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Loans - Schedule of recorded investment in nonaccrual restructured and loans 90 days past due and accruing (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | $ 117,368 | $ 90,080
Restructured Loans | 20,888 | 21,298
Financing Receivable, 90 Days or More Past Due, Still Accruing | 1,594 | 2,737
Financing Receivable Recorded Investment Nonperforming | 139,850 | 114,115
Commercial Financial And Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 23,261 | 26,776
Restructured Loans | 5,619 | 6,349
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 28
Financing Receivable Recorded Investment Nonperforming | 28,880 | 33,153
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 67,426 | 39,711
Restructured Loans | 2,931 | 2,080
Financing Receivable, 90 Days or More Past Due, Still Accruing | 377 | 625
Financing Receivable Recorded Investment Nonperforming | 70,734 | 42,416
Construction Real Estate Remaining Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 3,110 | 453
Restructured Loans | 0 | 0
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Financing Receivable Recorded Investment Nonperforming | 3,110 | 453
Construction Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 0 | 25
Restructured Loans | 30 | 84
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Financing Receivable Recorded Investment Nonperforming | 30 | 109
Construction Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 14 | 72
Restructured Loans | 1 | 5
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Financing Receivable Recorded Investment Nonperforming | 15 | 77
Residential Real Estate Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 4,304 | 2,025
Restructured Loans | 253 | 0
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Financing Receivable Recorded Investment Nonperforming | 4,557 | 2,025
Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 14,016 | 15,271
Restructured Loans | 8,400 | 8,826
Financing Receivable, 90 Days or More Past Due, Still Accruing | 416 | 1,209
Financing Receivable Recorded Investment Nonperforming | 22,832 | 25,306
Residential Real Estate Home Equity Line Of Credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 1,286 | 2,062
Restructured Loans | 909 | 1,010
Financing Receivable, 90 Days or More Past Due, Still Accruing | 77 | 44
Financing Receivable Recorded Investment Nonperforming | 2,272 | 3,116
Residential Real Estate Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 184 | 462
Restructured Loans | 1,728 | 1,964
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Financing Receivable Recorded Investment Nonperforming | 1,912 | 2,426
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 2,172 | 3,089
Restructured Loans | 1,017 | 980
Financing Receivable, 90 Days or More Past Due, Still Accruing | 724 | 645
Financing Receivable Recorded Investment Nonperforming | 3,913 | 4,714
Leases |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Nonaccrual | 1,595 | 134
Restructured Loans | 0 | 0
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 186
Financing Receivable Recorded Investment Nonperforming | $ 1,595 | $ 320

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- Definition Reflects the recorded investment in nonaccrual loans, renegotiated loans not currently on nonaccrual, and loans which are contractually past due 90 days or more but whose interest continues to accrue. + References No definition available. + Details
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