Loans Receivable, Net - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Receivables [Abstract]
Loans in the amount	$ 45,900,000		$ 45,900,000		$ 43,374,000
Impaired loans on non-accrual commercial real estate, multi-family, land, construction and commercial loans			250,000
Impaired loan portfolio total	37,099,000		37,099,000		37,546,000
Allocation allowance for loan losses	3,436,000		3,436,000		2,554,000
Average balance of impaired loans	37,549,000	29,369,000	38,228,000	28,843,000
Troubled debt restructuring loans	34,758,000		34,758,000		35,893,000
Troubled debt restructuring loans with accrual interest	15,292,000		15,292,000		17,733,000
Non-accrual loan total troubled debt restructurings			19,466,000		18,160,000
Specific reserves to loans accruing troubled debt restructurings	2,503,000		2,503,000		2,418,000
Accruing loan total, additional troubled debt restructurings			15,292,000		17,733,000
Regulatory impact on non-accruing TDR			3,441,000		1,704,000
Regulatory impact on accruing TDR			$ 4,900,000		$ 6,291,000