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Loans Receivable (excluding Covered Loans) (Schedule of Changes in the Accretable Yield for Acquired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Mar. 31, 2013
Credit Impaired Acquired Loans [Member]
Sep. 30, 2012
Credit Impaired Acquired Loans [Member]
Mar. 31, 2013
Acquired Non-Impaired Loans [Member]
Sep. 30, 2012
Acquired Non-Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]            
Balance at beginning of period, AccretableYield     $ 16,928 $ 0 $ 0 $ 0
Balance at beginning of period, Carrying Amount of Loans     77,613 0 0 0
Reclassification from nonaccretable balance, net, AccretableYield     30,026 [1]      
Additions, AccretableYield     0 [1] 21,384 [2] 10,804 [1] 0 [2]
Additions, Carrying Amount of Loans     0 [1] 93,691 [2] 360,719 [1] 0 [2]
Accretion, AccretableYield     (4,278) (4,456) (658) 0
Accretion, Carrying Amount of Loans 566 1,619 4,278 4,456 658 0
Transfers to REO, AccretableYield     0 0 0 0
Transfers to REO, Carrying Amount of Loans     (3,120) (2,616) (2,681) 0
Payments received, net, AccretableYield     0 0 0 0
Payments received, net, Carrying Amount of Loans     (11,233) (17,918) (39,752) 0
Balance at end of period, AccretableYield     42,676 16,928 10,146 0
Balance at end of period, Carrying Amount of Loans     $ 67,538 $ 77,613 $ 318,944 $ 0
[1] includes acquired loans which were acquired as part of the South Valley acquisition.
[2] includes acquired impaired loans which were acquired as part of the WNB acquisition.