Loan Receivable and Allowance for Loan and Lease Losses Credit Risk Profile Internal Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	$ 533,291	$ 589,019
Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	72,074	95,648
Multifamily [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	70,471	93,879
Multifamily [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Multifamily [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	1,603	1,769
Multifamily [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Multifamily [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	250,880	273,470
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	245,243	262,937
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	1,166	4,239
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	4,471	6,294
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Commercial Real Estate Portfolio Segment [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	4,962	5,000
Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	4,962	5,000
Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Construction Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Construction Loans [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	66,439	71,192
Commercial Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	57,669	61,331
Commercial Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	841	2,039
Commercial Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	7,929	7,822
Commercial Loan [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Commercial Loan [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	138,634	143,667
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	135,168	140,720
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	3,466	2,947
Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	302	42
Consumer Loan [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	299	42
Consumer Loan [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	$ 3	$ 0