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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets        
Total cash and cash equivalents $ 94,693 $ 98,431 $ 345,343 $ 404,275
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 32,331 56,651    
Investment securities available-for-sale 2,663,642 2,449,387    
Investment securities held-to-maturity 1,777 2,050    
Non-covered loans held-for-sale 3,667      
Total loans, net of allowance for loan losses 3,310,681 3,159,872    
Accrued interest receivable 22,051 22,355    
Swaps 10,846 23,966    
Deposits:        
Noninterest-bearing 2,562,980 2,420,993    
Interest-bearing 2,327,651 2,352,994    
Junior subordinated debentures 25,774 67,012    
Accrued interest payable 1,111 1,493    
Swaps 654,097 497,210    
Level 1 [Member]
        
Assets        
Total cash and cash equivalents 94,693 98,431    
Interest-earning balances due from depository institutions          
FHLB stock          
Investment securities available-for-sale          
Investment securities held-to-maturity          
Non-covered loans held-for-sale         
Total loans, net of allowance for loan losses          
Accrued interest receivable          
Swaps          
Deposits:        
Noninterest-bearing 2,562,980 2,420,993    
Interest-bearing          
Borrowings          
Junior subordinated debentures          
Accrued interest payable          
Swaps          
Level 2 [Member]
        
Assets        
Total cash and cash equivalents          
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 32,331 56,651    
Investment securities available-for-sale 2,663,642 2,449,387    
Investment securities held-to-maturity          
Non-covered loans held-for-sale         
Total loans, net of allowance for loan losses          
Accrued interest receivable 22,051 22,355    
Swaps 10,846 23,966    
Deposits:        
Noninterest-bearing          
Interest-bearing 2,328,488 2,354,126    
Borrowings 932,408 727,512    
Junior subordinated debentures 25,819 67,415    
Accrued interest payable 1,111 1,493    
Swaps 10,846 23,966    
Level 3 [Member]
        
Assets        
Total cash and cash equivalents          
Interest-earning balances due from depository institutions          
FHLB stock          
Investment securities available-for-sale          
Investment securities held-to-maturity 2,296 2,515    
Non-covered loans held-for-sale 8,897      
Total loans, net of allowance for loan losses 3,527,725 3,503,332    
Accrued interest receivable          
Swaps          
Deposits:        
Noninterest-bearing          
Interest-bearing          
Borrowings          
Junior subordinated debentures          
Accrued interest payable          
Swaps          
Carrying Value [Member]
        
Assets        
Total cash and cash equivalents 94,693 98,431    
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 32,331 56,651    
Investment securities available-for-sale 2,663,642 2,449,387    
Investment securities held-to-maturity 1,777 2,050    
Non-covered loans held-for-sale 3,667      
Total loans, net of allowance for loan losses 3,470,996 3,355,087    
Accrued interest receivable 22,051 22,355    
Swaps 10,846 23,966    
Deposits:        
Noninterest-bearing 2,562,980 2,420,993    
Interest-bearing 2,327,651 2,352,994    
Borrowings 911,457 698,178    
Junior subordinated debentures 25,774 67,012    
Accrued interest payable 1,111 1,493    
Swaps 10,846 23,966    
Estimated Fair Value [Member]
        
Assets        
Total cash and cash equivalents 94,693 98,431    
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 32,331 56,651    
Investment securities available-for-sale 2,663,642 2,449,387    
Investment securities held-to-maturity 2,296 2,515    
Non-covered loans held-for-sale 8,897      
Total loans, net of allowance for loan losses 3,527,725 3,503,332    
Accrued interest receivable 22,051 22,355    
Swaps 10,846 23,966    
Deposits:        
Noninterest-bearing 2,562,980 2,420,993    
Interest-bearing 2,328,488 2,354,126    
Borrowings 932,408 727,512    
Junior subordinated debentures 25,819 67,415    
Accrued interest payable 1,111 1,493    
Swaps $ 10,846 $ 23,966