Loans Receivable, Net - Components of Loans Receivable, Net (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Consumer	$ 201,839		$ 200,683
Commercial and industrial	75,215		60,545
Total loans	1,665,673		1,571,579
Loans in process	(16,374)		(12,715)
Deferred origination costs, net	3,456		3,526
Allowance for loan losses	(20,936)	(20,934)	(20,930)	(20,820)	(20,494)	(20,510)
Loans receivable, net	1,631,819		1,541,460
One-to-Four Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Real estate	765,466		750,585
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Real estate	577,061		528,945
Total loans	577,061		528,945
Allowance for loan losses	(11,077)	(11,413)	(10,371)	(9,774)	(9,286)	(8,937)
Residential Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Real estate	$ 46,092		$ 30,821