Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)	6 Months Ended					6 Months Ended		3 Months Ended	6 Months Ended
	Dec. 31, 2012 SecurityLoan	Jun. 30, 2012 SecurityLoan	Dec. 31, 2012 Troubled debt restructurings [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Consumer [Member]	Jun. 30, 2012 Consumer [Member]	Dec. 31, 2012 New commercial participations [Member] Borrowers	Dec. 31, 2012 Home Equity Lines Of Credit [Member]	Dec. 31, 2012 One-to-Four Family [Member] SecurityLoan	Jun. 30, 2012 One-to-Four Family [Member] SecurityLoan	Dec. 31, 2011 One-to-Four Family [Member] SecurityLoan	Dec. 31, 2012 Multi-Family [Member]	Jun. 30, 2012 Multi-Family [Member] SecurityLoan	Dec. 31, 2011 Multi-Family [Member] SecurityLoan	Dec. 31, 2012 Consumer Auto Loans [Member] SecurityLoan	Jun. 30, 2012 Consumer Auto Loans [Member] SecurityLoan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for sale
Maximum amount of one-to-four family residential mortgage loans can be approved by loan officer	100,000
Maximum amount of other secured loans residential mortgage loans can be approved by loan officer	50,000
Maximum amount of unsecured loans residential mortgage loans can be approved by loan officer	10,000
Maximum amount of one-to-four family residential mortgage loans can be approved by managing officer	300,000
Maximum amount other secured loans residential mortgage loans can be approved by managing officer	300,000
Maximum amount of one-to-four family residential mortgage loans can be approved by managing officer	150,000
Maximum amount of unsecured loans residential mortgage loans can be approved by loan committee	500,000
Maximum aggregate loan amount of one-to-four family residential mortgage loans commercial real estate loans, multi-family real estate loans and land loans can be approved by loan committee	1,000,000
Maximum individual loan amount of one-to-four family residential mortgage loans commercial real estate loans multi family real estate loans and land loans can be approved by loan committee	750,000
Maximum term of the fixed-rate one-to-four family residential mortgage loans	15 years
Consumer loans term in years						7 years
Unsecured loans are limited to period						12 months
Commercial Real Estate	58,633,000	32,925,000				108,498,000	71,472,000	19,918,000
Approximate amount of purchase loans included in loans receivable						16,878,000	17,248,000
Approximate amount of loans included on out-of-area participation						27,861,000	16,229,000
Amount within 100 miles of primary area						9,825,000	7,300,000
Number of borrowers								4
HELOC portfolio									2,400,000
Loan to value ratios				81.00%	90.00%
Present allowance qualitative factors	0.53%
Weighted average loss factor	0.37%
Accrual of interest on loans due discontinued period, in days	90 days
Troubled debt restructurings, Impaired loans	3,634,000	3,753,000	3,200,000							2,066,000	2,146,000		1,416,000	1,478,000
Loans listed that were on nonaccrual	423,000	310,000								324,000	368,000
Investment recorded prior to modification	41,000										949,000	1,600,000		1,500,000	1,100,000		8,000
Number of loans											13	13		1	1		1
Number of default loans	3	2								3	2					3
Performance of troubled debt restructuring in accordance with modified terms	$ 324,000										$ 368,000