Loan Receivable and Allowance for Loan and Lease Losses Non performing TDRs (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	$ 35,566	$ 54,588
Mortgage Loans on Real Estate, Number of Loans	8
Pre-modifcation Outstanding Recorded Investment	4,718
Loan modifications recorded investment	3,806
One- to four family loans [Member]
Financing Receivable, Modifications [Line Items]
Mortgage Loans on Real Estate, Number of Loans	2
Pre-modifcation Outstanding Recorded Investment	1,415
Loan modifications recorded investment	536
weighted average rate pre modification	6.52%
Weighted average rate post modification	6.31%
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Mortgage Loans on Real Estate, Number of Loans	2
Pre-modifcation Outstanding Recorded Investment	1,061
Loan modifications recorded investment	1,060
weighted average rate pre modification	12.02%
Weighted average rate post modification	12.02%
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Mortgage Loans on Real Estate, Number of Loans	4
Pre-modifcation Outstanding Recorded Investment	2,242
Loan modifications recorded investment	$ 2,210
weighted average rate pre modification	7.44%
Weighted average rate post modification	7.44%