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Loans Receivable (excluding Covered Loans) (Schedule of Changes in the Accretable Yield for Credit Impaired Acquired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Jun. 30, 2012
Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accretion, Carrying Amount of Loans $ 1,303 $ 3,103
Credit Impaired Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period, AccretableYield 0  
Balance at beginning of period, Carrying Amount of Loans 0  
Additions, AccretableYield 21,606  
Additions, Carrying Amount of Loans 92,981  
Accretion, AccretableYield (3,278)  
Accretion, Carrying Amount of Loans 3,278  
Transfers to REO, AccretableYield 0  
Transfers to REO, Carrying Amount of Loans 0  
Payments received, net, AccretableYield 0  
Payments received, net, Carrying Amount of Loans (12,714)  
Balance at end of period, AccretableYield 18,328  
Balance at end of period, Carrying Amount of Loans $ 83,545