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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets      
Total cash and cash equivalents $ 240,056 $ 94,693 $ 98,431
Interest-earning balances due from depository institutions 18,314 70,000  
FHLB stock 25,338 32,331  
Investment securities available-for-sale 3,160,056 2,663,642  
Investment securities held-to-maturity 1,598 1,777  
Non-covered loans held-for-sale   3,667  
Total loans, net of allowance for loan losses 3,514,303 3,310,681  
Accrued interest receivable 23,459 22,051  
Deposits:      
Noninterest-bearing 3,037,103 2,562,980  
Interest-bearing 2,722,190 2,327,651  
Junior subordinated debentures 25,774 25,774  
Accrued interest payable 1,120 1,111  
Swaps 538,141 654,097  
Carrying Value [Member]
      
Assets      
Total cash and cash equivalents 240,056 94,693  
Interest-earning balances due from depository institutions 18,314 70,000  
FHLB stock 25,338 32,331  
Investment securities available-for-sale 3,160,056 2,663,642  
Investment securities held-to-maturity 1,598 1,777  
Non-covered loans held-for-sale   3,667  
Total loans, net of allowance for loan losses 3,646,654 3,470,996  
Accrued interest receivable 23,459 22,051  
Swaps 9,317 10,846  
Deposits:      
Noninterest-bearing 3,037,103 2,562,980  
Interest-bearing 2,722,190 2,327,651  
Borrowings 728,234 911,457  
Junior subordinated debentures 25,774 25,774  
Accrued interest payable 1,120 1,111  
Swaps 9,317 10,846  
Estimated Fair Value [Member]
      
Assets      
Total cash and cash equivalents 240,056 94,693  
Interest-earning balances due from depository institutions 18,314 70,000  
FHLB stock 25,338 32,331  
Investment securities available-for-sale 3,160,056 2,663,642  
Investment securities held-to-maturity 2,194 2,296  
Non-covered loans held-for-sale   8,897  
Total loans, net of allowance for loan losses 3,680,071 3,527,725  
Accrued interest receivable 23,459 22,051  
Swaps 9,317 10,846  
Deposits:      
Noninterest-bearing 3,037,103 2,562,980  
Interest-bearing 2,723,117 2,328,488  
Borrowings 743,372 932,408  
Junior subordinated debentures 25,993 25,819  
Accrued interest payable 1,120 1,111  
Swaps 9,317 10,846  
Estimated Fair Value [Member] | Level 1 [Member]
      
Assets      
Total cash and cash equivalents 240,056 94,693  
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 3,037,103 2,562,980  
Interest-bearing        
Borrowings        
Junior subordinated debentures        
Accrued interest payable        
Swaps        
Estimated Fair Value [Member] | Level 2 [Member]
      
Assets      
Total cash and cash equivalents        
Interest-earning balances due from depository institutions 18,314 70,000  
FHLB stock 25,338 32,331  
Investment securities available-for-sale 3,160,056 2,663,642  
Investment securities held-to-maturity        
Non-covered loans held-for-sale        
Total loans, net of allowance for loan losses        
Accrued interest receivable 23,459 22,051  
Swaps 9,317 10,846  
Deposits:      
Noninterest-bearing        
Interest-bearing 2,723,117 2,328,488  
Borrowings 743,372 932,408  
Junior subordinated debentures 25,993 25,819  
Accrued interest payable 1,120 1,111  
Swaps 9,317 10,846  
Estimated Fair Value [Member] | 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 2,194 2,296  
Non-covered loans held-for-sale    8,897  
Total loans, net of allowance for loan losses 3,680,071 3,527,725  
Accrued interest receivable        
Swaps        
Deposits:      
Noninterest-bearing       
Interest-bearing        
Borrowings        
Junior subordinated debentures        
Accrued interest payable        
Swaps