Loan Receivable and Allowance for Loan and Lease Losses Past due financing receivable (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	$ 1,160	$ 3,823
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,621	1,313
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,549	8,988
Financing Receivable, Recorded Investment, Past Due	7,330	14,124
Financing Receivable, Recorded Investment, Current	403,105	375,832
Loans Receivable, Net	410,435	389,956
One- to four family loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	387	244
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	218	888
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2,545	1,863
Financing Receivable, Recorded Investment, Past Due	3,150	2,995
Financing Receivable, Recorded Investment, Current	115,992	109,196
Loans Receivable, Net	119,142	112,191
Multifamily Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	444
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,054	2,240
Financing Receivable, Recorded Investment, Past Due	1,054	2,684
Financing Receivable, Recorded Investment, Current	53,044	44,841
Loans Receivable, Net	54,098	47,525
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	767	3,133
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,357	292
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	377	3,891
Financing Receivable, Recorded Investment, Past Due	2,501	7,316
Financing Receivable, Recorded Investment, Current	188,072	190,785
Loans Receivable, Net	190,573	198,101
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Recorded Investment, Current	5,075	5,070
Loans Receivable, Net	5,075	5,070
Business [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	45	131
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	562	993
Financing Receivable, Recorded Investment, Past Due	607	1,124
Financing Receivable, Recorded Investment, Current	40,587	25,807
Loans Receivable, Net	41,194	26,931
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	6	2
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1	2
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	11	1
Financing Receivable, Recorded Investment, Past Due	18	5
Financing Receivable, Recorded Investment, Current	335	133
Loans Receivable, Net	$ 353	$ 138