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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance $ 7,103,246   $ 6,871,122      
Financing Receivable, Allowance for Credit Loss (83,961) $ (81,448) (83,197) $ (88,129) $ (83,577) $ (85,675)
Loans and Leases Receivable, Net Amount 7,019,285   6,787,925      
Construction Real Estate Commercial [Domain]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 200,580   214,561      
Residential Real Estate Commercial [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 532,921   533,802      
Residential Real Estate - Mortgage [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 1,057,204   1,033,658      
Residential Real Estate - HELOC [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 166,989   165,605      
Residential Real Estate - Installment [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 4,251   5,642      
Commercial Financial And Agricultural [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 1,277,993   1,298,626      
Financing Receivable, Allowance for Credit Loss (12,877) (12,747) (14,025) (15,976) (15,222) (25,608)
PPP loans receivable [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 5,715   74,420      
Bank Overdrafts            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 1,957   1,127      
Commercial Real Estate [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance [1] 1,790,801   1,801,792      
Financing Receivable, Allowance for Credit Loss (20,722) (22,339) (25,466) (26,168) (22,749) (23,480)
GFSC loans            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 452   1,793      
Check loans            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 2,144   2,093      
Finance Leases Portfolio Segment [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 19,871   20,532      
Financing Receivable, Allowance for Credit Loss (198) $ (203) (238) $ (300) $ (562) $ (518)
Consumer less GFSC and Check Loans            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance 1,938,913   1,685,793      
Commercial Financial Agricultural less PPP and Overdrafts            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loan balance $ 1,270,321   $ 1,223,079      
[1] Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.