Loans Receivable, Net - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans with non-accrual of interest	$ 20,905,000		$ 20,905,000		$ 18,307,000
Financing receivables 90 days past due and still accruing	0		0
Impaired loans on non-accrual commercial real estate, multi-family, land, construction and commercial loans			250,000
Impaired loan portfolio total	43,558,000		43,558,000		36,979,000
Allocation in allowance for loan losses	2,106,000		2,106,000		2,161,000
Average balance of impaired loans	42,584,000	$ 42,835,000	39,764,000	$ 42,402,000
Troubled debt restructuring loans	31,450,000		31,450,000		23,493,000
Troubled debt restructuring loans with accrual interest	27,618,000		27,618,000		21,462,000
Non-accrual loan total troubled debt restructurings	3,832,000				2,031,000
Specific reserves to loans accruing troubled debt restructurings	482,000		482,000		$ 419,000
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount	3,320,000		3,320,000
Foreclosed property held	3,313,000		3,313,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructurings	$ 3,900,000		$ 3,900,000