Loan Receivable and Allowance for Loan and Lease Losses Non-performing loans (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	$ 14,922	$ 30,626
One- to four family loans [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	3,736	7,642
Multifamily Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	1,363	423
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	8,702	14,788
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	0	1,230
Business [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	1,120	6,505
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	$ 1	$ 38