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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets        
Total cash and cash equivalents $ 106,097 $ 105,768 $ 94,693 $ 98,431
Interest-earning balances due from depository institutions 32,691 27,118    
FHLB stock 17,588 25,338    
Investment securities available-for-sale 2,368,646 3,137,158    
Investment securities held-to-maturity 850,989 1,528    
Total loans, net of allowance for loan losses 3,957,781 3,757,242    
Swaps 9,344 10,080    
Deposits:        
Noninterest-bearing 3,250,174 2,866,365    
Interest-bearing 2,667,086 2,738,293    
Junior subordinated debentures 25,774 25,774    
Swaps 700,048 573,707    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 106,097 105,768    
Interest-earning balances due from depository institutions 32,691 27,118    
FHLB stock 17,588 25,338    
Investment securities available-for-sale 2,368,646 3,137,158    
Investment securities held-to-maturity 850,989 1,528    
Total loans, net of allowance for loan losses 3,957,781 3,757,242    
Swaps 9,344 10,080    
Deposits:        
Noninterest-bearing 3,250,174 2,866,365    
Interest-bearing 2,667,086 2,738,293    
Borrowings 736,704 809,106    
Junior subordinated debentures 25,774 25,774    
Swaps 9,344 10,080    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 106,097 105,768    
Interest-earning balances due from depository institutions 32,691 27,118    
FHLB stock 17,588 25,338    
Investment securities available-for-sale 2,368,646 3,137,158    
Investment securities held-to-maturity 853,039 2,177    
Total loans, net of allowance for loan losses 3,971,329 3,794,454    
Swaps 9,344 10,080    
Deposits:        
Noninterest-bearing 3,250,174 2,866,365    
Interest-bearing 2,666,186 2,739,221    
Borrowings 736,575 822,607    
Junior subordinated debentures 27,210 26,005    
Swaps 9,344 10,080    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 106,097 105,768    
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 3,250,174 2,866,365    
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 32,691 27,118    
FHLB stock 17,588 25,338    
Investment securities available-for-sale 2,368,646 3,137,158    
Investment securities held-to-maturity 851,186 0    
Total loans, net of allowance for loan losses 0 0    
Swaps 9,344 10,080    
Deposits:        
Noninterest-bearing 0 0    
Interest-bearing 2,666,186 2,739,221    
Borrowings 736,575 822,607    
Junior subordinated debentures 27,210 26,005    
Swaps 9,344 10,080    
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 1,853 2,177    
Total loans, net of allowance for loan losses 3,971,329 3,794,454    
Swaps 0 0    
Deposits:        
Noninterest-bearing 0 0    
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 0 0    
Swaps $ 0 $ 0