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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | $ 6,522,519 | $ 6,501,404
Accrued interest receivable |  | 23,406 | 24,217
Recorded Investment |  | 6,541,548 | 6,520,625
Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 232,327 | 233,637
Accrued interest receivable |  | 722 | 826
Recorded Investment |  | 233,049 | 234,463
Construction Real Estate - Mortgage [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 101,401 | 96,574
Accrued interest receivable |  | 243 | 228
Recorded Investment |  | 101,644 | 96,802
Construction Real Estate - Installment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 1,350 | 1,488
Accrued interest receivable |  | 5 | 4
Recorded Investment |  | 1,355 | 1,492
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 466,002 | 479,081
Accrued interest receivable |  | 1,187 | 1,339
Recorded Investment |  | 467,189 | 480,420
Residential Real Estate - Mortgage [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 1,178,621 | 1,176,316
Accrued interest receivable |  | 1,490 | 1,381
Recorded Investment |  | 1,180,111 | 1,177,697
Residential Real Estate - HELOC [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 220,571 | 224,766
Accrued interest receivable |  | 934 | 1,113
Recorded Investment |  | 221,505 | 225,879
Residential Real Estate - Installment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 11,775 | 12,563
Accrued interest receivable |  | 31 | 32
Recorded Investment |  | 11,806 | 12,595
Loans Receivable [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Accrued interest receivable |  | 19,029 | 19,221
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance | [1] | 1,202,857 | 1,185,110
Accrued interest receivable | [1] | 4,577 | 4,393
Recorded Investment | [1] | 1,207,434 | 1,189,503
Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance | [1] | 1,627,426 | 1,609,413
Accrued interest receivable | [1] | 5,617 | 5,571
Recorded Investment | [1] | 1,633,043 | 1,614,984
Consumer [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 1,451,297 | 1,452,375
Accrued interest receivable |  | 4,206 | 4,314
Recorded Investment |  | 1,455,503 | 1,456,689
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 28,892 | 30,081
Accrued interest receivable |  | 17 | 20
Recorded Investment |  | $ 28,909 | $ 30,101
[1] | Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

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