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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 29,923   $ 29,923   $ 33,466
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 34,588   34,588   39,291
Impaired Financing Receivable, with Related Allowance, Recorded Investment 15,334   15,334   25,917
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 15,859   15,859   27,016
Related allowance 4,632   4,632   8,824
Recorded investment 45,257   45,257   59,383
Unpaid principal balance 50,447   50,447   66,307
Average recorded investment 15,634 20,631 13,212 26,029  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 31,077 49,996 37,078 55,886  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 103 136 344 398  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 53 35 140 106  
Impaired Financing Receivable, Average Recorded Investment 46,711 70,627 50,290 81,915  
Interest Income Recognized 156 171 484 504  
Commercial, financial, agricultural and other [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 10,833   10,833   6,752
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 12,207   12,207   7,649
Impaired Financing Receivable, with Related Allowance, Recorded Investment 13,802   13,802   21,482
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 14,192   14,192   22,082
Related allowance 4,271   4,271   7,364
Average recorded investment 14,140 10,370 11,944 15,552  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 10,973 14,000 15,209 14,482  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 39 41 77 147  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 48 16 125 46  
Real estate construction [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 291   291   3,486
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 867   867   6,664
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0   0   414
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0   0   737
Related allowance 0   0   94
Average recorded investment 0 1,541 0 1,848  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 295 2,340 1,506 5,390  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 1 0 19 0  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 8 0 35  
Residential real estate [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 10,093   10,093   9,333
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 11,171   11,171   9,952
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,445   1,445   3,533
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,579   1,579   3,585
Related allowance 332   332   1,282
Average recorded investment 1,406 3,349 1,178 3,001  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 10,590 9,977 11,047 9,376  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 38 52 167 129  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 3 10 12 24  
Commercial Real Estate [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 8,358   8,358   13,606
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 9,887   9,887   14,719
Impaired Financing Receivable, with Related Allowance, Recorded Investment 87   87   488
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 88   88   612
Related allowance 29   29   84
Average recorded investment 88 5,371 90 5,628  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 8,873 23,428 9,007 26,390  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 24 42 78 119  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 2 1 3 1  
Loans to individuals [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 348   348   289
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 456   456   307
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 346 251 309 248  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 1 1 3 3  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0 $ 0 $ 0