Loan Receivable and Allowance for Loan and Lease Losses Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 4,572	$ 6,597	$ 4,477	$ 7,233	$ 7,233
Charge-off	212	112	1,076	195	1,286
Recoveries	86	546	284	1,487	1,540
Provision for loan losses	728	(1,151)	1,489	(2,645)	(3,010)
Allowance for loan losses	5,174	5,880	5,174	5,880	4,477
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,998	4,523	4,998	4,523	3,921
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	176	1,357	176	1,357	556
Loans Receivable Ending Balance	601,576	435,534	601,576	435,534	483,193
Financing Receivable, Collectively Evaluated for Impairment	584,857	418,276	584,857	418,276	466,681
Financing Receivable, Individually Evaluated for Impairment	16,719	17,258	16,719	17,258	16,512
One- to four family loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,595	3,301	1,989	3,377	3,377
Charge-off	77	112	320	195	687
Recoveries	0	0	1	379	380
Provision for loan losses	113	225	(39)	(147)	(1,081)
Allowance for loan losses	1,631	3,414	1,631	3,414	1,989
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,533	2,515	1,533	2,515	1,702
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	97	899	97	899	287
Loans Receivable Ending Balance	145,980	127,417	145,980	127,417	126,527
Financing Receivable, Collectively Evaluated for Impairment	141,284	120,367	141,284	120,367	119,480
Financing Receivable, Individually Evaluated for Impairment	4,696	7,050	4,696	7,050	7,047
Multifamily Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	573	372	534	308	308
Charge-off	64	0	305	0	0
Recoveries	0	0	0	82	83
Provision for loan losses	104	(19)	384	(37)	143
Allowance for loan losses	613	353	613	353	534
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	612	172	612	172	353
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	181	0	181	181
Loans Receivable Ending Balance	106,184	64,138	106,184	64,138	94,706
Financing Receivable, Collectively Evaluated for Impairment	104,955	62,648	104,955	62,648	93,218
Financing Receivable, Individually Evaluated for Impairment	1,229	1,490	1,229	1,490	1,488
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,436	1,154	1,029	1,835	1,835
Charge-off	0	0	0	0	0
Recoveries	1	2	4	256	256
Provision for loan losses	470	(291)	874	(1,226)	(1,062)
Allowance for loan losses	1,907	865	1,907	865	1,029
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,895	832	1,895	832	953
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	12	32	12	32	76
Loans Receivable Ending Balance	267,448	200,334	267,448	200,334	185,851
Financing Receivable, Collectively Evaluated for Impairment	262,162	196,229	262,162	196,229	183,230
Financing Receivable, Individually Evaluated for Impairment	5,286	4,105	5,286	4,105	2,621
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	99	214	99	0	0
Charge-off	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for loan losses	(1)	(53)	(1)	161	99
Allowance for loan losses	98	161	98	161	99
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	98	161	98	161	99
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Loans Receivable Ending Balance	5,012	5,074	5,012	5,074	5,076
Financing Receivable, Collectively Evaluated for Impairment	5,012	5,074	5,012	5,074	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	843	1,535	813	1,705	1,705
Charge-off	43	0	163	0	320
Recoveries	59	540	247	763	816
Provision for loan losses	26	(1,004)	(12)	(1,397)	(1,388)
Allowance for loan losses	885	1,071	885	1,071	813
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	820	828	820	828	801
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	67	244	67	244	12
Loans Receivable Ending Balance	76,867	38,244	76,867	38,244	70,599
Financing Receivable, Collectively Evaluated for Impairment	71,359	33,638	71,359	33,638	65,243
Financing Receivable, Individually Evaluated for Impairment	5,508	4,606	5,508	4,606	5,356
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	26	21	13	8	8
Charge-off	28	0	288	0	279
Recoveries	26	4	32	7	5
Provision for loan losses	16	(9)	283	1	279
Allowance for loan losses	40	16	40	16	13
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	40	15	40	15	13
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	1	0	1	0
Loans Receivable Ending Balance	85	327	85	327	434
Financing Receivable, Collectively Evaluated for Impairment	85	320	85	320	434
Financing Receivable, Individually Evaluated for Impairment	$ 0	$ 7	$ 0	$ 7	$ 0