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Allowance For Credit Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 3,466   $ 5,434      
Allowance for loan losses collectively evaluated for impairment 84,663   80,074      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0   167      
Total ending allowance balance 88,129 $ 83,577 85,675 $ 87,038 $ 73,476 $ 56,679
Loans individually evaluated for impairment 79,264   108,407      
Loans collectively evaluated for impairment 6,820,448   7,058,225      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 8,705   11,153      
Total ending loan balance, net of accrued interest receivable $ 6,908,417   $ 7,177,785      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 4.37%   5.01%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.24%   1.13%      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%   1.50%      
Total ending allowance for loan losses balance as a percentage of loan balance 1.28%   1.19%      
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment     $ 108,455      
Recorded investment collectively evaluated for impairment     7,078,699      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net     11,284      
Recorded Investment     7,198,438      
Commercial Financial And Agricultural [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 3,183   3,758      
Allowance for loan losses collectively evaluated for impairment 12,793   21,809      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0   41      
Total ending allowance balance 15,976 15,222 25,608 26,987 23,476 20,203
Loans individually evaluated for impairment 22,018   28,811      
Loans collectively evaluated for impairment 1,292,601   1,559,842      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 251   336      
Total ending loan balance, net of accrued interest receivable $ 1,314,870   $ 1,588,989 [1]      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 14.46%   13.04%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.99%   1.40%      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%   12.20%      
Total ending allowance for loan losses balance as a percentage of loan balance 1.22%   1.61%      
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment     $ 28,836      
Recorded investment collectively evaluated for impairment     1,566,344      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net     337      
Recorded Investment [1]     1,595,517      
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 180   1,316      
Allowance for loan losses collectively evaluated for impairment 25,988   22,093      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0   71      
Total ending allowance balance 26,168 22,749 23,480 22,888 16,469 10,229
Loans individually evaluated for impairment 50,541   70,334      
Loans collectively evaluated for impairment 1,704,527   1,670,510      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 6,528   7,345      
Total ending loan balance, net of accrued interest receivable [1] $ 1,761,596   $ 1,748,189      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.36%   1.87%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.52%   1.32%      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%   0.97%      
Total ending allowance for loan losses balance as a percentage of loan balance 1.49%   1.34%      
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment     $ 70,357      
Recorded investment collectively evaluated for impairment     1,676,388      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net     7,461      
Recorded Investment     1,754,206      
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 6,264   7,288      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0   0      
Total ending allowance balance 6,264 5,670 7,288 8,407 6,828 5,311
Loans individually evaluated for impairment 442   3,110      
Loans collectively evaluated for impairment 341,480   339,312      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 965   999      
Total ending loan balance, net of accrued interest receivable $ 342,887   $ 343,421      
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 1.83%   2.15%      
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%   2.12%      
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment     $ 3,110      
Recorded investment collectively evaluated for impairment     340,116      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net     1,002      
Recorded Investment     344,228      
Residential Real Estate [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 0   16      
Allowance for loan losses collectively evaluated for impairment 11,762   11,292      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0   55      
Total ending allowance balance 11,762 13,113 11,363 11,208 10,507 8,610
Loans individually evaluated for impairment 4,857   4,557      
Loans collectively evaluated for impairment 1,746,339   1,806,126      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 912   2,361      
Total ending loan balance, net of accrued interest receivable $ 1,752,108   $ 1,813,044      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.00%   0.35%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.67%   0.63%      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%   2.33%      
Total ending allowance for loan losses balance as a percentage of loan balance 0.67%   0.63%      
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment     $ 4,557      
Recorded investment collectively evaluated for impairment     1,808,892      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net     2,372      
Recorded Investment     1,815,821      
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 27,659   17,418      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0   0      
Total ending allowance balance 27,659 26,261 17,418 16,969 15,624 12,211
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 1,715,324   1,659,704      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 0   0      
Total ending loan balance, net of accrued interest receivable $ 1,715,324   $ 1,659,704      
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 1.61%   1.05%      
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 1.61%   1.05%      
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment     $ 0      
Recorded investment collectively evaluated for impairment     1,664,214      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net     0      
Recorded Investment     1,664,214      
Finance Leases Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 103   344      
Allowance for loan losses collectively evaluated for impairment 197   174      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0   0      
Total ending allowance balance 300 $ 562 518 $ 579 $ 572 $ 115
Loans individually evaluated for impairment 1,406   1,595      
Loans collectively evaluated for impairment 20,177   22,731      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 49   112      
Total ending loan balance, net of accrued interest receivable $ 21,632   $ 24,438      
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 7.33%   21.57%      
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.98%   0.77%      
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 1.39%   2.12%      
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment     $ 1,595      
Recorded investment collectively evaluated for impairment     22,745      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net     112      
Recorded Investment     $ 24,452      
[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.(2) Results for reporting periods beginning after January 1, 2021 are presented under ASC 326, while prior period amounts continue to be reported in accordance with previously applicable U.S. GAAP. Category was not broken out as a separate class at December 31, 2020.