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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual $ 48,076 $ 36,705  
Total past due and nonaccrual 62,542 49,636  
Current 4,781,234 4,634,114  
Total 4,843,776 4,683,750 $ 4,490,854
Commercial, financial, agricultural and other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 37,429 23,653  
Total past due and nonaccrual 40,770 24,195  
Current 1,144,292 1,126,711  
Total 1,185,062 1,150,906  
Real estate construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 0 28  
Total past due and nonaccrual 0 308  
Current 242,132 220,428  
Total 242,132 220,736  
Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 6,448 6,500  
Total past due and nonaccrual 12,777 13,045  
Current 1,186,228 1,211,420  
Total 1,199,005 1,224,465  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 3,931 6,223  
Total past due and nonaccrual 5,098 7,069  
Current 1,643,124 1,471,931  
Total 1,648,222 1,479,000  
Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 268 301  
Total past due and nonaccrual 3,897 5,019  
Current 565,458 603,624  
Total 569,355 608,643  
Financing Receivables, 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 10,126 8,598  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 2,344 364  
Financing Receivables, 30 to 59 Days Past Due [Member] | Real estate construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 0 280  
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 4,544 4,175  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 1,166 781  
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 2,072 2,998  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 2,956 1,878  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 714 49  
Financing Receivables, 60 to 89 Days Past Due [Member] | Real estate construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 1,542 1,055  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 700 774  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 1,384 2,455  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 283 129  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real estate construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 243 1,315  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 1 65  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual $ 857 $ 946