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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual $ 28,803 $ 42,667  
Total past due and nonaccrual 43,339 61,449  
Current 4,532,396 4,395,859  
Total 4,575,735 4,457,308 $ 4,411,481
Commercial, financial, agricultural and other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 17,334 27,007  
Total past due and nonaccrual 21,359 30,300  
Current 1,105,522 1,021,809  
Total 1,126,881 1,052,109  
Real estate construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 31 236  
Total past due and nonaccrual 31 237  
Current 179,679 120,548  
Total 179,710 120,785  
Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 6,563 7,900  
Total past due and nonaccrual 11,930 15,434  
Current 1,192,290 1,210,910  
Total 1,204,220 1,226,344  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 4,640 7,306  
Total past due and nonaccrual 5,448 9,225  
Current 1,430,506 1,396,031  
Total 1,435,954 1,405,256  
Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 235 218  
Total past due and nonaccrual 4,571 6,253  
Current 624,399 646,561  
Total 628,970 652,814  
Financing Receivables, 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 10,038 13,473  
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 3,817 2,816  
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 0  
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 3,562 5,162  
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 35 1,797  
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 2,624 3,698  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 2,444 2,690  
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 59 213  
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 1  
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 1,187 1,295  
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 442 122  
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 756 1,059  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 2,054 2,619  
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 149 264  
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 618 1,077  
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 331 0  
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 $ 956 $ 1,278