Loans and Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans Based on Portfolio Segment and Impairment Method (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012
Allowance for loan losses:
Balance, beginning of period	$ 3,672	$ 3,020	$ 3,531	$ 3,149	$ 3,149
Provision charged to expense	405	195	507	334	1,125
Losses charged off	(114)	(143)	(117)	(433)	(851)
Recoveries	2	36	44	58	108
Balance, end of period	3,965	3,108	3,965	3,108	3,531
Ending balance: individually evaluated for impairment	1,060	809	1,060	809	1,028
Ending balance: collectively evaluated for impairment	2,905	2,299	2,905	2,299	2,503
Loans:
Ending balance	289,656	251,639	289,656	251,639	264,043
Ending balance: individually evaluated for impairment	5,925	6,877	5,925	6,877	5,466
Ending balance: collectively evaluated for impairment	283,731	244,763	283,731	244,763	258,577
Construction [Member]
Allowance for loan losses:
Balance, beginning of period	22	39	78	30	30
Provision charged to expense	4	8	(52)	17	48
Losses charged off
Recoveries
Balance, end of period	26	47	26	47	78
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	26	47	26	47	78
Loans:
Ending balance	3,735	5,017	3,735	5,017	8,396
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	3,735	5,017	3,735	5,017	8,396
Commercial [Member]
Allowance for loan losses:
Balance, beginning of period	336	315	347	352	352
Provision charged to expense	15	68	4	31	24
Losses charged off	(50)		(50)		(29)
Recoveries
Balance, end of period	301	383	301	383	347
Ending balance: individually evaluated for impairment	6	23	6	23	1
Ending balance: collectively evaluated for impairment	295	360	295	360	346
Loans:
Ending balance	12,484	13,535	12,484	13,535	13,917
Ending balance: individually evaluated for impairment	41	39	41	39	2
Ending balance: collectively evaluated for impairment	12,443	13,496	12,443	13,496	13,915
Consumer [Member]
Allowance for loan losses:
Balance, beginning of period	138	190	139	169	169
Provision charged to expense	34	(4)	34	43	21
Losses charged off	(29)	(32)	(32)	(60)	(88)
Recoveries	1	29	3	31	37
Balance, end of period	144	183	144	183	139
Ending balance: individually evaluated for impairment	53	64	53	64	41
Ending balance: collectively evaluated for impairment	91	119	91	119	98
Loans:
Ending balance	10,852	14,865	10,852	14,865	13,578
Ending balance: individually evaluated for impairment	112	177	112	177	113
Ending balance: collectively evaluated for impairment	10,740	14,688	10,740	14,688	13,465
Unallocated [Member]
Allowance for loan losses:
Balance, beginning of period	28	12	22	9	9
Provision charged to expense	(9)	7	(3)	10	13
Losses charged off
Recoveries
Balance, end of period	19	19	19	19	22
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	19	19	19	19	22
Loans:
Ending balance
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment
One-to-Four Family [Member]
Allowance for loan losses:
Balance, beginning of period	1,939	1,852	1,940	1,987	1,987
Provision charged to expense	80	30	39	137	533
Losses charged off	(35)	(62)	(35)	(324)	(651)
Recoveries	1	7	41	27	71
Balance, end of period	1,985	1,827	1,985	1,827	1,940
Ending balance: individually evaluated for impairment	687	641	687	641	684
Ending balance: collectively evaluated for impairment	1,298	1,186	1,298	1,186	1,256
Loans:
Ending balance	145,544	148,056	145,544	148,056	147,686
Ending balance: individually evaluated for impairment	3,900	4,967	3,900	4,967	3,778
Ending balance: collectively evaluated for impairment	141,644	143,089	141,644	143,089	143,908
Multi-Family [Member]
Allowance for loan losses:
Balance, beginning of period	694	270	679	250	250
Provision charged to expense	118	50	133	70	429
Losses charged off
Recoveries
Balance, end of period	812	320	812	320	679
Ending balance: individually evaluated for impairment	231	16	231	16	253
Ending balance: collectively evaluated for impairment	581	304	581	304	426
Loans:
Ending balance	49,865	30,482	49,865	30,482	38,547
Ending balance: individually evaluated for impairment	1,708	1,556	1,708	1,556	1,478
Ending balance: collectively evaluated for impairment	48,157	28,926	48,157	28,926	37,069
Commercial [Member]
Allowance for loan losses:
Balance, beginning of period	416	228	245	232	232
Provision charged to expense	150	55	321	51	61
Losses charged off		(49)		(49)	(48)
Recoveries
Balance, end of period	566	234	566	234	245
Ending balance: individually evaluated for impairment	48	56	48	56	49
Ending balance: collectively evaluated for impairment	518	178	518	178	196
Loans:
Ending balance	58,633	30,052	58,633	30,052	32,925
Ending balance: individually evaluated for impairment	109	101	109	101	95
Ending balance: collectively evaluated for impairment	58,524	29,951	58,524	29,951	32,830
Home Equity Lines of Credit [Member]
Allowance for loan losses:
Balance, beginning of period	99	114	81	120	120
Provision charged to expense	13	(19)	31	(25)	(4)
Losses charged off					(35)
Recoveries
Balance, end of period	112	95	112	95	81
Ending balance: individually evaluated for impairment	35	9	35	9
Ending balance: collectively evaluated for impairment	77	86	77	86	81
Loans:
Ending balance	8,543	9,632	8,543	9,632	8,994
Ending balance: individually evaluated for impairment	55	37	55	37
Ending balance: collectively evaluated for impairment	$ 8,488	$ 9,595	$ 8,488	$ 9,595	$ 8,994