Loan Receivable and Allowance for Loan and Lease Losses Non-performing loans (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	$ 18,140	$ 30,626
One- to four family loans [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	4,343	7,642
Multifamily Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	758	423
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	10,503	14,788
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	75	1,230
Business [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	2,457	6,505
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	$ 4	$ 38