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Covered Assets (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Mar. 31, 2012
Sep. 30, 2011
Covered assets $ 357,443 $ 438,566
Loans and Leases Receivable, Covered Loans, Gross 422,647 495,358
Discount balance related to acquired loans (97,247) (109,409)
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Balance at beginning of period 101,634 131,128
Additions 2,052 10,470
Payments made (received) 4,068 (32,828)
Amortization (7,869) (10,239)
Accretion, Carrying Amount of Loans 990 3,103
Balance at end of period 100,875 101,634
Acquired Impaired Assets [Member]
    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period, AccretableYield 37,072 27,019
Balance at beginning of period, Carrying Amount of Loans 116,061 190,530
Reclassification from nonaccretable balance, net, AccretableYield   24,025
Reclassification from nonaccretable balance, net, Carrying Amount of Loans   0
Accretion, AccretableYield (10,404) (13,972)
Transfers to REO, AccretableYield 0 0
Transfers to REO, Carrying Amount of Loans (11,775) (54,638)
Payments received, net, AccretableYield 0 0
Payments received, net, Carrying Amount of Loans (29,141) (33,803)
Balance at end of period, AccretableYield 26,668 37,072
Balance at end of period, Carrying Amount of Loans 85,549 116,061
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion, Carrying Amount of Loans 10,404 13,972
Acquired Non Impaired Assets [Member]
    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period, AccretableYield 30,370 39,813
Balance at beginning of period, Carrying Amount of Loans 269,888 343,944
Reclassification from nonaccretable balance, net, AccretableYield   0
Reclassification from nonaccretable balance, net, Carrying Amount of Loans   0
Accretion, AccretableYield (3,965) (9,443)
Transfers to REO, AccretableYield 0 0
Transfers to REO, Carrying Amount of Loans 0 0
Payments received, net, AccretableYield 0 0
Payments received, net, Carrying Amount of Loans (37,768) (83,499)
Balance at end of period, AccretableYield 26,405 30,370
Balance at end of period, Carrying Amount of Loans 236,085 269,888
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion, Carrying Amount of Loans $ 3,965 $ 9,443