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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.