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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 93,906   $ 93,906   $ 98,752
Unpaid principal balance 124,209   124,209   130,627
Related allowance 12,914   12,914   13,236
Average Recorded Investment 87,099 151,403 84,055 140,649  
Interest Income Recognized 133 409 219 690  
Commercial, financial, agricultural and other with no related allowance recorded [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 6,762   6,762   2,010
Unpaid principal balance 7,716   7,716   3,418
Related allowance 0   0   0
Average Recorded Investment 6,664 1,989 9,281 3,695  
Interest Income Recognized 94 6 116 11  
Real estate construction with no related allowance recorded [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 4,087   4,087   10,814
Unpaid principal balance 7,424   7,424   20,161
Related allowance 0   0   0
Average Recorded Investment 4,954 16,465 6,641 21,611  
Interest Income Recognized 0 (1) 0 1  
Residential real estate with no related allowance recorded [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 7,087   7,087   3,125
Unpaid principal balance 7,556   7,556   3,513
Related allowance 0   0   0
Average Recorded Investment 4,374 3,131 7,604 2,519  
Interest Income Recognized 6 3 17 4  
Commercial real estate with no related allowance recorded [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 29,394   29,394   36,777
Unpaid principal balance 31,055   31,055   41,974
Related allowance 0   0   0
Average Recorded Investment 29,878 19,676 27,869 27,322  
Interest Income Recognized 14 228 50 246  
Loans to individuals with no related allowance recorded [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 84   84   0
Unpaid principal balance 84   84   0
Related allowance 0   0   0
Average Recorded Investment 28 7 9 13  
Interest Income Recognized 0 0 0 0  
Subtotal with no related allowance recorded [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 47,414   47,414   52,726
Unpaid principal balance 53,835   53,835   69,066
Related allowance 0   0   0
Average Recorded Investment 45,898 41,268 51,404 55,160  
Interest Income Recognized 114 236 183 262  
Commercial, financial, agricultural and other with an allowance recorded [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 26,719   26,719   34,056
Unpaid principal balance 27,558   27,558   34,341
Related allowance 7,306   7,306   9,069
Average Recorded Investment 25,469 37,552 21,025 29,614  
Interest Income Recognized 2 50 5 126  
Real estate construction with related allowance [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 7,482   7,482   6,298
Unpaid principal balance 30,312   30,312   21,402
Related allowance 973   973   2,960
Average Recorded Investment 8,848 20,237 7,381 19,858  
Interest Income Recognized 0 (2) 0 0  
Residential Real Estate With Related Allowance [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 2,752   2,752   955
Unpaid principal balance 2,752   2,752   955
Related allowance 719   719   93
Average Recorded Investment 2,130 669 1,532 422  
Interest Income Recognized 6 1 20 1  
Commercial Real Estate With Related Allowance [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 9,539   9,539   4,717
Unpaid principal balance 9,752   9,752   4,863
Related allowance 3,916   3,916   1,114
Average Recorded Investment 4,754 51,677 2,713 35,595  
Interest Income Recognized 11 124 11 301  
Loans To Individuals With Related Allowance [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 0   0   0
Unpaid principal balance 0   0   0
Related allowance 0   0   0
Average Recorded Investment 0 0 0 0  
Interest Income Recognized 0 0 0 0  
Subtotal With Related Allowance [Member]
         
Financing Receivable, Impaired [Line Items]          
Recorded investment 46,492   46,492   46,026
Unpaid principal balance 70,374   70,374   61,561
Related allowance 12,914   12,914   13,236
Average Recorded Investment 41,201 110,135 32,651 85,489  
Interest Income Recognized $ 19 $ 173 $ 36 $ 428