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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | $ 6,908,417 |  | $ 7,177,785 |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (88,129) | $ (83,577) | (85,675) |  | $ (87,038) | $ (73,476) | $ (56,679)
Loans and Leases Receivable, Net Amount |  | 6,820,288 |  | 7,092,110 |  |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  | 18,400 |  | 20,653 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 7,198,438 |  |  |  |
Construction Real Estate Commercial [Domain] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 231,210 |  | 226,991 |  |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 572 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 227,563 |  |  |  |
Construction Real Estate Retail |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 111,677 |  | 116,430 |  |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 235 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 116,665 |  |  |  |
Construction Real Estate - Installment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 941 |  |  |  |
Residential Real Estate Commercial [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 527,151 |  | 526,222 |  |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 1,161 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 527,383 |  |  |  |
Residential Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 1,052,093 |  | 1,096,358 |  |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 947 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 1,097,305 |  |  |  |
Residential Real Estate - HELOC [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 166,454 |  | 182,028 |  |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 647 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 182,675 |  |  |  |
Residential Real Estate - Installment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 6,410 |  | 8,436 |  |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 22 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 8,458 |  |  |  |
Commercial, Financial, and Agricultural [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 1,595,517 |  |  |  |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 1,314,870 |  | 1,588,989 | [1] |  |  |
Financing Receivable, Allowance for Credit Loss |  | (15,976) | (15,222) | (25,608) |  | (26,987) | (23,476) | (20,203)
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 6,528 |  |  |  |
Loans and Leases Receivable, Recorded Investment | [1] |  |  | 1,595,517 |  |  |  |
PPP loans receivable [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 131,483 |  |  |  |  |  |
Bank Overdrafts |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 4,033 |  |  |  |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance | [1] | 1,761,596 |  | 1,748,189 |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (26,168) | (22,749) | (23,480) |  | (22,888) | (16,469) | (10,229)
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 6,017 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 1,754,206 |  |  |  |
Consumer [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 1,715,324 |  | 1,659,704 |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (27,659) | (26,261) | (17,418) |  | (16,969) | (15,624) | (12,211)
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 4,510 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | 1,664,214 |  |  |  |
GFSC loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 2,624 |  |  |  |  |  |
Check loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 2,092 |  |  |  |  |  |
Finance Leases Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 21,632 |  | 24,438 |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (300) | $ (562) | (518) |  | $ (579) | $ (572) | $ (115)
Financing Receivable, Accrued Interest, before Allowance for Credit Loss |  |  |  | 14 |  |  |  |
Loans and Leases Receivable, Recorded Investment |  |  |  | $ 24,452 |  |  |  |
Consumer less GFSC and Check Loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | 1,710,608 |  |  |  |  |  |
Commercial Financial Agricultural less PPP and Overdrafts |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loan balance |  | $ 1,179,354 |  |  |  |  |  |
[1] | Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.(2) Results for reporting periods beginning after January 1, 2021 are presented under ASC 326, while prior period amounts continue to be reported in accordance with previously applicable U.S. GAAP. Category was not broken out as a separate class at December 31, 2020.

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