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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment $ 4,145 $ 548
Allowance for loan losses collectively evaluated for impairment 49,677 50,076
Total ending allowance balance 53,822 50,624
Loans individually evaluated for impairment 73,095 70,415
Loans collectively evaluated for impairment 5,292,342 5,201,442
Total ending loan balance, net of accrued interest receivable $ 5,365,437 $ 5,271,857
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 5.6707% 0.77824%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.93866% 0.96273%
Total ending allowance for loan losses balance as a percentage of loan balance 1.00312% 0.96027%
Recorded investment $ 73,144 $ 70,426
Recorded investment collectively evaluated for impairment 5,306,888 5,216,404
Recorded Investment 5,380,032 5,286,830
Commercial Financial And Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 3,774 152
Allowance for loan losses collectively evaluated for impairment 12,972 13,282
Total ending allowance balance 16,746 13,434
Loans individually evaluated for impairment 28,475 20,622
Loans collectively evaluated for impairment 978,004 973,997
Total ending loan balance, net of accrued interest receivable [1] $ 1,006,479 $ 994,619
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 13.25373% 0.73708%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.32637% 1.36366%
Total ending allowance for loan losses balance as a percentage of loan balance 1.66382% 1.35067%
Recorded investment $ 28,475 $ 20,624
Recorded investment collectively evaluated for impairment 981,841 977,553
Recorded Investment [1] 1,010,316 998,177
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 290 309
Allowance for loan losses collectively evaluated for impairment 10,161 10,123
Total ending allowance balance 10,451 10,432
Loans individually evaluated for impairment 21,742 24,465
Loans collectively evaluated for impairment 1,170,139 1,131,238
Total ending loan balance, net of accrued interest receivable [1] $ 1,191,881 $ 1,155,703
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 1.33382% 1.26303%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.86836% 0.89486%
Total ending allowance for loan losses balance as a percentage of loan balance 0.87685% 0.90265%
Recorded investment $ 21,790 $ 24,474
Recorded investment collectively evaluated for impairment 1,174,051 1,135,390
Recorded Investment [1] 1,195,841 1,159,864
Construction Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 44 0
Allowance for loan losses collectively evaluated for impairment 4,633 5,247
Total ending allowance balance 4,677 5,247
Loans individually evaluated for impairment 1,634 2,226
Loans collectively evaluated for impairment 168,765 186,719
Total ending loan balance, net of accrued interest receivable $ 170,399 $ 188,945
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 2.69278% 0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 2.74524% 2.81011%
Total ending allowance for loan losses balance as a percentage of loan balance 2.74473% 2.777%
Recorded investment $ 1,636 $ 2,226
Recorded investment collectively evaluated for impairment 169,248 187,240
Recorded Investment 170,884 189,466
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 29 87
Allowance for loan losses collectively evaluated for impairment 10,290 10,871
Total ending allowance balance 10,319 10,958
Loans individually evaluated for impairment 21,236 23,102
Loans collectively evaluated for impairment 1,755,331 1,785,395
Total ending loan balance, net of accrued interest receivable $ 1,776,567 $ 1,808,497
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.13656% 0.37659%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.58621% 0.60888%
Total ending allowance for loan losses balance as a percentage of loan balance 0.58084% 0.60592%
Recorded investment $ 21,235 $ 23,102
Recorded investment collectively evaluated for impairment 1,758,425 1,788,714
Recorded Investment 1,779,660 1,811,816
Consumer [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 11,621 10,553
Total ending allowance balance 11,629 10,553
Loans individually evaluated for impairment 8 0
Loans collectively evaluated for impairment 1,216,756 1,120,850
Total ending loan balance, net of accrued interest receivable $ 1,216,764 $ 1,120,850
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 0.95508% 0.94152%
Total ending allowance for loan losses balance as a percentage of loan balance 0.95573% 0.94152%
Recorded investment $ 8 $ 0
Recorded investment collectively evaluated for impairment 1,219,946 1,124,235
Recorded Investment 1,219,954 1,124,235
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 3,347 3,243
Total ending loan balance, net of accrued interest receivable $ 3,347 $ 3,243
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 3,377 3,272
Recorded Investment $ 3,377 $ 3,272
[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.