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Loans Receivable, Net - Components of Loans Receivable, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]            
Consumer $ 199,842   $ 200,683      
Commercial and industrial 79,608   60,545      
Total loans 1,659,085   1,571,579      
Loans in process (14,180)   (12,715)      
Deferred origination costs, net 3,431   3,526      
Allowance for loan losses (16,310) (20,936) (20,930) (20,887) (20,820) (20,510)
Loans receivable, net 1,632,026   1,541,460      
One-to-Four Family [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Real estate 738,575   750,585      
Commercial Real Estate [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Real estate 599,917   528,945      
Total loans 599,917   528,945      
Allowance for loan losses (8,244) (11,077) (10,371) (9,446) (9,774) (8,937)
Residential Construction [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Real estate $ 41,143   $ 30,821