Commitments and Contingencies Repurchase request (Details) $ in Thousands		12 Months Ended
		Mar. 31, 2015 USD ($)
Repurchase request [Abstract]
Principal payments received on open claims		$ (30)
Open claims, beginning balance		2,075
Gross new demands received		129
Loan repurchased/made whole		(129)
Open claims, ending balance	[1]	$ 2,045

[1] (1) The open claims include all open requests received by the Bank where either FNMA has requested loan files for review, where FNMA has not formally rescinded the repurchase request or where the Bank has not agreed to repurchase the loan. The amounts reflected in this table are the unpaid principal balance and do not incorporate any losses the Bank would incur upon the repurchase of these loans.