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Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Financial Assets        
Cash and due from banks $ 94,488 $ 95,551 $ 78,070 $ 125,605
Securities available-for-sale 1,006,079 934,386    
Securities held-to-maturity 607,695 598,520    
Net loans 3,900,377 3,847,549    
Loans held for sale 10,641 5,855    
Accrued interest receivable 19,087 18,960    
Bank owned life insurance 121,878 121,390    
Financial Liabilities        
Deposits 5,117,403 5,062,530    
Federal Home Loan Bank borrowings 138,596 39,508    
Other borrowings 94,745 150,536    
Junior subordinated debt 106,156 106,137    
Accrued interest payable 2,306 2,354    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
       
Financial Assets        
Cash and due from banks 94,488 95,551    
Securities available-for-sale 10,558 9,962    
Securities held-to-maturity          
Net loans          
Loans held for sale          
Accrued interest receivable 19,087 18,960    
Bank owned life insurance 121,878 121,390    
Financial Liabilities        
Deposits 3,691,573 3,551,052    
Federal Home Loan Bank borrowings          
Other borrowings 68,475 104,196    
Junior subordinated debt          
Accrued interest payable 2,306 2,354    
Significant Other Observable Inputs (Level 2) [Member]
       
Financial Assets        
Cash and due from banks          
Securities available-for-sale 995,521 924,424    
Securities held-to-maturity 627,805 595,581    
Net loans          
Loans held for sale 10,641 5,855    
Accrued interest receivable          
Bank owned life insurance          
Financial Liabilities        
Deposits 1,435,949 1,525,155    
Federal Home Loan Bank borrowings 141,126 42,314    
Other borrowings 28,186 48,819    
Junior subordinated debt 77,075 74,038    
Accrued interest payable          
Significant Unobservable Inputs (Level 3) [Member]
       
Financial Assets        
Cash and due from banks          
Securities available-for-sale          
Securities held-to-maturity 735 727    
Net loans 3,784,772 3,754,465    
Loans held for sale          
Accrued interest receivable          
Bank owned life insurance          
Financial Liabilities        
Deposits          
Federal Home Loan Bank borrowings          
Other borrowings          
Junior subordinated debt          
Accrued interest payable          
Carrying Amount [Member]
       
Financial Assets        
Cash and due from banks 94,488 95,551    
Securities available-for-sale 1,006,079 934,386    
Securities held-to-maturity 607,695 598,520    
Net loans 3,900,377 3,847,549    
Loans held for sale 10,641 5,855    
Accrued interest receivable 19,087 18,960    
Bank owned life insurance 121,878 121,390    
Financial Liabilities        
Deposits 5,117,403 5,062,530    
Federal Home Loan Bank borrowings 138,596 39,508    
Other borrowings 94,745 150,536    
Junior subordinated debt 106,156 106,137    
Accrued interest payable 2,306 2,354    
Fair Value Estimate [Member]
       
Financial Assets        
Cash and due from banks 94,488 95,551    
Securities available-for-sale 1,006,079 934,386    
Securities held-to-maturity 628,540 596,308    
Net loans 3,784,772 3,754,465    
Loans held for sale 10,641 5,855    
Accrued interest receivable 19,087 18,960    
Bank owned life insurance 121,878 121,390    
Financial Liabilities        
Deposits 5,127,522 5,076,207    
Federal Home Loan Bank borrowings 141,126 42,314    
Other borrowings 96,661 153,015    
Junior subordinated debt 77,075 74,038    
Accrued interest payable $ 2,306 $ 2,354