Loan Receivable and Allowance for Loan and Lease Losses Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 4,107	$ 7,066	$ 4,477	$ 7,233	$ 7,233
Charge-off	283	0	864	83	1,286
Recoveries	105	244	198	941	1,540
Provision for loan losses	643	(713)	761	(1,494)	(3,010)
Allowance for loan losses	4,572	6,597	4,572	6,597	4,477
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,375	4,610	4,375	4,610	3,921
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	197	1,987	197	1,987	556
Loans Receivable Ending Balance	562,771	410,435	562,771	410,435	483,193
Financing Receivable, Collectively Evaluated for Impairment	547,072	393,419	547,072	393,419	466,681
Financing Receivable, Individually Evaluated for Impairment	15,699	17,016	15,699	17,016	16,512
One- to four family loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,659	3,923	1,989	3,377	3,377
Charge-off	(13)	0	(243)	(83)	(687)
Recoveries	1	25	1	379	380
Provision for loan losses	(52)	(647)	(152)	(372)	(1,081)
Allowance for loan losses	1,595	3,301	1,595	3,301	1,989
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,498	2,110	1,498	2,110	1,702
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	97	1,191	97	1,191	287
Loans Receivable Ending Balance	128,855	119,142	128,855	119,142	126,527
Financing Receivable, Collectively Evaluated for Impairment	121,925	112,350	121,925	112,350	119,480
Financing Receivable, Individually Evaluated for Impairment	6,930	6,792	6,930	6,792	7,047
Multifamily Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	525	336	534	308	308
Charge-off	(3)	0	(241)	0	0
Recoveries	0	74	0	82	83
Provision for loan losses	51	(38)	280	(18)	143
Allowance for loan losses	573	372	573	372	534
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	573	201	573	201	353
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	171	0	171	181
Loans Receivable Ending Balance	109,287	54,098	109,287	54,098	94,706
Financing Receivable, Collectively Evaluated for Impairment	108,046	52,606	108,046	52,606	93,218
Financing Receivable, Individually Evaluated for Impairment	1,241	1,492	1,241	1,492	1,488
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,032	813	1,029	1,835	1,835
Charge-off	0	0	0	0	0
Recoveries	3	53	3	254	256
Provision for loan losses	401	288	404	(935)	(1,062)
Allowance for loan losses	1,436	1,154	1,436	1,154	1,029
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,436	1,149	1,436	1,149	953
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	5	0	5	76
Loans Receivable Ending Balance	242,707	190,573	242,707	190,573	185,851
Financing Receivable, Collectively Evaluated for Impairment	240,845	186,324	240,845	186,324	183,230
Financing Receivable, Individually Evaluated for Impairment	1,862	4,249	1,862	4,249	2,621
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	99	201	99	0	0
Charge-off	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for loan losses	0	13	0	214	99
Allowance for loan losses	99	214	99	214	99
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	99	214	99	214	99
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Loans Receivable Ending Balance	5,067	5,075	5,067	5,075	5,076
Financing Receivable, Collectively Evaluated for Impairment	5,067	5,075	5,067	5,075	5,076
Financing Receivable, Individually Evaluated for Impairment	0	0	0	0	0
Business [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	791	1,780	813	1,705	1,705
Charge-off	(8)	0	(120)	0	(320)
Recoveries	95	90	188	223	816
Provision for loan losses	(35)	(335)	(38)	(393)	(1,388)
Allowance for loan losses	843	1,535	843	1,535	813
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	743	916	743	916	801
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	100	619	100	619	12
Loans Receivable Ending Balance	76,766	41,194	76,766	41,194	70,599
Financing Receivable, Collectively Evaluated for Impairment	71,100	36,721	71,100	36,721	65,243
Financing Receivable, Individually Evaluated for Impairment	5,666	4,473	5,666	4,473	5,356
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1	13	13	8	8
Charge-off	(259)	0	(260)	0	(279)
Recoveries	6	2	6	3	5
Provision for loan losses	278	6	267	10	279
Allowance for loan losses	26	21	26	21	13
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	26	20	26	20	13
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	1	0	1	0
Loans Receivable Ending Balance	89	353	89	353	434
Financing Receivable, Collectively Evaluated for Impairment	89	343	89	343	434
Financing Receivable, Individually Evaluated for Impairment	$ 0	$ 10	$ 0	$ 10	$ 0