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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment $ 1,396 $ 684
Allowance for loan losses collectively evaluated for impairment 48,056 49,304
Total ending allowance balance 49,452 49,988
Loans individually evaluated for impairment 61,705 56,545
Loans collectively evaluated for impairment 5,263,269 5,315,938
Total ending loan balance, net of accrued interest receivable $ 5,324,974 $ 5,372,483
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 2.26238% 1.20966%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.91304% 0.92748%
Total ending allowance for loan losses balance as a percentage of loan balance 0.92868% 0.93045%
Recorded investment $ 61,750 $ 56,564
Recorded investment collectively evaluated for impairment 5,279,805 5,332,578
Recorded Investment 5,341,555 5,389,142
Commercial Financial And Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 1,366 681
Allowance for loan losses collectively evaluated for impairment 13,112 14,341
Total ending allowance balance 14,478 15,022
Loans individually evaluated for impairment 29,942 18,034
Loans collectively evaluated for impairment 984,681 1,035,419
Total ending loan balance, net of accrued interest receivable [1] $ 1,014,623 $ 1,053,453
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 4.56% 3.7762%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.34% 1.38504%
Total ending allowance for loan losses balance as a percentage of loan balance 1.42693% 1.42598%
Recorded investment $ 29,943 $ 18,039
Recorded investment collectively evaluated for impairment 989,446 1,039,827
Recorded Investment [1] 1,019,389 1,057,866
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 27 2
Allowance for loan losses collectively evaluated for impairment 9,379 9,599
Total ending allowance balance 9,406 9,601
Loans individually evaluated for impairment 26,485 18,131
Loans collectively evaluated for impairment 1,124,360 1,149,476
Total ending loan balance, net of accrued interest receivable [1] $ 1,150,845 $ 1,167,607
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.10% 0.01103%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.83% 0.83508%
Total ending allowance for loan losses balance as a percentage of loan balance 0.81731% 0.82228%
Recorded investment $ 26,528 $ 18,142
Recorded investment collectively evaluated for impairment 1,128,558 1,153,748
Recorded Investment [1] 1,155,086 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 4,652 4,430
Total ending allowance balance 4,652 4,430
Loans individually evaluated for impairment 2,529 1,322
Loans collectively evaluated for impairment 189,389 180,148
Total ending loan balance, net of accrued interest receivable $ 191,918 $ 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 2.45% 2.45909%
Total ending allowance for loan losses balance as a percentage of loan balance 2.42395% 2.44117%
Recorded investment $ 2,529 $ 1,324
Recorded investment collectively evaluated for impairment 189,948 180,693
Recorded Investment 192,477 182,017
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 3 1
Allowance for loan losses collectively evaluated for impairment 9,242 9,320
Total ending allowance balance 9,245 9,321
Loans individually evaluated for impairment 2,749 19,058
Loans collectively evaluated for impairment 1,687,823 1,706,166
Total ending loan balance, net of accrued interest receivable $ 1,690,572 $ 1,725,224
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.11% 0.00525%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.55% 0.54625%
Total ending allowance for loan losses balance as a percentage of loan balance 0.54686% 0.54028%
Recorded investment $ 2,750 $ 19,059
Recorded investment collectively evaluated for impairment 1,691,217 1,709,737
Recorded Investment 1,693,967 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 11,671 11,614
Total ending allowance balance 11,671 11,614
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 1,274,349 1,241,736
Total ending loan balance, net of accrued interest receivable $ 1,274,349 $ 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 0.91% 0.9353%
Total ending allowance for loan losses balance as a percentage of loan balance 0.91584% 0.9353%
Recorded investment $ 0 $ 0
Recorded investment collectively evaluated for impairment 1,277,946 1,245,544
Recorded Investment 1,277,946 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
Total ending allowance balance 0 0
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 2,667 2,993
Total ending loan balance, net of accrued interest receivable $ 2,667 $ 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%
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 2,690 3,029
Recorded Investment $ 2,690 $ 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.