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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment $ 1,207 $ 684
Allowance for loan losses collectively evaluated for impairment 47,762 49,304
Total ending allowance balance 48,969 49,988
Loans individually evaluated for impairment 50,292 56,545
Loans collectively evaluated for impairment 5,242,057 5,315,938
Total ending loan balance, net of accrued interest receivable $ 5,292,349 $ 5,372,483
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 2.39998% 1.20966%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.91113% 0.92748%
Total ending allowance for loan losses balance as a percentage of loan balance 0.92528% 0.93045%
Recorded investment $ 50,322 $ 56,564
Recorded investment collectively evaluated for impairment 5,257,653 5,332,578
Recorded Investment 5,307,975 5,389,142
Commercial Financial And Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 1,165 681
Allowance for loan losses collectively evaluated for impairment 12,912 14,341
Total ending allowance balance 14,077 15,022
Loans individually evaluated for impairment 27,045 18,034
Loans collectively evaluated for impairment 973,741 1,035,419
Total ending loan balance, net of accrued interest receivable [1] $ 1,000,786 $ 1,053,453
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 4.30764% 3.7762%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.32602% 1.38504%
Total ending allowance for loan losses balance as a percentage of loan balance 1.40659% 1.42598%
Recorded investment $ 27,050 $ 18,039
Recorded investment collectively evaluated for impairment 977,979 1,039,827
Recorded Investment [1] 1,005,029 1,057,866
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 29 2
Allowance for loan losses collectively evaluated for impairment 9,459 9,599
Total ending allowance balance 9,488 9,601
Loans individually evaluated for impairment 18,960 18,131
Loans collectively evaluated for impairment 1,137,603 1,149,476
Total ending loan balance, net of accrued interest receivable [1] $ 1,156,563 $ 1,167,607
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.15295% 0.01103%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.83149% 0.83508%
Total ending allowance for loan losses balance as a percentage of loan balance 0.82036% 0.82228%
Recorded investment $ 18,983 $ 18,142
Recorded investment collectively evaluated for impairment 1,141,627 1,153,748
Recorded Investment [1] 1,160,610 1,171,890
Construction Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 8 0
Allowance for loan losses collectively evaluated for impairment 4,455 4,430
Total ending allowance balance 4,463 4,430
Loans individually evaluated for impairment 1,391 1,322
Loans collectively evaluated for impairment 179,793 180,148
Total ending loan balance, net of accrued interest receivable $ 181,184 $ 181,470
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.57513% 0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 2.47785% 2.45909%
Total ending allowance for loan losses balance as a percentage of loan balance 2.46324% 2.44117%
Recorded investment $ 1,393 $ 1,324
Recorded investment collectively evaluated for impairment 180,296 180,693
Recorded Investment 181,689 182,017
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 5 1
Allowance for loan losses collectively evaluated for impairment 9,410 9,320
Total ending allowance balance 9,415 9,321
Loans individually evaluated for impairment 2,896 19,058
Loans collectively evaluated for impairment 1,695,764 1,706,166
Total ending loan balance, net of accrued interest receivable $ 1,698,660 $ 1,725,224
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.17265% 0.00525%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.55491% 0.54625%
Total ending allowance for loan losses balance as a percentage of loan balance 0.55426% 0.54028%
Recorded investment $ 2,896 $ 19,059
Recorded investment collectively evaluated for impairment 1,699,087 1,709,737
Recorded Investment 1,701,983 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 11,526 11,614
Total ending allowance balance 11,526 11,614
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 1,252,251 1,241,736
Total ending loan balance, net of accrued interest receivable $ 1,252,251 $ 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 0.92042% 0.9353%
Total ending allowance for loan losses balance as a percentage of loan balance 0.92042% 0.9353%
Recorded investment $ 0 $ 0
Recorded investment collectively evaluated for impairment 1,255,713 1,245,544
Recorded Investment 1,255,713 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 2,905 2,993
Total ending loan balance, net of accrued interest receivable $ 2,905 $ 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 2,951 3,029
Recorded Investment $ 2,951 $ 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.