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Loans Schedule of loans individually and collectively evaluated for impairment (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | $ 111,378 | $ 83,176
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 77,491 | 48,144
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 33,887 | 35,032
Commercial Financial And Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 33,125 | 15,194
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 33,088 | 15,120
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 37 | 74
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 41,791 | 28,426
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 41,791 | 28,426
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 0 | 0
Construction Real Estate Remaining Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 453 | 1,866
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 453 | 1,866
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 0 | 0
Construction Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 109 | 15
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 0 | 0
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 109 | 15
Construction Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 77 | 28
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 0 | 0
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 77 | 28
Residential Real Estate Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 2,025 | 2,732
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 2,025 | 2,732
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 0 | 0
Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 24,097 | 25,992
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 0 | 0
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 24,097 | 25,992
Residential Real Estate Home Equity Line Of Credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 3,072 | 3,186
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 0 | 0
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 3,072 | 3,186
Residential Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 2,426 | 1,517
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 0 | 0
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 2,426 | 1,517
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 4,069 | 4,220
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 0 | 0
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | 4,069 | 4,220
Leases |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans | 134 | 0
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Individually Evaluated for Impairment | 134 | 0
Financing Receivable Recorded Investment Nonaccrual And Accruing Restructured Loans, Collectively Evaluated for Impairment | $ 0 | $ 0

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