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Loans Receivable (excluding Covered Loans) (Changes in Accretable Yield for Acquired Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Carrying Amount, Accretion $ 1,619 $ 3,103
Credit Impaired Acquired Loans [Member]
    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretable Yield, Balance at beginning of period 0 0
Carrying Amount, Balance at beginning of period 0 0
Accretable Yield, Additions 21,384 0
Carrying Amount, Additions 93,691 0
Accretable Yield, Reclassifications from nonaccretable balance, net 0 0
Carrying Amount, Reclassifications from nonaccretable balance, net 0 0
Accretable Yield, Accretion (4,456) 0
Carrying Amount, Accretion 4,456 0
Accretable Yield, Transfers to Real Estate Owned 0 0
Carrying Amount, Transfers to Real Estate Owned (2,616) 0
Accretable Yield, Payments received, net 0 0
Carrying Amount, Payments received, net (17,918) 0
Accretable Yield, Balance at end of period 16,928 0
Carrying Amount, Balance at end of period $ 77,613 $ 0