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Loans Aging of recorded investment in past due loans (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | $ 17,595 | $ 13,465 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 22,085 | 21,070 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 1,281 | 1,607 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 7,141,891 | 6,871,122 | $ 7,177,785
impaired financing receivable recorded investment nonaccrual loans which are current in contractual P and I payments | 58,900 | 53,300 |
Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 39,680 | 34,535 |
Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 7,102,211 | 6,836,587 |
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due |  | 65 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 1,461 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,794,054 | 1,801,792 |
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,526 |
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,800,266 |
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 751 | 0 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 0 | 0 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 208,982 | 214,561 |
Construction Real Estate Remaining Commercial [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 751 | 0 |
Construction Real Estate Remaining Commercial [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 208,231 | 214,561 |
Construction Real Estate Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due |  | 346 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 660 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 107,225 |
Construction Real Estate Mortgage [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,006 |
Construction Real Estate Mortgage [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 106,219 |
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 519 | 283 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 477 | 438 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 550,183 | 533,802 |
Residential Real Estate Commercial [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 996 | 721 |
Residential Real Estate Commercial [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 549,187 | 533,081 |
Residential Real Estate Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 7,630 | 6,170 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 5,157 | 5,933 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 182 | 372 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,075,446 | 1,033,658 |
Residential Real Estate Mortgage [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 12,787 | 12,103 |
Residential Real Estate Mortgage [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,062,659 | 1,021,555 |
Residential Real Estate Home Equity Line Of Credit [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 832 | 565 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 587 | 1,011 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 7 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 167,151 | 165,605 |
Residential Real Estate Home Equity Line Of Credit [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,419 | 1,576 |
Residential Real Estate Home Equity Line Of Credit [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 165,732 | 164,029 |
Residential Real Estate Installment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 57 | 49 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 4 | 31 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 4,091 | 5,642 |
Residential Real Estate Installment [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 61 | 80 |
Residential Real Estate Installment [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 4,030 | 5,562 |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 703 | 431 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 3,269,591 |  |
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 0 | 60 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 0 | 526 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 19,637 | 20,532 |
Finance Leases Portfolio Segment [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 586 |
Finance Leases Portfolio Segment [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 19,637 | 19,946 |
commercial financial agricultural less PPP and overdraft |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 378 | 2,908 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 9,246 | 9,547 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,295,238 | 1,223,079 |
commercial financial agricultural less PPP and overdraft | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 9,624 | 12,455 |
commercial financial agricultural less PPP and overdraft | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,285,614 | 1,210,624 |
PPP Loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 155 | 242 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 389 | 793 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 389 | 793 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 4,206 | 74,420 |
PPP Loans | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 544 | 1,035 |
PPP Loans | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 3,662 | 73,385 |
Bank Overdrafts |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 0 | 0 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 0 | 0 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,489 | 1,127 |
Bank Overdrafts | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0 |
Bank Overdrafts | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,489 | 1,127 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 737 |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 4,738 |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,794,054 |  |
Commercial Real Estate [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 5,475 |  |
Commercial Real Estate [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,788,579 |  |
Construction Real Estate Retail |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 1,035 |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 523 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 116,433 |  |
Construction Real Estate Retail | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,558 |  |
Construction Real Estate Retail | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 114,875 |  |
Consumer Loan [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 5,451 | 2,614 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 964 | 618 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,902,557 | 1,685,793 |
Consumer Loan [Member] | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 6,415 | 3,232 |
Consumer Loan [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,896,142 | 1,682,561 |
GFSC loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 48 | 153 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 0 | 52 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 11 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 274 | 1,793 |
GFSC loans | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 48 | 205 |
GFSC loans | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 226 | 1,588 |
Check Loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due | 2 | 10 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | 0 | 0 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 2,150 | 2,093 |
Check Loans | Financial Asset, Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 2 | 10 |
Check Loans | Financial Asset, Not Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | $ 2,148 | $ 2,083 |

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