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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance $ 7,093,857 $ 7,141,891    
Financing Receivable, Allowance for Credit Loss (85,946) (85,379) $ (78,861) $ (83,197)
Loans and Leases Receivable, Net Amount 7,007,911 7,056,512    
Construction Real Estate Commercial [Domain]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 173,668 208,982    
Residential Real Estate Commercial [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 562,759 550,183    
Residential Real Estate - Mortgage [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 1,089,772 1,075,446    
Residential Real Estate - HELOC [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 164,656 167,151    
Residential Real Estate - Installment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 3,987 4,091    
Commercial Financial And Agricultural [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 1,261,981 1,300,933    
Financing Receivable, Allowance for Credit Loss (16,572) (16,987) (13,288) (14,025)
PPP loans receivable [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 3,445 4,206    
Bank Overdrafts        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 1,831 1,489    
Commercial Real Estate [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance [1] 1,800,878 1,794,054    
Financing Receivable, Allowance for Credit Loss (17,946) (17,829) (23,731) (25,466)
GFSC loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 140 274    
Check loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 2,071 2,150    
Finance Leases Portfolio Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 18,472 19,637    
Financing Receivable, Allowance for Credit Loss (124) (161) $ (231) $ (238)
Consumer less GFSC and Check Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance 1,898,398 1,902,557    
Commercial Financial Agricultural less PPP and Overdrafts        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan balance $ 1,256,705 $ 1,295,238    
[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.