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Allowance For Credit Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 3,422,000   $ 3,566,000      
Allowance for loan losses collectively evaluated for impairment 81,180,000   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 84,602,000 $ 87,206,000 85,379,000 $ 83,961,000 $ 81,448,000 $ 83,197,000
Loans individually evaluated for impairment 40,839,000   78,341,000      
Loans collectively evaluated for impairment 7,305,099,000   7,058,897,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,807,000   4,653,000      
Total ending loan balance, net of accrued interest receivable $ 7,349,745,000   $ 7,141,891,000      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 8.38%   4.55%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.11%   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 1.15%   1.20%      
Commercial Financial And Agricultural [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 3,122,000   $ 3,426,000      
Allowance for loan losses collectively evaluated for impairment 11,846,000   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 14,968,000 16,278,000 16,987,000 12,877,000 12,747,000 14,025,000
Loans individually evaluated for impairment 17,257,000   41,307,000      
Loans collectively evaluated for impairment 1,271,722,000   1,259,524,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 42,000   102,000      
Total ending loan balance, net of accrued interest receivable $ 1,289,021,000   $ 1,300,933,000      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 18.09%   8.29%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.93%   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 1.16%   1.31%      
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 205,000   $ 131,000      
Allowance for loan losses collectively evaluated for impairment 18,413,000   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 18,618,000 19,141,000 17,829,000 20,722,000 22,339,000 25,466,000
Loans individually evaluated for impairment 19,869,000   32,423,000      
Loans collectively evaluated for impairment 1,810,736,000   1,758,118,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 2,795,000   3,513,000      
Total ending loan balance, net of accrued interest receivable [1] $ 1,833,400,000   $ 1,794,054,000      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 1.03%   0.40%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.02%   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 1.02%   0.99%      
Construction Real Estate [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 95,000   $ 0      
Allowance for loan losses collectively evaluated for impairment 5,204,000   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 5,299,000 4,886,000 5,550,000 4,498,000 4,391,000 5,758,000
Loans individually evaluated for impairment 1,124,000   1,712,000      
Loans collectively evaluated for impairment 287,165,000   323,043,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 637,000   660,000      
Total ending loan balance, net of accrued interest receivable $ 288,926,000   $ 325,415,000      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 8.45%   0.00%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.81%   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 1.83%   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 16,989,000   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 16,989,000 18,419,000 16,831,000 15,103,000 13,619,000 11,424,000
Loans individually evaluated for impairment 2,237,000   2,191,000      
Loans collectively evaluated for impairment 1,944,776,000   1,794,302,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 333,000   378,000      
Total ending loan balance, net of accrued interest receivable $ 1,947,346,000   $ 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 0.87%   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 0.87%   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 28,620,000   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 28,620,000 28,370,000 28,021,000 30,563,000 28,149,000 26,286,000
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 1,972,623,000   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 $ 1,972,623,000   $ 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 1.45%   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 1.45%   1.47%      
Finance Leases Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 0   $ 9,000      
Allowance for loan losses collectively evaluated for impairment 108,000   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 108,000 $ 112,000 161,000 $ 198,000 $ 203,000 $ 238,000
Loans individually evaluated for impairment 352,000   708,000      
Loans collectively evaluated for impairment 18,077,000   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 $ 18,429,000   $ 19,637,000      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.00%   1.27%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.60%   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 0.59%   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.