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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Assets        
Total cash and cash equivalents $ 98,431 $ 345,343 $ 404,275 $ 103,254
Interest-earning balances due from depository institutions 70,000 60,000    
FHLB stock 56,651 72,689    
Investment securities available-for-sale 2,449,387 2,201,526    
Investment securities held-to-maturity 2,050 2,383    
Non-covered loans held-for-sale   348    
Covered loans held-for-sale   5,664    
Total loans, net of allowance for credit losses 3,159,872 3,125,763    
Accrued interest receivable 22,355 23,512    
Deposits:        
Noninterest-bearing 2,420,993 2,027,876    
Interest-bearing 2,352,994 2,576,672    
Junior subordinated debentures 67,012 115,055    
Accrued interest payable 1,493 3,526    
Level 1 [Member]
        
Assets        
Total cash and cash equivalents 98,431 345,343    
Deposits:        
Noninterest-bearing 2,420,993 2,027,876    
Level 2 [Member]
        
Assets        
Interest-earning balances due from depository institutions 70,000 60,000    
FHLB stock 56,651 72,689    
Investment securities available-for-sale 2,449,387 2,201,526    
Accrued interest receivable 22,355 23,512    
Swaps 23,966 20,497    
Deposits:        
Interest-bearing 2,354,126 2,577,825    
Borrowings 727,512 1,012,211    
Junior subordinated debentures 67,415 115,854    
Accrued interest payable 1,493 3,526    
Swaps 23,966 20,497    
Level 3 [Member]
        
Assets        
Investment securities held-to-maturity 2,515 2,383    
Non-covered loans held-for-sale   348    
Covered loans held-for-sale   5,664    
Total loans, net of allowance for credit losses 3,503,332 3,534,960    
Carrying Value [Member]
        
Assets        
Total cash and cash equivalents 98,431 345,343    
Interest-earning balances due from depository institutions 70,000 60,000    
FHLB stock 56,651 72,689    
Investment securities available-for-sale 2,449,387 2,201,526    
Investment securities held-to-maturity 2,050 2,383    
Non-covered loans held-for-sale   348    
Covered loans held-for-sale   5,664    
Total loans, net of allowance for credit losses 3,355,087 3,382,632    
Accrued interest receivable 22,355 23,512    
Swaps 23,966 20,497    
Deposits:        
Noninterest-bearing 2,420,993 2,027,876    
Interest-bearing 2,352,994 2,576,672    
Borrowings 698,178 958,032    
Junior subordinated debentures 67,012 115,055    
Accrued interest payable 1,493 3,526    
Swaps 23,966 20,497    
Estimated Fair Value [Member]
        
Assets        
Total cash and cash equivalents 98,431 345,343    
Interest-earning balances due from depository institutions 70,000 60,000    
FHLB stock 56,651 72,689    
Investment securities available-for-sale 2,449,387 2,201,526    
Investment securities held-to-maturity 2,515 2,383    
Non-covered loans held-for-sale   348    
Covered loans held-for-sale   5,664    
Total loans, net of allowance for credit losses 3,503,332 3,534,960    
Accrued interest receivable 22,355 23,512    
Swaps 23,966 20,497    
Deposits:        
Noninterest-bearing 2,420,993 2,027,876    
Interest-bearing 2,354,126 2,577,825    
Borrowings 727,512 1,012,211    
Junior subordinated debentures 67,415 115,854    
Accrued interest payable 1,493 3,526    
Swaps $ 23,966 $ 20,497