Loans receivable, net of allowance for loan losses (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Mar. 31, 2015		Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		$ 584,294	$ 482,051	[1]
Percentage of Loan Type		100.00%	100.00%
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums		$ 4,725	$ 1,711
Allowance for loan losses		(5,232)	(4,428)	[2],[3],[4]	$ (7,366)	[4]
Loans and Leases Receivable, Net Reported Amount		583,787	479,334	[5],[6]
Loans Receivable Held-for-sale, Amount		2,495	2,724	[2]
Loans Held-for-sale, Fair Value Disclosure		2,495			2,724	[7]
One-to-four family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		$ 141,243	$ 125,549	[1]
Percentage of Loan Type		24.00%	26.00%
Allowance for loan losses		$ (1,697)	$ (1,970)		(3,396)	[8]
Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		$ 94,202	$ 93,692	[1]
Percentage of Loan Type		16.00%	19.00%
Allowance for loan losses		$ (622)	$ (502)		(422)
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		$ 272,497	$ 186,504	[1]
Percentage of Loan Type		47.00%	39.00%
Allowance for loan losses		$ (1,808)	$ (1,029)		(1,835)
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		$ 5,033	$ 5,107
Percentage of Loan Type		1.00%	1.00%
Allowance for loan losses		$ (62)	$ (99)		0
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		$ 71,277	$ 70,765	[3]
Percentage of Loan Type		12.00%	15.00%
Allowance for loan losses		$ (1,022)	$ (813)		(1,705)
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	[9]	$ 42	$ 434
Percentage of Loan Type	[9]	0.00%	0.00%
Allowance for loan losses		$ (21)	$ (15)	[4]	$ (8)

[1] (1) March 31, 2015 and 2014 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[2] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[3] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[4] (2) March 31, 2015 balances have been restated from previously reported results for the $701 thousand reclassification of negative escrow balances from Other Assets to Loans Receivable a

[5] (1) March 31, 2015 has been restated to correct the classification of loans held-for-sale and other real estate owned from Level 2 to Level 3 assets and for the reclassification of negative escrow balances from Other Assets to Loans Held-for-Sale.

[6] 1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[7] (1) March 31, 2015 balance has been been restated from previously reported amounts to correct for the classification of $981 thousand of interest-bearing deposits from available-for-sale securities to other assets, and the reclassification of negative escrow balances from Other Assets to Loans Receivable and Loans Held-for-Sale.

[8] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[9] Includes personal loans