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Loans (Aging Of Past Due Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | $ 14,376 |  | $ 23,652 |
Loan balance |  | 6,908,417 |  | 7,177,785 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 20,354 | [1] | 26,364 | [2]
Impaired Financing Receivable, Recorded Investment, Nonaccrual loans which are current in regards to contractual P&I payments |  | 67,700 |  | 92,600 |
Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 6,873,687 |  | 7,148,422 |
Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 815 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 231,210 |  |  |
Loan balance |  | 231,210 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | [2] |  |  | 39 |
Construction Real Estate Commercial [Domain] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 230,395 |  | 227,524 |
Commercial Financial And Agricultural [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  | 7,372 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | [2] |  |  | 13,968 |
Commercial Financial And Agricultural [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  |  |  | 1,574,177 |
Construction Real Estate - Mortgage [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  | 77 |
Construction Real Estate - Mortgage [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  |  |  | 115,647 |
Construction Real Estate - Installment [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  | 12 |
Construction Real Estate - Installment [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  |  |  | 929 |
Residential Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  | 17 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 527,151 |  |  |
Loan balance |  | 527,151 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 413 | [1] | 493 | [2]
Residential Real Estate Commercial [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 526,738 |  | 526,873 |
Residential Real Estate - Mortgage [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 5,931 |  | 9,538 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,052,093 |  |  |
Loan balance |  | 1,052,093 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 5,884 | [1] | 7,814 | [2]
Residential Real Estate - Mortgage [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,040,278 |  | 1,079,953 |
Residential Real Estate - HELOC [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 487 |  | 805 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 166,454 |  |  |
Loan balance |  | 166,454 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 997 | [1] | 810 | [2]
Residential Real Estate - HELOC [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 164,970 |  | 181,060 |
Residential Real Estate - Installment [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 37 |  | 67 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 6,410 |  |  |
Loan balance |  | 6,410 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 93 | [1] | 71 | [2]
Residential Real Estate - Installment [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 6,280 |  | 8,320 |
PPP loans receivable [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 1 |  |  |
Loan balance |  | 131,483 |  |  |
PPP loans receivable [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 131,482 |  |  |
Bank Overdrafts |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loan balance |  | 4,033 |  |  |
Bank Overdrafts | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 4,033 |  |  |
Construction Real Estate Retail |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 1,202 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 111,677 |  |  |
Loan balance |  | 111,677 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 12 |  |  |
Construction Real Estate Retail | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 110,463 |  |  |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  | 82 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,761,596 |  |  |
Loan balance |  | 1,761,596 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 1,009 | [1] | 972 | [2]
Commercial Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,760,587 |  | 1,753,152 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  | 5,496 |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans | [2] |  |  | 1,213 |
Consumer [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  |  |  | 1,657,505 |
Finance Leases Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 53 |  | 186 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 21,632 |  |  |
Loan balance |  | 21,632 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 576 |  | 984 | [2]
Finance Leases Portfolio Segment [Member] | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 21,003 |  | $ 23,282 |
PPP loans receivable [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 131,483 |  |  |
GFSC loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 196 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 2,624 |  |  |
Loan balance |  | 2,624 |  |  |
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans |  | 57 |  |  |
GFSC loans | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 2,371 |  |  |
Check loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 8 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 2,092 |  |  |
Loan balance |  | 2,092 |  |  |
Check loans | Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 2,084 |  |  |
Bank Overdrafts |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | $ 4,033 |  |  |
[1] | 1) Includes an aggregate of $0.3 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans.(2) Includes an aggregate of $67.7 million of nonaccrual loans which were current in regards to contractual principal and interest payments
[2] | 1) Includes an aggregate of $1.6 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans.(2) Includes an aggregate of $92.6 million of nonaccrual loans which were current in regards to contractual principal and interest payments.

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