Commitments and Contingencies Repurchase request (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pending Repurchase Request by counterparty [Line Items]
Open claims, begining balance	$ 4,851	$ 0
Gross new demands received	8,576
Loan repurchased/made whole	(3,725)
Demands rescinded	$ 0