Troubled Debt Restructuring | 200,000 | 2,200,000 |
Additional specific reserves related to troubled debt restructuring | 7,000 | 1,300 | $ 200,000
Modified substandard commercial loans, total recorded investment | 200,000 | 600,000 |
Modified substandard consumer loans total recorded investment | 57,900,000 | 36,200,000 |
Nonaccrual loans not classified as TDRs at prior fiscal year end | $ 400,000 | $ 2,100,000 | $ 500,000
Financing Receivable, Modifications, Number of Contracts | contracts | 292 | 443 | 392
Total Recorded Investment Modified as TDRs During Period | $ 10,346,000 | $ 26,673,000 | $ 9,191,000
Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 1,569,000 | 8,465,000 | 2,569,000
Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 8,777,000 | $ 18,208,000 | $ 6,622,000
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 12 | 30 | 21
Total Recorded Investment Modified as TDRs During Period | $ 3,813,000 | $ 13,861,000 | $ 857,000
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 | 6,040,000 | 28,000
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 | $ 7,821,000 | $ 829,000
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 9 | 8 | 17
Total Recorded Investment Modified as TDRs During Period | $ 3,235,000 | $ 8,270,000 | $ 3,586,000
Commercial Real Estate Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  | 415,000 | 414,000
Commercial Real Estate Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 3,235,000 | $ 7,855,000 | $ 3,172,000
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 0 | 3 | 1
Total Recorded Investment Modified as TDRs During Period |  | $ 415,000 |
Construction Real Estate Remaining Commercial [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  | $ 415,000 |
Construction Real Estate Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 1 | 2 | 0
Total Recorded Investment Modified as TDRs During Period | $ 26,000 | $ 77,000 |
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 | $ 77,000 | $ 0
Construction Real Estate Installment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 1 | 0 | 2
Total Recorded Investment Modified as TDRs During Period | $ 14,000 |  | $ 10,000
Construction Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 0 | $ 0 | $ 10,000
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 | 3 | 3 | 3
Total Recorded Investment Modified as TDRs During Period | $ 156,000 | $ 100,000 | $ 417,000
Residential Real Estate Commercial [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 153,000 |  | 54,000
Residential Real Estate Commercial [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 3,000 | $ 100,000 | $ 363,000
Residential Real Estate Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 27 | 21 | 25
Total Recorded Investment Modified as TDRs During Period | $ 1,956,000 | $ 1,124,000 | $ 1,696,000
Residential Real Estate Mortgage [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 888,000 | 535,000 | 842,000
Residential Real Estate Mortgage [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 1,068,000 | $ 589,000 | $ 854,000
Residential Real Estate Home Equity Line Of Credit [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 7 | 18 | 21
Total Recorded Investment Modified as TDRs During Period | $ 66,000 | $ 360,000 | $ 644,000
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 | 14,000 | 126,000 | 558,000
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 | $ 52,000 | $ 234,000 | $ 86,000
Residential Real Estate Installment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 18 | 34 | 19
Total Recorded Investment Modified as TDRs During Period | $ 228,000 | $ 1,075,000 | $ 528,000
Residential Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 163,000 | 1,047,000 | 459,000
Residential Real Estate Installment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 65,000 | $ 28,000 | $ 69,000
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 214 | 324 | 283
Total Recorded Investment Modified as TDRs During Period | $ 852,000 | $ 1,391,000 | $ 1,453,000
Consumer Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 218,000 | 225,000 | 204,000
Consumer Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 634,000 | $ 1,166,000 | $ 1,249,000

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