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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 43,905   $ 43,905   $ 58,014
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 50,433   50,433   88,596
Recorded investment 71,219   71,219   107,555
Unpaid principal balance 82,042   82,042   139,687
Related allowance 8,239   8,239   17,778
Impaired Financing Receivable, with Related Allowance, Recorded Investment 27,314   27,314   49,541
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 31,609   31,609   51,091
Average recorded investment 20,631 41,201 26,029 32,651  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 35 19 106 36  
Impaired Financing Receivable, Average Recorded Investment 70,627 87,099 81,915 84,055  
Interest Income Recognized 171 133 504 219  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 49,996 45,898 55,886 51,404  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 136 114 398 183  
Commercial, financial, agricultural and other [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 10,209   10,209   8,080
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 11,137   11,137   8,983
Related allowance 4,889   4,889   10,331
Impaired Financing Receivable, with Related Allowance, Recorded Investment 16,530   16,530   26,532
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 17,064   17,064   27,412
Average recorded investment 10,370 25,469 15,552 21,025  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 16 2 46 5  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 14,000 6,664 14,482 9,281  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 41 94 147 116  
Real estate construction [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,251   2,251   8,491
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 5,795   5,795   35,555
Related allowance 165   165   300
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,866   1,866   2,756
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 2,181   2,181   3,087
Average recorded investment 1,541 8,848 1,848 7,381  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 8 0 35 0  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 2,340 4,954 5,390 6,641  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 0 0 0 0  
Loans to individuals [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 257   257   256
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 272   272   256
Related allowance 0   0   0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0   0   0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0   0   0
Average recorded investment 0 0 0 0  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 0 0 0  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 251 28 248 9  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 1 0 3 0  
Residential real estate [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 9,493   9,493   7,928
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 10,118   10,118   8,401
Related allowance 1,377   1,377   780
Impaired Financing Receivable, with Related Allowance, Recorded Investment 3,406   3,406   2,695
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 3,440   3,440   2,696
Average recorded investment 3,349 2,130 3,001 1,532  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 10 6 24 20  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 9,977 4,374 9,376 7,604  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 52 6 129 17  
Commercial Real Estate [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 21,695   21,695   33,259
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 23,111   23,111   35,401
Related allowance 1,808   1,808   6,367
Impaired Financing Receivable, with Related Allowance, Recorded Investment 5,512   5,512   17,558
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 8,924   8,924   17,896
Average recorded investment 5,371 4,754 5,628 2,713  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 1 11 1 11  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 23,428 29,878 26,390 27,869  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method $ 42 $ 14 $ 119 $ 50