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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 24,817   $ 24,817   $ 33,466
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 28,674   28,674   39,291
Recorded investment 46,287   46,287   59,383
Unpaid principal balance 50,854   50,854   66,307
Related allowance 6,072   6,072   8,824
Impaired Financing Receivable, with Related Allowance, Recorded Investment 21,470   21,470   25,917
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 22,180   22,180   27,016
Average recorded investment 18,058 29,607 16,741 31,428  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 40 62 93 121  
Impaired Financing Receivable, Average Recorded Investment 49,420 78,112 52,080 87,506  
Interest Income Recognized 158 172 324 332  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 31,362 48,505 35,339 56,078  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 118 110 231 211  
Commercial, financial, agricultural and other [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 7,422   7,422   6,752
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 8,585   8,585   7,649
Related allowance 4,995   4,995   7,364
Impaired Financing Receivable, with Related Allowance, Recorded Investment 17,994   17,994   21,482
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 18,422   18,422   22,082
Average recorded investment 15,086 18,486 14,333 20,534  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 32 12 76 31  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 12,658 12,853 13,841 12,333  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 14 55 32 106  
Real estate construction [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 586   586   3,486
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 1,154   1,154   6,664
Related allowance 0   0   94
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0   0   414
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0   0   737
Average recorded investment 0 1,733 0 2,017  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 14 0 26  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 1,148 5,538 2,112 6,900  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 6 0 18 0  
Loans to individuals [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 341   341   289
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 373   373   307
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 310 246 290 246  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 1 1 2 2  
Residential real estate [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 9,102   9,102   9,333
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 10,183   10,183   9,952
Related allowance 546   546   1,282
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,940   1,940   3,533
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 2,085   2,085   3,585
Average recorded investment 1,836 3,680 1,738 3,117  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 7 8 15 12  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 9,858 9,003 10,602 8,732  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 75 41 124 78  
Commercial Real Estate [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 7,366   7,366   13,606
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 8,379   8,379   14,719
Related allowance 531   531   84
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,536   1,536   488
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,673   1,673   612
Average recorded investment 1,136 5,708 670 5,760  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 1 28 2 52  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 7,388 20,865 8,494 27,867  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method $ 22 $ 13 $ 55 $ 25