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Allowance For Credit Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses individually evaluated for impairment $ 4,318,000 $ 3,566,000    
Allowance for loan losses collectively evaluated for impairment 81,628,000 81,813,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 85,946,000 85,379,000 $ 78,861,000 $ 83,197,000
Loans individually evaluated for impairment 59,384,000 78,341,000    
Loans collectively evaluated for impairment 7,029,918,000 7,058,897,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 4,555,000 4,653,000    
Total ending loan balance, net of accrued interest receivable $ 7,093,857,000 $ 7,141,891,000    
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 7.27% 4.55%    
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.16% 1.16%    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00% 0.00%    
Total ending allowance for loan losses balance as a percentage of loan balance 1.21% 1.20%    
Commercial Financial And Agricultural [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses individually evaluated for impairment $ 4,100,000 $ 3,426,000    
Allowance for loan losses collectively evaluated for impairment 12,472,000 13,561,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 16,572,000 16,987,000 13,288,000 14,025,000
Loans individually evaluated for impairment 38,955,000 41,307,000    
Loans collectively evaluated for impairment 1,222,943,000 1,259,524,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 83,000 102,000    
Total ending loan balance, net of accrued interest receivable $ 1,261,981,000 $ 1,300,933,000    
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 10.52% 8.29%    
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.02% 1.08%    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00% 0.00%    
Total ending allowance for loan losses balance as a percentage of loan balance 1.31% 1.31%    
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses individually evaluated for impairment $ 216,000 $ 131,000    
Allowance for loan losses collectively evaluated for impairment 17,730,000 17,698,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 17,946,000 17,829,000 23,731,000 25,466,000
Loans individually evaluated for impairment 15,477,000 32,423,000    
Loans collectively evaluated for impairment 1,781,941,000 1,758,118,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,460,000 3,513,000    
Total ending loan balance, net of accrued interest receivable [1] $ 1,800,878,000 $ 1,794,054,000    
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 1.40% 0.40%    
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.99% 1.01%    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00% 0.00%    
Total ending allowance for loan losses balance as a percentage of loan balance 1.00% 0.99%    
Construction Real Estate [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses individually evaluated for impairment $ 0 $ 0    
Allowance for loan losses collectively evaluated for impairment 5,362,000 5,550,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 5,362,000 5,550,000 4,230,000 5,758,000
Loans individually evaluated for impairment 1,997,000 1,712,000    
Loans collectively evaluated for impairment 288,095,000 323,043,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 651,000 660,000    
Total ending loan balance, net of accrued interest receivable $ 290,743,000 $ 325,415,000    
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.00% 0.00%    
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.86% 1.72%    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00% 0.00%    
Total ending allowance for loan losses balance as a percentage of loan balance 1.84% 1.71%    
Residential Real Estate [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses individually evaluated for impairment $ 0 $ 0    
Allowance for loan losses collectively evaluated for impairment 17,889,000 16,831,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 17,889,000 16,831,000 11,584,000 11,424,000
Loans individually evaluated for impairment 2,338,000 2,191,000    
Loans collectively evaluated for impairment 1,818,475,000 1,794,302,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 361,000 378,000    
Total ending loan balance, net of accrued interest receivable $ 1,821,174,000 $ 1,796,871,000    
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.00% 0.00%    
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.98% 0.94%    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00% 0.00%    
Total ending allowance for loan losses balance as a percentage of loan balance 0.98% 0.94%    
Consumer [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses individually evaluated for impairment $ 0 $ 0    
Allowance for loan losses collectively evaluated for impairment 28,053,000 28,021,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 28,053,000 28,021,000 25,797,000 26,286,000
Loans individually evaluated for impairment 0 0    
Loans collectively evaluated for impairment 1,900,609,000 1,904,981,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 0 0    
Total ending loan balance, net of accrued interest receivable $ 1,900,609,000 $ 1,904,981,000    
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.00% 0.00%    
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.48% 1.47%    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00% 0.00%    
Total ending allowance for loan losses balance as a percentage of loan balance 1.48% 1.47%    
Finance Leases Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses individually evaluated for impairment $ 2,000 $ 9,000    
Allowance for loan losses collectively evaluated for impairment 122,000 152,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 124,000 161,000 $ 231,000 $ 238,000
Loans individually evaluated for impairment 617,000 708,000    
Loans collectively evaluated for impairment 17,855,000 18,929,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 0 0    
Total ending loan balance, net of accrued interest receivable $ 18,472,000 $ 19,637,000    
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.32% 1.27%    
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.68% 0.80%    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00% 0.00%    
Total ending allowance for loan losses balance as a percentage of loan balance 0.67% 0.82%    
[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.