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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
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 27,571   $ 27,571   $ 29,504
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 35,356   35,356   34,398
Impaired Financing Receivable, with Related Allowance, Recorded Investment 13,256   13,256   25,747
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 13,890   13,890   26,517
Related allowance 4,255   4,255   9,461
Recorded investment 40,827   40,827   55,251
Unpaid principal balance 49,246   49,246   60,915
Average recorded investment 8,132 $ 15,634 6,483 $ 13,212  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 33,203 31,077 39,145 37,078  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 110 103 362 344  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 30 53 104 140  
Impaired Financing Receivable, Average Recorded Investment 41,335 46,711 45,628 50,290  
Interest Income Recognized 140 156 466 484  
Commercial, financial, agricultural and other [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 10,581   10,581   9,439
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 15,618   15,618   10,937
Impaired Financing Receivable, with Related Allowance, Recorded Investment 12,812   12,812   24,826
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 13,254   13,254   25,583
Related allowance 4,202   4,202   9,304
Average recorded investment 7,700 14,140 6,125 11,944  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 14,215 10,973 19,199 15,209  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 40 39 161 77  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 29 48 100 125  
Real estate construction [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 31   31   236
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 119   119   476
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0   0   0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0   0   0
Related allowance 0   0   0
Average recorded investment 0 0 0 0  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 32 295 102 1,506  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 0 1 0 19  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 0 0 0  
Residential real estate [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 9,778   9,778   10,773
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 11,399   11,399   12,470
Impaired Financing Receivable, with Related Allowance, Recorded Investment 364   364   367
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 556   556   380
Related allowance 20   20   56
Average recorded investment 351 1,406 275 1,178  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 10,748 10,590 10,987 11,047  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 39 38 118 167  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 3 0 12  
Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 6,885   6,885   8,768
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 7,862   7,862   10,178
Impaired Financing Receivable, with Related Allowance, Recorded Investment 80   80   554
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 80   80   554
Related allowance 33   33   101
Average recorded investment 81 88 83 90  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 7,894 8,873 8,545 9,007  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 26 24 69 78  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 1 2 4 3  
Loans to individuals [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 296   296   288
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 358   358   337
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0   0   0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0   0   0
Related allowance 0   0   $ 0
Average recorded investment 0 0 0 0  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 314 346 312 309  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 5 1 14 3  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0 $ 0 $ 0