Loans - Schedule of Portfolio of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable Allowance For Credit Losses [Line Items]
Total real estate	$ 915,864	$ 833,793
Total consumer	181,474	189,231
Total commercial	39,853	26,141
Ending balance	1,137,191	1,049,165
Allowance for loan losses	18,132	21,116
Deferred loan costs, net	(896)	(1,143)
Total	17,236	19,973
Loans, net	1,119,955	1,029,192
Secured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total commercial	39,685	25,714
Unsecured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total commercial	168	427
Auto [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total consumer	5,300	5,669
Home Equity [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total consumer	154,936	159,795
Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total real estate	9,487	9,683
One-to Four-Family Residential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total real estate	669,270	585,025
Multi-Family Residential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total real estate	56,445	54,485
Nonresidential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total real estate	123,260	131,251
One-to Four-Family Residential and Land Development [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total real estate	52,735	53,349
Multi-Family and Nonresidential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total real estate	4,667
Marine [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total consumer	4,003	4,308
Recreational Vehicles [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total consumer	15,249	17,347
Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total consumer	$ 1,986	$ 2,112