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Loans Schedule of troubled debt restructurings on financing receivables (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) contracts | Dec. 31, 2018 USD ($) contracts | Dec. 31, 2017 USD ($) contracts
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 443 | 392 | 426
Total Recorded Investment Modified as TDRs During Period | $ 26,673,000 | $ 9,191,000 | $ 10,125,000
Troubled Debt Restructuring, Classification removed | 38,000 | 2,400,000 |
TDRs included in nonaccrual loan totals | 34,300,000 | 24,600,000 |
Nonaccrual TDRs considered current | 23,200,000 | 19,200,000 |
TDRs included in accruing loan totals | 21,300,000 | 15,200,000 |
Loans and Leases Receivable, Impaired, Commitment to Lend | 7,900,000 | 300,000 |
Specific Reserves Related To Troubled Debt Restructuring | 2,200,000 | 1,200,000 |
Additional specific reserves related to troubled debt restructuring | 1,300 | 200,000 | 300,000
Modified substandard commercial loans, total recorded investment | 649,000 | 368,000 |
Modified substandard consumer loans total recorded investment | 36,200,000 | 20,900,000 |
Acquired financing receivable with deteriorated credit quality not TDR | 440,000 | 0 |
Nonaccrual loans not classified as TDRs at prior fiscal year end | $ 2,100,000 | $ 500,000 | $ 1,800,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 70 | 73 | 64
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 1,365,000 | $ 1,319,000 | $ 1,235,000
Schedule Of Financing Receivable, Loans Modified As T D R Within Previous Twelve Months That Subsequently Defaulted [Table text Block] | The following table presents the recorded investment in financing receivables which were modified as TDRs within the previous 12 months and for which there was a payment default during the year ended December 31, 2019, December 31, 2018, and December 31, 2017. For this table, a loan is considered to be in default when it becomes 30 days contractually past due under the modified terms. The additional allowance for loan loss resulting from the defaults on TDR loans was immaterial.
|  | Year ended December 31, 2019 |  |  |  | Year ended December 31, 2018 |  |  |  | Year ended December 31, 2017 |  |
(In thousands) |  | Number of Contracts |  | Recorded Investment |  | Number of Contracts |  | Recorded Investment |  | Number of Contracts |  | Recorded Investment
Commercial, financial and agricultural |  | 1 |  |  | $ | 20 |  |  | 3 |  |  | $ | 104 |  |  | — |  |  | $ | — |
Commercial real estate |  | — |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 82 |
Construction real estate: |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Mortgage |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Installment |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Residential real estate: |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | — |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 117 |
Mortgage |  | 7 |  |  | 665 |  |  | 8 |  |  | 518 |  |  | 6 |  |  | 467 |
HELOC |  | 6 |  |  | 141 |  |  | 2 |  |  | 32 |  |  | 4 |  |  | 194 |
Installment |  | — |  |  | — |  |  | 1 |  |  | 29 |  |  | — |  |  | — |
Consumer |  | 56 |  |  | 539 |  |  | 59 |  |  | 636 |  |  | 50 |  |  | 375 |
Leases |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total loans |  | 70 |  |  | $ | 1,365 |  |  | $ | 73 |  |  | $ | 1,319 |  |  | 64 |  |  | $ | 1,235 |
Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 8,465,000 | 2,569,000 | 3,923,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 350,000 | 86,000 | 180,000
Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 18,208,000 | 6,622,000 | 6,202,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 1,000,000.0 | $ 1,200,000 | $ 1,100,000
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 30 | 21 | 29
Total Recorded Investment Modified as TDRs During Period | $ 13,861,000 | $ 857,000 | $ 3,715,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 1 | 3 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 20,000 | $ 104,000 |
Commercial Financial And Agricultural [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 6,040,000 | 28,000 | $ 945,000
Commercial Financial And Agricultural [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 7,821,000 | $ 829,000 | $ 2,770,000
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 8 | 17 | 9
Total Recorded Investment Modified as TDRs During Period | $ 8,270,000 | $ 3,586,000 | $ 1,363,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  |  | $ 82,000
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 | 1,050,000
Commercial Real Estate Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 7,855,000 | $ 3,172,000 | $ 313,000
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 3 | 1 | 0
Total Recorded Investment Modified as TDRs During Period | $ 415,000 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 0
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 | 2 | 0 | 1
Total Recorded Investment Modified as TDRs During Period | $ 77,000 |  | $ 8,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 |  |
Construction Real Estate Mortgage [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 77,000 | $ 0 | $ 0
Construction Real Estate Mortgage [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | $ 8,000
Construction Real Estate Installment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 0 | 2 | 0
Total Recorded Investment Modified as TDRs During Period |  | $ 10,000 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 |  |
Construction Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 0 | $ 10,000 | $ 0
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 3 | 3 | 15
Total Recorded Investment Modified as TDRs During Period | $ 100,000 | $ 417,000 | $ 630,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  |  | $ 117,000
Residential Real Estate Commercial [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  | $ 54,000 | 144,000
Residential Real Estate Commercial [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 100,000 | $ 363,000 | $ 486,000
Residential Real Estate Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 21 | 25 | 33
Total Recorded Investment Modified as TDRs During Period | $ 1,124,000 | $ 1,696,000 | $ 2,247,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 7 | 8 | 6
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 665,000 | $ 518,000 | $ 467,000
Residential Real Estate Mortgage [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 535,000 | 842,000 | 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 | $ 589,000 | $ 854,000 | $ 1,359,000
Residential Real Estate Home Equity Line Of Credit [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 18 | 21 | 19
Total Recorded Investment Modified as TDRs During Period | $ 360,000 | $ 644,000 | $ 576,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 6 | 2 | 4
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 141,000 | $ 32,000 | $ 194,000
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 | 126,000 | 558,000 | 474,000
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 | $ 234,000 | $ 86,000 | $ 102,000
Residential Real Estate Installment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 34 | 19 | 11
Total Recorded Investment Modified as TDRs During Period | $ 1,075,000 | $ 528,000 | $ 294,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 1 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 | $ 29,000 |
Residential Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 1,047,000 | 459,000 | $ 251,000
Residential Real Estate Installment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 28,000 | $ 69,000 | $ 43,000
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contracts | 324 | 283 | 309
Total Recorded Investment Modified as TDRs During Period | $ 1,391,000 | $ 1,453,000 | $ 1,292,000
Consumer Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 225,000 | 204,000 | 171,000
Consumer Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 1,166,000 | $ 1,249,000 | $ 1,121,000
Consumer Loan [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 56 | 59 | 50
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 539,000 | $ 636,000 | $ 375,000
Leases |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 |  |

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