Loans and Allowance for Loan Losses - Credit Risk Profile of Association's Loan Portfolio Based on Rating Category and Payment Activity (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 434,952	$ 360,560	$ 342,630
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	422,945	351,365
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,725	2,753
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,282	6,442
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	114,458	103,614	92,479
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	110,518	99,487
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,576	748
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	364	3,379
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	55,878	37,151	32,125
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	53,347	36,054
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,518	1,076
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13	21
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,164	8,325	8,600
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,147	8,304
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17	21
One-to Four-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	148,797	144,887	145,053
One-to Four-Family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	145,250	141,355
One-to Four-Family [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	353	759
One-to Four-Family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,194	2,773
Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	84,170	58,399	56,147
Multi-Family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	82,530	57,989
Multi-Family [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,278	170
Multi-Family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	362	240
Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,197	7,713	7,825
Home Equity Lines of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,865	7,705
Home Equity Lines of Credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	332	8
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,288	471	$ 401
Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 14,288	$ 471