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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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 50,844 $ 55,251  
Unpaid Principal Balance 61,835 60,915  
Related Allowance 7,045 9,461  
Average Recorded Investment 45,458 49,794 $ 78,175
Interest Income Recognized 615 625 679
Commercial, financial, agricultural and other with no related allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 11,344 9,439  
Unpaid Principal Balance 15,673 10,937  
Average Recorded Investment 17,692 11,536 14,454
Interest Income Recognized 216 133 73
Real estate construction with no related allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 28 236  
Unpaid Principal Balance 117 476  
Average Recorded Investment 95 1,190 5,923
Interest Income Recognized 0 19 47
Residential real estate with no related allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 9,952 10,773  
Unpaid Principal Balance 11,819 12,470  
Average Recorded Investment 10,635 11,592 9,280
Interest Income Recognized 172 210 211
Commercial real estate with no related allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 7,562 8,768  
Unpaid Principal Balance 9,449 10,178  
Average Recorded Investment 7,890 8,830 27,881
Interest Income Recognized 90 98 250
Loans to individuals with no related allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 421 288  
Unpaid Principal Balance 507 337  
Average Recorded Investment 338 308 255
Interest Income Recognized 4 4 3
Subtotal with no related allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 29,307 29,504  
Unpaid Principal Balance 37,565 34,398  
Average Recorded Investment 36,650 33,456 57,793
Interest Income Recognized 482 464 584
Commercial, financial, agricultural and other With an allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 20,132 24,826  
Unpaid Principal Balance 22,590 25,583  
Related Allowance 6,952 9,304  
Average Recorded Investment 7,731 15,797 16,479
Interest Income Recognized 129 143 64
Real estate construction with an allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance 0 0  
Average Recorded Investment 0 0 515
Interest Income Recognized 0 0 0
Residential real estate With an allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 461 367  
Unpaid Principal Balance 672 380  
Related Allowance 51 56  
Average Recorded Investment 403 357 3,200
Interest Income Recognized 0 14 31
Commercial real estate With an allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 944 554  
Unpaid Principal Balance 1,008 554  
Related Allowance 42 101  
Average Recorded Investment 674 184 188
Interest Income Recognized 4 4 0
Loans to individuals With an allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance 0 0  
Average Recorded Investment 0 0 0
Interest Income Recognized 0 0 0
Subtotal With an allowance recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 21,537 25,747  
Unpaid Principal Balance 24,270 26,517  
Related Allowance 7,045 9,461  
Average Recorded Investment 8,808 16,338 20,382
Interest Income Recognized $ 133 $ 161 $ 95