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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment $ 1,846 $ 684
Allowance for loan losses collectively evaluated for impairment 48,400 49,304
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Total ending allowance balance 50,246 49,988
Loans individually evaluated for impairment 46,698 56,545
Loans collectively evaluated for impairment 5,574,131 5,315,938
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 4,494  
Total ending loan balance, net of accrued interest receivable $ 5,625,323 $ 5,372,483
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 3.95306% 1.20966%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.8683% 0.92748%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%  
Total ending allowance for loan losses balance as a percentage of loan balance 0.89321% 0.93045%
Recorded investment $ 46,760 $ 56,564
Recorded investment collectively evaluated for impairment 5,593,179 5,332,578
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 4,494  
Recorded Investment 5,644,433 5,389,142
Commercial Financial And Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 1,716 681
Allowance for loan losses collectively evaluated for impairment 13,299 14,341
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Total ending allowance balance 15,015 15,022
Loans individually evaluated for impairment 16,023 18,034
Loans collectively evaluated for impairment 1,015,072 1,035,419
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 405  
Total ending loan balance, net of accrued interest receivable [1] $ 1,031,500 $ 1,053,453
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 10.71% 3.7762%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.31% 1.38504%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%  
Total ending allowance for loan losses balance as a percentage of loan balance 1.45565% 1.42598%
Recorded investment $ 16,026 $ 18,039
Recorded investment collectively evaluated for impairment 1,020,675 1,039,827
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 405  
Recorded Investment [1] 1,037,106 1,057,866
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 71 2
Allowance for loan losses collectively evaluated for impairment 9,676 9,599
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Total ending allowance balance 9,747 9,601
Loans individually evaluated for impairment 25,747 18,131
Loans collectively evaluated for impairment 1,273,337 1,149,476
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,546  
Total ending loan balance, net of accrued interest receivable [1] $ 1,302,630 $ 1,167,607
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.28% 0.01103%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.76% 0.83508%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%  
Total ending allowance for loan losses balance as a percentage of loan balance 0.74826% 0.82228%
Recorded investment $ 25,805 $ 18,142
Recorded investment collectively evaluated for impairment 1,278,448 1,153,748
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 3,546  
Recorded Investment [1] 1,307,799 1,171,890
Construction Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 0 0
Allowance for loan losses collectively evaluated for impairment 4,595 4,430
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Total ending allowance balance 4,595 4,430
Loans individually evaluated for impairment 2,016 1,322
Loans collectively evaluated for impairment 217,681 180,148
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 499  
Total ending loan balance, net of accrued interest receivable $ 220,196 $ 181,470
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 2.11% 2.45909%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%  
Total ending allowance for loan losses balance as a percentage of loan balance 2.08678% 2.44117%
Recorded investment $ 2,016 $ 1,324
Recorded investment collectively evaluated for impairment 218,321 180,693
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 499  
Recorded Investment 220,836 182,017
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 59 1
Allowance for loan losses collectively evaluated for impairment 9,043 9,320
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Total ending allowance balance 9,102 9,321
Loans individually evaluated for impairment 2,912 19,058
Loans collectively evaluated for impairment 1,778,027 1,706,166
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 44  
Total ending loan balance, net of accrued interest receivable $ 1,780,983 $ 1,725,224
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 2.03% 0.00525%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.51% 0.54625%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%  
Total ending allowance for loan losses balance as a percentage of loan balance 0.51107% 0.54028%
Recorded investment $ 2,913 $ 19,059
Recorded investment collectively evaluated for impairment 1,781,908 1,709,737
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 44  
Recorded Investment 1,784,865 1,728,796
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 0 0
Allowance for loan losses collectively evaluated for impairment 11,787 11,614
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Total ending allowance balance 11,787 11,614
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 1,287,382 1,241,736
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 0  
Total ending loan balance, net of accrued interest receivable $ 1,287,382 $ 1,241,736
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 0.92% 0.9353%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%  
Total ending allowance for loan losses balance as a percentage of loan balance 0.91558% 0.9353%
Recorded investment $ 0 $ 0
Recorded investment collectively evaluated for impairment 1,291,155 1,245,544
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Recorded Investment 1,291,155 1,245,544
Leases [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 0 0
Allowance for loan losses collectively evaluated for impairment 0 0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Total ending allowance balance 0 0
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 2,632 2,993
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 0  
Total ending loan balance, net of accrued interest receivable $ 2,632 $ 2,993
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 0.00% 0.00%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance 0.00%  
Total ending allowance for loan losses balance as a percentage of loan balance 0.00% 0.00%
Recorded investment $ 0 $ 0
Recorded investment collectively evaluated for impairment 2,672 3,029
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0  
Recorded Investment $ 2,672 $ 3,029
[1] Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.