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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 ContractsRecorded InvestmentNumber of ContractsRecorded InvestmentNumber of ContractsRecorded Investment
Commercial, financial and agricultural1  $20  3  $104  —  $—  
Commercial real estate—  —  —  —  2  82  
Construction real estate:
Commercial—  —  —  —  —  —  
Mortgage—  —  —  —  —  —  
Installment—  —  —  —  —  —  
Residential real estate:
Commercial—  —  —  —  2  117  
Mortgage7  665  8  518  6  467  
HELOC6  141  2  32  4  194  
Installment—  —  1  29  —  —  
Consumer56  539  59  636  50  375  
Leases—  —  —  —  —  —  
Total loans70  $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