Past due financing receivable (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	$ 3,823	$ 2,135
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,313	3,699
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	8,988	28,030
Financing Receivable, Recorded Investment, Past Due	14,124	33,864
Financing Receivable, Recorded Investment, Current	375,832	336,258
Loans Receivable, Net	389,956	370,122
One- to four family loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	244	586
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	888	28
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,863	7,404
Financing Receivable, Recorded Investment, Past Due	2,995	8,018
Financing Receivable, Recorded Investment, Current	109,196	65,969
Loans Receivable, Net	112,191	73,987
Multifamily Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	444	238
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	1,142
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2,240	423
Financing Receivable, Recorded Investment, Past Due	2,684	1,803
Financing Receivable, Recorded Investment, Current	44,841	54,804
Loans Receivable, Net	47,525	56,607
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	3,133	1,044
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	292	846
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,891	13,964
Financing Receivable, Recorded Investment, Past Due	7,316	15,854
Financing Receivable, Recorded Investment, Current	190,785	186,917
Loans Receivable, Net	198,101	202,771
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	1,230
Financing Receivable, Recorded Investment, Past Due	0	1,230
Financing Receivable, Recorded Investment, Current	5,070	0
Loans Receivable, Net	5,070	1,230
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	261
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	131	1,682
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	993	4,971
Financing Receivable, Recorded Investment, Past Due	1,124	6,914
Financing Receivable, Recorded Investment, Current	25,807	28,363
Loans Receivable, Net	26,931	35,277
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	2	6
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	2	1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1	38
Financing Receivable, Recorded Investment, Past Due	5	45
Financing Receivable, Recorded Investment, Current	133	205
Loans Receivable, Net	$ 138	$ 250