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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.