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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Assets        
Total cash and cash equivalents $ 308,227 $ 105,768 $ 240,056 $ 94,693
Interest-earning balances due from depository institutions 33,189 27,118    
FHLB stock 17,588 25,338    
Investment securities available-for-sale 2,312,721 3,137,158    
Investment securities held-to-maturity 869,650 1,528    
Total loans, net of allowance for loan losses 3,763,022 3,757,242    
Deposits:        
Noninterest-bearing 3,304,967 2,866,365    
Interest-bearing 2,654,505 2,738,293    
Junior subordinated debentures 25,774 25,774    
Swaps 621,868 573,707    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 308,227 105,768    
Interest-earning balances due from depository institutions 33,189 27,118    
FHLB stock 17,588 25,338    
Investment securities available-for-sale 2,312,721 3,137,158    
Investment securities held-to-maturity 869,650 1,528    
Total loans, net of allowance for loan losses 3,763,022 3,757,242    
Swaps 11,694 10,080    
Deposits:        
Noninterest-bearing 3,304,967 2,866,365    
Interest-bearing 2,654,505 2,738,293    
Borrowings 610,174 809,106    
Junior subordinated debentures 25,774 25,774    
Swaps 11,694 10,080    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 308,227 105,768    
Interest-earning balances due from depository institutions 33,189 27,118    
FHLB stock 17,588 25,338    
Investment securities available-for-sale 2,312,721 3,137,158    
Investment securities held-to-maturity 876,383 2,177    
Total loans, net of allowance for loan losses 3,809,324 3,794,454    
Swaps 11,694 10,080    
Deposits:        
Noninterest-bearing 3,304,967 2,866,365    
Interest-bearing 2,654,501 2,739,221    
Borrowings 610,103 822,607    
Junior subordinated debentures 26,031 26,005    
Swaps 11,694 10,080    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 308,227 105,768    
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 3,304,967 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 33,189 27,118    
FHLB stock 17,588 25,338    
Investment securities available-for-sale 2,312,721 3,137,158    
Investment securities held-to-maturity 874,446 0    
Total loans, net of allowance for loan losses 0 0    
Swaps 11,694 10,080    
Deposits:        
Noninterest-bearing 0 0    
Interest-bearing 2,654,501 2,739,221    
Borrowings 610,103 822,607    
Junior subordinated debentures 26,031 26,005    
Swaps 11,694 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 1,937 2,177    
Total loans, net of allowance for loan losses 3,809,324 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