Loan Receivable and Allowance for Loan and Lease Losses Credit Risk Profile Internal Grade (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	$ 491,890	$ 483,193
Multifamily Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	97,366	94,706
Multifamily Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	96,119	93,218
Multifamily Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Multifamily Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	1,247	1,488
Multifamily Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Multifamily Loans [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	195,408	185,851
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	190,574	181,340
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	2,232	1,890
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	2,602	2,621
Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Commercial Real Estate [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	5,065	5,076
Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	5,065	5,076
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
Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	72,783	70,599
Business [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	64,933	62,419
Business [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	1,056	1,065
Business [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	6,794	7,115
Business [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
Business [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	0	0
One- to four family loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	121,165	126,527
One- to four family loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	117,511	122,689
One- to four family loans [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	3,654	3,838
Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	103	434
Consumer Loan [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	103	434
Consumer Loan [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Net	$ 0	$ 0