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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due $ 8,598 $ 13,473  
60 - 89 days past due 1,878 2,690  
90 days and greater and still accruing 2,455 2,619  
Nonaccrual 36,705 42,667  
Total past due and nonaccrual 49,636 61,449  
Current 4,634,114 4,395,859  
Loans 4,683,750 4,457,308 $ 4,283,833
Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 364 2,816  
60 - 89 days past due 49 213  
90 days and greater and still accruing 129 264  
Nonaccrual 23,653 27,007  
Total past due and nonaccrual 24,195 30,300  
Current 1,126,711 1,021,809  
Loans 1,150,906 1,052,109  
Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 280 0  
60 - 89 days past due 0 1  
90 days and greater and still accruing 0 0  
Nonaccrual 28 236  
Total past due and nonaccrual 308 237  
Current 220,428 120,548  
Loans 220,736 120,785  
Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 4,175 5,162  
60 - 89 days past due 1,055 1,295  
90 days and greater and still accruing 1,315 1,077  
Nonaccrual 6,500 7,900  
Total past due and nonaccrual 13,045 15,434  
Current 1,211,420 1,210,910  
Loans 1,224,465 1,226,344  
Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 781 1,797  
60 - 89 days past due 0 122  
90 days and greater and still accruing 65 0  
Nonaccrual 6,223 7,306  
Total past due and nonaccrual 7,069 9,225  
Current 1,471,931 1,396,031  
Loans 1,479,000 1,405,256  
Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 2,998 3,698  
60 - 89 days past due 774 1,059  
90 days and greater and still accruing 946 1,278  
Nonaccrual 301 218  
Total past due and nonaccrual 5,019 6,253  
Current 603,624 646,561  
Loans 608,643 652,814  
Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,150,906 1,052,109 1,021,056
Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 220,736 120,785 93,289
Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,224,465 1,226,344 1,262,718
Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,479,000 1,405,256 1,296,472
Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 608,643 $ 652,814 $ 610,298