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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Assets        
Total cash and cash equivalents $ 421,386 $ 94,693 $ 135,278 $ 98,431
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 25,560 32,331    
Investment securities available-for-sale 2,750,063 2,663,642    
Investment securities held-to-maturity 1,730 1,777    
Non-covered loans held-for-sale   3,667    
Total loans, net of allowance for loan losses 3,188,834 3,310,681    
Accrued interest receivable 21,775 22,051    
Deposits:        
Noninterest-bearing 2,688,585 2,562,980    
Interest-bearing 2,422,201 2,327,651    
Junior subordinated debentures 25,774 25,774    
Accrued interest payable 1,083 1,111    
Swaps 637,476 654,097    
Level 1 [Member]
        
Assets        
Total cash and cash equivalents 421,386 94,693    
Non-covered loans held-for-sale         
Deposits:        
Noninterest-bearing 2,688,585 2,562,980    
Level 2 [Member]
        
Assets        
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 25,560 32,331    
Investment securities available-for-sale 2,750,063 2,663,642    
Non-covered loans held-for-sale         
Accrued interest receivable 21,775 22,051    
Swaps 10,674 10,846    
Deposits:        
Interest-bearing 2,423,139 2,328,488    
Borrowings 844,486 932,408    
Junior subordinated debentures 25,762 25,819    
Accrued interest payable 1,083 1,111    
Swaps 10,674 10,846    
Level 3 [Member]
        
Assets        
Investment securities held-to-maturity 2,291 2,296    
Non-covered loans held-for-sale    8,897    
Total loans, net of allowance for loan losses 3,387,259 3,527,725    
Carrying Value [Member]
        
Assets        
Total cash and cash equivalents 421,386 94,693    
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 25,560 32,331    
Investment securities available-for-sale 2,750,063 2,663,642    
Investment securities held-to-maturity 1,730 1,777    
Non-covered loans held-for-sale    3,667    
Total loans, net of allowance for loan losses 3,334,147 3,470,996    
Accrued interest receivable 21,775 22,051    
Swaps 10,674 10,846    
Deposits:        
Noninterest-bearing 2,688,585 2,562,980    
Interest-bearing 2,422,201 2,327,651    
Borrowings 826,076 911,457    
Junior subordinated debentures 25,774 25,774    
Accrued interest payable 1,083 1,111    
Swaps 10,674 10,846    
Estimated Fair Value [Member]
        
Assets        
Total cash and cash equivalents 421,386 94,693    
Interest-earning balances due from depository institutions 70,000 70,000    
FHLB stock 25,560 32,331    
Investment securities available-for-sale 2,750,063 2,663,642    
Investment securities held-to-maturity 2,291 2,296    
Non-covered loans held-for-sale    8,897    
Total loans, net of allowance for loan losses 3,387,259 3,527,725    
Accrued interest receivable 21,775 22,051    
Swaps 10,674 10,846    
Deposits:        
Noninterest-bearing 2,688,585 2,562,980    
Interest-bearing 2,423,139 2,328,488    
Borrowings 844,486 932,408    
Junior subordinated debentures 25,762 25,819    
Accrued interest payable 1,083 1,111    
Swaps $ 10,674 $ 10,846