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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 6,003,059 $ 5,774,139 $ 5,640,106
Commercial, financial, agricultural and other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income   1,138,473  
Real estate construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income   358,978  
Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income   1,562,405  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income   2,123,544  
Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income   590,739  
Originated Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,550,399 5,275,296  
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,201,705 1,100,947  
Originated Loans [Member] | Real estate construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 435,385 353,008  
Originated Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,350,765 1,313,645  
Originated Loans [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,939,608 1,922,349  
Originated Loans [Member] | Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 622,936 585,347  
Acquired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 452,660 498,843  
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 34,719 37,526  
Acquired Loans [Member] | Real estate construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 6,469 5,970  
Acquired Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 228,676 248,760  
Acquired Loans [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 178,974 201,195  
Acquired Loans [Member] | Loans to individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 3,822 $ 5,392