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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets        
Total cash and cash equivalents $ 239,586 $ 106,097 $ 401,372 $ 105,768
Interest-earning balances due from depository institutions 90,718 32,691    
FHLB stock 18,501 17,588    
Investment securities available-for-sale 2,294,659 2,368,646    
Investment securities held-to-maturity 812,893 850,989    
Total loans, net of allowance for loan losses 4,114,073 3,957,781    
Deposits:        
Noninterest-bearing 3,352,128 3,250,174    
Interest-bearing 2,864,150 2,667,086    
Junior subordinated debentures 25,774 25,774    
Swaps 639,992 700,048    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 239,586 106,097    
Interest-earning balances due from depository institutions 90,718 32,691    
FHLB stock 18,501 17,588    
Investment securities available-for-sale 2,294,659 2,368,646    
Investment securities held-to-maturity 812,893 850,989    
Total loans, net of allowance for loan losses 4,114,073 3,957,781    
Swaps 13,132 9,344    
Deposits:        
Noninterest-bearing 3,352,128 3,250,174    
Interest-bearing 2,864,150 2,667,086    
Borrowings 631,860 736,704    
Junior subordinated debentures 25,774 25,774    
Swaps 13,132 9,344    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 239,586 106,097    
Interest-earning balances due from depository institutions 90,718 32,691    
FHLB stock 18,501 17,588    
Investment securities available-for-sale 2,294,659 2,368,646    
Investment securities held-to-maturity 825,928 853,039    
Total loans, net of allowance for loan losses 4,166,203 3,971,329    
Swaps 13,132 9,344    
Deposits:        
Noninterest-bearing 3,352,128 3,250,174    
Interest-bearing 2,863,784 2,666,186    
Borrowings 631,749 736,575    
Junior subordinated debentures 27,284 27,210    
Swaps 13,132 9,344    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 239,586 106,097    
Interest-earning balances due from depository institutions 0 0    
FHLB stock 0 0    
Investment securities available-for-sale 0 0    
Investment securities held-to-maturity 0 0    
Total loans, net of allowance for loan losses 0 0    
Swaps 0 0    
Deposits:        
Noninterest-bearing 3,352,128 3,250,174    
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 0 0    
Swaps 0 0    
Estimated Fair Value [Member] | Level 2 [Member]        
Assets        
Total cash and cash equivalents 0 0    
Interest-earning balances due from depository institutions 90,718 32,691    
FHLB stock 18,501 17,588    
Investment securities available-for-sale 2,294,659 2,368,646    
Investment securities held-to-maturity 824,203 851,186    
Total loans, net of allowance for loan losses 0 0    
Swaps 13,132 9,344    
Deposits:        
Noninterest-bearing 0 0    
Interest-bearing 2,863,784 2,666,186    
Borrowings 631,749 736,575    
Junior subordinated debentures 27,284 27,210    
Swaps 13,132 9,344    
Estimated Fair Value [Member] | Level 3 [Member]        
Assets        
Total cash and cash equivalents 0 0    
Interest-earning balances due from depository institutions 0 0    
FHLB stock 0 0    
Investment securities available-for-sale 0 0    
Investment securities held-to-maturity 1,725 1,853    
Total loans, net of allowance for loan losses 4,166,203 3,971,329    
Swaps 0 0    
Deposits:        
Noninterest-bearing 0 0    
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 0 0    
Swaps $ 0 $ 0