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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | $ 7,278,546 | $ 6,501,404
Accrued interest receivable |  | 26,492 | 24,217
Recorded Investment |  | 7,301,181 | 6,520,625
Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 245,288 | 233,637
Accrued interest receivable |  | 710 | 826
Recorded Investment |  | 245,998 | 234,463
Construction Real Estate - Mortgage [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 112,648 | 96,574
Accrued interest receivable |  | 249 | 228
Recorded Investment |  | 112,897 | 96,802
Construction Real Estate - Installment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 1,060 | 1,488
Accrued interest receivable |  | 5 | 4
Recorded Investment |  | 1,065 | 1,492
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 501,608 | 479,081
Accrued interest receivable |  | 1,173 | 1,339
Recorded Investment |  | 502,781 | 480,420
Residential Real Estate - Mortgage [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 1,117,534 | 1,176,316
Accrued interest receivable |  | 1,519 | 1,381
Recorded Investment |  | 1,119,053 | 1,177,697
Residential Real Estate - HELOC [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 194,342 | 224,766
Accrued interest receivable |  | 671 | 1,113
Recorded Investment |  | 195,013 | 225,879
Residential Real Estate - Installment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 9,425 | 12,563
Accrued interest receivable |  | 26 | 32
Recorded Investment |  | 9,451 | 12,595
Loans Receivable [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Accrued interest receivable |  | 22,635 | 19,221
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance | [1] | 1,727,016 | 1,185,110
Accrued interest receivable | [1] | 6,934 | 4,393
Recorded Investment | [1] | 1,733,950 | 1,189,503
Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance | [1] | 1,689,477 | 1,609,413
Accrued interest receivable | [1] | 6,811 | 5,571
Recorded Investment | [1] | 1,696,288 | 1,614,984
Consumer [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 1,652,638 | 1,452,375
Accrued interest receivable |  | 4,515 | 4,314
Recorded Investment |  | 1,657,153 | 1,456,689
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loan balance |  | 27,510 | 30,081
Accrued interest receivable |  | 22 | 20
Recorded Investment |  | $ 27,532 | $ 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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