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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance $ 7,204,445 $ 6,501,404
Accrued interest receivable 26,299 24,217
Recorded Investment 7,226,312 6,520,625
Construction Real Estate Commercial [Domain]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 245,339 233,637
Accrued interest receivable 792 826
Recorded Investment 246,131 234,463
Construction Real Estate - Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 105,489 96,574
Accrued interest receivable 261 228
Recorded Investment 105,750 96,802
Construction Real Estate - Installment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 1,156 1,488
Accrued interest receivable 4 4
Recorded Investment 1,160 1,492
Residential Real Estate Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 498,697 479,081
Accrued interest receivable 1,311 1,339
Recorded Investment 500,008 480,420
Residential Real Estate - Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 1,234,017 1,176,316
Accrued interest receivable 1,951 1,381
Recorded Investment 1,235,968 1,177,697
Residential Real Estate - HELOC [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 204,442 224,766
Accrued interest receivable 740 1,113
Recorded Investment 205,182 225,879
Residential Real Estate - Installment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 10,718 12,563
Accrued interest receivable 32 32
Recorded Investment 10,750 12,595
Loans Receivable [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Accrued interest receivable 21,867 19,221
Commercial Financial And Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance [1] 1,736,696 1,185,110
Accrued interest receivable [1] 5,313 4,393
Recorded Investment [1] 1,742,009 1,189,503
Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance [1] 1,632,625 1,609,413
Accrued interest receivable [1] 6,830 5,571
Recorded Investment [1] 1,639,455 1,614,984
Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 1,506,434 1,452,375
Accrued interest receivable 4,620 4,314
Recorded Investment 1,511,054 1,456,689
Finance Leases Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loan balance 28,832 30,081
Accrued interest receivable 13 20
Recorded Investment $ 28,845 $ 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.