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Allowance for Loan Losses - Composition of the Allowance for Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Ending allowance balance attributed to loans    
Individually evaluated for impairment $ 8,276 $ 15,935
Collectively evaluated for impairment 47,261 52,509
Total ending allowance balance 55,537 68,444
Loan Balance:    
Loans individually evaluated for impairment 137,238 187,135
Loans collectively evaluated for impairment 4,313,084 4,129,964
Total ending loan balance 4,450,322 4,317,099
Allowance for loan losses as a percentage of loan balance:    
Loans individually evaluated for impairment 6.03% 8.52%
Loans collectively evaluated for impairment 1.10% 1.27%
Total ending loan balance 1.25% 1.59%
Recorded Investment:    
Loans individually evaluated for impairment 137,339 187,135
Loans collectively evaluated for impairment 4,326,570 4,144,648
Recorded Investment 4,463,909 4,331,783
Commercial, financial and agricultural
   
Ending allowance balance attributed to loans    
Individually evaluated for impairment 3,180 5,819
Collectively evaluated for impairment 12,455 11,131
Total ending allowance balance 15,635 16,950
Loan Balance:    
Loans individually evaluated for impairment 22,523 40,621
Loans collectively evaluated for impairment 801,404 703,176
Total ending loan balance 823,927 [1] 743,797 [1]
Allowance for loan losses as a percentage of loan balance:    
Loans individually evaluated for impairment 14.12% 14.33%
Loans collectively evaluated for impairment 1.55% 1.58%
Total ending loan balance 1.90% 2.28%
Recorded Investment:    
Loans individually evaluated for impairment 22,587 40,621
Loans collectively evaluated for impairment 804,316 706,297
Recorded Investment 826,903 [1] 746,918 [1]
Commercial real estate
   
Ending allowance balance attributed to loans    
Individually evaluated for impairment 1,540 4,431
Collectively evaluated for impairment 10,196 11,108
Total ending allowance balance 11,736 15,539
Loan Balance:    
Loans individually evaluated for impairment 44,267 51,978
Loans collectively evaluated for impairment 1,047,897 1,056,596
Total ending loan balance 1,092,164 [1] 1,108,574 [1]
Allowance for loan losses as a percentage of loan balance:    
Loans individually evaluated for impairment 3.48% 8.52%
Loans collectively evaluated for impairment 0.97% 1.05%
Total ending loan balance 1.07% 1.40%
Recorded Investment:    
Loans individually evaluated for impairment 44,278 51,978
Loans collectively evaluated for impairment 1,051,725 1,060,831
Recorded Investment 1,096,003 [1] 1,112,809 [1]
Construction real estate
   
Ending allowance balance attributed to loans    
Individually evaluated for impairment 2,277 3,414
Collectively evaluated for impairment 4,564 11,019
Total ending allowance balance 6,841 14,433
Loan Balance:    
Loans individually evaluated for impairment 34,814 50,240
Loans collectively evaluated for impairment 130,714 167,306
Total ending loan balance 165,528 217,546
Allowance for loan losses as a percentage of loan balance:    
Loans individually evaluated for impairment 6.54% 6.80%
Loans collectively evaluated for impairment 3.49% 6.59%
Total ending loan balance 4.13% 6.63%
Recorded Investment:    
Loans individually evaluated for impairment 34,834 50,240
Loans collectively evaluated for impairment 131,176 167,856
Recorded Investment 166,010 218,096
Residential real estate
   
Ending allowance balance attributed to loans    
Individually evaluated for impairment 1,279 2,271
Collectively evaluated for impairment 13,480 13,421
Total ending allowance balance 14,759 15,692
Loan Balance:    
Loans individually evaluated for impairment 35,616 44,276
Loans collectively evaluated for impairment 1,678,029 1,584,342
Total ending loan balance 1,713,645 1,628,618
Allowance for loan losses as a percentage of loan balance:    
Loans individually evaluated for impairment 3.59% 5.13%
Loans collectively evaluated for impairment 0.80% 0.85%
Total ending loan balance 0.86% 0.96%
Recorded Investment:    
Loans individually evaluated for impairment 35,622 44,276
Loans collectively evaluated for impairment 1,681,449 1,588,147
Recorded Investment 1,717,071 1,632,423
Consumer
   
Ending allowance balance attributed to loans    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 6,566 5,830
Total ending allowance balance 6,566 5,830
Loan Balance:    
Loans individually evaluated for impairment 18 20
Loans collectively evaluated for impairment 651,912 616,485
Total ending loan balance 651,930 616,505
Allowance for loan losses as a percentage of loan balance:    
Loans individually evaluated for impairment 0.00% 0.00%
Loans collectively evaluated for impairment 1.01% 0.95%
Total ending loan balance 1.01% 0.95%
Recorded Investment:    
Loans individually evaluated for impairment 18 20
Loans collectively evaluated for impairment 654,747 619,415
Recorded Investment 654,765 619,435
Leases
   
Ending allowance balance attributed to loans    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 0 0
Total ending allowance balance 0 0
Loan Balance:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 3,128 2,059
Total ending loan balance 3,128 2,059
Allowance for loan losses as a percentage of loan balance:    
Loans individually evaluated for impairment 0.00% 0.00%
Loans collectively evaluated for impairment 0.00% 0.00%
Total ending loan balance 0.00% 0.00%
Recorded Investment:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 3,157 2,102
Recorded Investment $ 3,157 $ 2,102
[1] Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH/Vision commercial land and development loans are an immaterial amount of consumer loans that are not broken out by class.