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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Assets        
Total cash and cash equivalents $ 131,442 $ 98,431 $ 248,185 $ 345,343
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 39,420 56,651    
Investment securities available-for-sale 2,617,307 2,449,387    
Investment securities held-to-maturity 1,850 2,050    
Total loans, net of allowance for loan losses 3,200,639 3,159,872    
Accrued interest receivable 21,860 22,355    
Deposits:        
Noninterest-bearing 2,538,461 2,420,993    
Interest-bearing 2,357,025 2,352,994    
Junior subordinated debentures 25,774 67,012    
Accrued interest payable 1,106 1,493    
Level 1 [Member]
       
Assets        
Total cash and cash equivalents 131,442 98,431    
Interest-earning balances due from depository institutions          
FHLB stock          
Investment securities available-for-sale          
Investment securities held-to-maturity          
Total loans, net of allowance for loan losses          
Accrued interest receivable         
Swaps          
Deposits:        
Noninterest-bearing 2,538,461 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 39,420 56,651    
Investment securities available-for-sale 2,617,307 2,449,387    
Investment securities held-to-maturity          
Total loans, net of allowance for loan losses          
Accrued interest receivable 21,860 22,355    
Swaps 13,393 23,966    
Deposits:        
Noninterest-bearing          
Interest-bearing 2,358,090 2,354,126    
Borrowings 829,776 727,512    
Junior subordinated debentures 25,783 67,415    
Accrued interest payable 1,106 1,493    
Swaps 13,393 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 2,305 2,515    
Total loans, net of allowance for loan losses 3,423,040 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 131,442 98,431    
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 39,420 56,651    
Investment securities available-for-sale 2,617,307 2,449,387    
Investment securities held-to-maturity 1,850 2,050    
Total loans, net of allowance for loan losses 3,363,973 3,355,087    
Accrued interest receivable 21,860 22,355    
Swaps 13,393 23,966    
Deposits:        
Noninterest-bearing 2,538,461 2,420,993    
Interest-bearing 2,357,025 2,352,994    
Borrowings 807,503 698,178    
Junior subordinated debentures 25,774 67,012    
Accrued interest payable 1,106 1,493    
Swaps 13,393 23,966    
Estimated Fair Value [Member]
       
Assets        
Total cash and cash equivalents 131,442 98,431    
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 39,420 56,651    
Investment securities available-for-sale 2,617,307 2,449,387    
Investment securities held-to-maturity 2,305 2,515    
Total loans, net of allowance for loan losses 3,423,040 3,503,332    
Accrued interest receivable 21,860 22,355    
Swaps 13,393 23,966    
Deposits:        
Noninterest-bearing 2,538,461 2,420,993    
Interest-bearing 2,358,090 2,354,126    
Borrowings 829,776 727,512    
Junior subordinated debentures 25,783 67,415    
Accrued interest payable 1,106 1,493    
Swaps $ 13,393 $ 23,966