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Loans and Loans Held for Sale - Additional Information (Detail)
3 Months Ended
Mar. 31, 2016
USD ($)
contract
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Mar. 04, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, unearned income $ 3,700,000   $ 3,200,000  
Discount on loans related to purchase accounting fair value adjustments 10,400,000   $ 10,900,000  
Decrease in loans held for sale during the period 23,600,000      
Gain on sale of credit card portfolio $ 2,066,000 $ 0    
Percentage of commercial loans in total portfolio loans 77.00%   76.00%  
Concentration Risk, Product 0      
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of) 7.00%   7.00%  
Commitment to lend additional funds on troubled debt restructuring $ 0      
Minimum period of loan payment defaults following restructure for TDRs to be in default 90 days      
Commercial and Industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of loans modified not considered to be troubled debt restructuring | contract 1      
Loans modified not considered to be troubled debt restructuring $ 2,200,000      
Integrity Bancshares, Inc.        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Discount on loans related to purchase accounting fair value adjustments       $ 14,800,000
Installment and Other Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Decrease in loans held for sale during the period 22,900,000      
Gain on sale of credit card portfolio $ 2,100,000      
Commercial Real Estate and Commercial Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Combined percentage of commercial real estate and commercial construction in total commercial loans 66.00%   67.00%  
Combined percentage of commercial real estate and commercial construction in total portfolio loans 51.00%   51.00%  
Out of market exposure of combined portfolio (percent) 5.40%   5.80%  
Percentage of total loans out-of-state excluding contiguous states 2.70%   3.00%  
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial Loans $ 3,973,643,000   $ 3,836,877,000  
Commercial | Commercial Real Estate and Commercial Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial Loans 2,600,000,000      
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial Loans $ 1,203,105,000   $ 1,190,735,000