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Loan Receivable and Allowance for Loan and Lease Losses Non-performing loans (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Mar. 31, 2012
Financing Receivable, Impaired [Line Items]    
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest $ 34,953 $ 54,588
One- to four family loans [Member]
   
Financing Receivable, Impaired [Line Items]    
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest 6,094 6,988
Multifamily Loans [Member]
   
Financing Receivable, Impaired [Line Items]    
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest 1,724 2,923
Commercial Real Estate Portfolio Segment [Member]
   
Financing Receivable, Impaired [Line Items]    
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest 14,145 24,467
Construction Loans [Member]
   
Financing Receivable, Impaired [Line Items]    
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest 4,258 11,325
Commercial Loan [Member]
   
Financing Receivable, Impaired [Line Items]    
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest 8,717 8,862
Consumer Loan [Member]
   
Financing Receivable, Impaired [Line Items]    
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest $ 15 $ 23