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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment $ 4,232 $ 4,191
Allowance for loan losses collectively evaluated for impairment 49,330 52,303
Total ending allowance balance 53,562 56,494
Loans individually evaluated for impairment 77,986 80,599
Loans collectively evaluated for impairment 5,109,018 4,987,486
Total ending loan balance, net of accrued interest receivable $ 5,187,004 $ 5,068,085
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 5.42662% 5.19982%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.96555% 1.04868%
Total ending allowance for loan losses balance as a percentage of loan balance 1.03262% 1.1147%
Recorded investment $ 77,998 $ 80,664
Recorded investment collectively evaluated for impairment 5,123,581 5,001,660
Recorded Investment 5,201,579 5,082,324
Commercial Financial And Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 3,191 1,904
Allowance for loan losses collectively evaluated for impairment 13,079 11,790
Total ending allowance balance 16,270 13,694
Loans individually evaluated for impairment 23,852 30,545
Loans collectively evaluated for impairment 934,177 925,182
Total ending loan balance, net of accrued interest receivable [1] $ 958,029 $ 955,727
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 13.37833% 6.23343%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.40006% 1.27434%
Total ending allowance for loan losses balance as a percentage of loan balance 1.69828% 1.43284%
Recorded investment $ 23,856 $ 30,595
Recorded investment collectively evaluated for impairment 937,959 928,569
Recorded Investment [1] 961,815 959,164
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 525 381
Allowance for loan losses collectively evaluated for impairment 10,048 8,816
Total ending allowance balance 10,573 9,197
Loans individually evaluated for impairment 26,057 18,015
Loans collectively evaluated for impairment 1,114,945 1,095,588
Total ending loan balance, net of accrued interest receivable [1] $ 1,141,002 $ 1,113,603
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 2.01481% 2.1149%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.90121% 0.80468%
Total ending allowance for loan losses balance as a percentage of loan balance 0.92664% 0.82588%
Recorded investment $ 26,065 $ 18,025
Recorded investment collectively evaluated for impairment 1,119,205 1,099,587
Recorded Investment [1] 1,145,270 1,117,612
Construction Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 61 1,356
Allowance for loan losses collectively evaluated for impairment 5,297 7,208
Total ending allowance balance 5,358 8,564
Loans individually evaluated for impairment 4,377 6,716
Loans collectively evaluated for impairment 181,599 166,629
Total ending loan balance, net of accrued interest receivable $ 185,976 $ 173,345
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 1.39365% 20.19059%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 2.91687% 4.32578%
Total ending allowance for loan losses balance as a percentage of loan balance 2.88102% 4.94044%
Recorded investment $ 4,377 $ 6,720
Recorded investment collectively evaluated for impairment 182,020 167,042
Recorded Investment 186,397 173,762
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 455 550
Allowance for loan losses collectively evaluated for impairment 10,873 12,964
Total ending allowance balance 11,328 13,514
Loans individually evaluated for impairment 23,700 25,323
Loans collectively evaluated for impairment 1,806,352 1,830,120
Total ending loan balance, net of accrued interest receivable $ 1,830,052 $ 1,855,443
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 1.91983% 2.17194%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.60193% 0.70837%
Total ending allowance for loan losses balance as a percentage of loan balance 0.619% 0.72834%
Recorded investment $ 23,700 $ 25,324
Recorded investment collectively evaluated for impairment 1,809,513 1,833,449
Recorded Investment 1,833,213 1,858,773
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 10,033 11,524
Total ending allowance balance 10,033 11,524
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 1,068,343 967,111
Total ending loan balance, net of accrued interest receivable $ 1,068,343 $ 967,111
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 0.93912% 1.19159%
Total ending allowance for loan losses balance as a percentage of loan balance 0.93912% 1.19159%
Recorded investment $ 0 $ 0
Recorded investment collectively evaluated for impairment 1,071,227 970,143
Recorded Investment 1,071,227 970,143
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 1
Total ending allowance balance 0 1
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 3,602 2,856
Total ending loan balance, net of accrued interest receivable $ 3,602 $ 2,856
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% 0.03501%
Total ending allowance for loan losses balance as a percentage of loan balance 0.00% 0.03501%
Recorded investment $ 0 $ 0
Recorded investment collectively evaluated for impairment 3,657 2,870
Recorded Investment $ 3,657 $ 2,870
[1] Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.