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, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015		Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 4,747	$ 4,439	$ 5,232	$ 4,428		$ 4,428
Charge-off	54	148	408	1,012		1,422
Recoveries	55	155	288	353		731
Provision for loan losses	(128)	728	(492)	1,405	[1]	1,495
Allowance for loan losses	4,620	5,174	4,620	5,174		5,232
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,281	4,977	4,281	4,977		4,642
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	339	197	339	197		590
Loans Receivable Ending Balance	533,291	602,077	533,291	602,077		589,019
Financing Receivable, Collectively Evaluated for Impairment	516,145	585,358	516,145	585,358		569,454
Financing Receivable, Individually Evaluated for Impairment	17,146	16,719	17,146	16,719		19,565
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,654	1,576	1,697	1,970		1,970
Charge-off	4	77	66	320		389
Recoveries	0	0	0	1		113
Provision for loan losses	(33)	131	(14)	(21)		3
Allowance for loan losses	1,617	1,630	1,617	1,630		1,697
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,369	1,533	1,369	1,533		1,602
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	248	97	248	97		95
Loans Receivable Ending Balance	138,634	146,179	138,634	146,179		143,667
Financing Receivable, Collectively Evaluated for Impairment	133,111	141,483	133,111	141,483		139,031
Financing Receivable, Individually Evaluated for Impairment	5,523	4,696	5,523	4,696		4,636
Multifamily [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	672	457	622	502		502
Charge-off	37	0	288	241		340
Recoveries	0	68	0	68		0
Provision for loan losses	54	87	355	283		460
Allowance for loan losses	689	612	689	612		622
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	689	612	689	612		622
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0		0
Loans Receivable Ending Balance	72,074	106,275	72,074	106,275		95,648
Financing Receivable, Collectively Evaluated for Impairment	70,471	105,046	70,471	105,046		93,879
Financing Receivable, Individually Evaluated for Impairment	1,603	1,229	1,603	1,229		1,769
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,743	1,436	1,808	1,029		1,029
Charge-off	0	0	0	0		0
Recoveries	4	1	14	4		9
Provision for loan losses	(180)	470	(255)	874		770
Allowance for loan losses	1,567	1,907	1,567	1,907		1,808
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,537	1,907	1,537	1,907		1,787
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	30	0	30	0		21
Loans Receivable Ending Balance	250,880	267,547	250,880	267,547		273,470
Financing Receivable, Collectively Evaluated for Impairment	246,409	262,261	246,409	262,261		267,176
Financing Receivable, Individually Evaluated for Impairment	4,471	5,286	4,471	5,286		6,294
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	50	99	62	99		99
Charge-off	0	0	0	0		0
Recoveries	0	0	0	0		0
Provision for loan losses	70	(1)	58	(1)		(37)
Allowance for loan losses	120	98	120	98		62
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	120	98	120	98		62
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0		0
Loans Receivable Ending Balance	4,962	5,012	4,962	5,012		5,000
Financing Receivable, Collectively Evaluated for Impairment	4,962	5,012	4,962	5,012		5,000
Financing Receivable, Individually Evaluated for Impairment	0	0	0	0		0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	577	843	1,022	813		813
Charge-off	0	43	0	163		176
Recoveries	51	59	270	247		578
Provision for loan losses	(29)	26	(693)	(12)		(193)
Allowance for loan losses	599	885	599	885		1,022
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	541	785	541	785		548
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	58	100	58	100		474
Loans Receivable Ending Balance	66,439	76,979	66,439	76,979		71,192
Financing Receivable, Collectively Evaluated for Impairment	60,893	71,471	60,893	71,471		64,326
Financing Receivable, Individually Evaluated for Impairment	5,546	5,508	5,546	5,508		6,866
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	2	28	21	15		15
Charge-off	13	28	54	288		517
Recoveries	0	27	4	33		31
Provision for loan losses	39	15	57	282		492
Allowance for loan losses	28	42	28	42		21
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	25	42	25	42		21
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3	0	3	0		0
Loans Receivable Ending Balance	302	85	302	85		42
Financing Receivable, Collectively Evaluated for Impairment	299	85	299	85		42
Financing Receivable, Individually Evaluated for Impairment	3	$ 0	3	$ 0		0
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	49		0
Charge-off	0		0
Recoveries	0		0
Provision for loan losses	(49)		0
Allowance for loan losses	0		0			$ 0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	0		0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Loans Receivable Ending Balance	0		0
Financing Receivable, Collectively Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	$ 0		$ 0

[1] (1) December 31, 2015 amounts have been restated from previously reported results to correct for a material and certain other errors from prior periods. Refer to Note 1 for further detail.