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Covered Assets (Details) (USD $)
 9 Months Ended 12 Months Ended
Jun. 30, 2012
Sep. 30, 2011
Covered assets $ 335,823,000 $ 438,566,000
Loans and Leases Receivable, Covered Loans, Gross 399,768,000 495,358,000
Discount balance related to acquired loans (93,321,000) (109,409,000)
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Balance at beginning of period 101,634,000 131,128,000
Additions 5,742,000 10,470,000
Payments made (received) (276,000) (32,828,000)
Amortization (11,023,000) (10,239,000)
Accretion, Carrying Amount of Loans 1,303,000 3,103,000
Balance at end of period 97,380,000 101,634,000
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 37,072,000 27,019,000
Balance at beginning of period, Carrying Amount of Loans 116,061,000 190,530,000
Reclassification from nonaccretable balance, net, AccretableYield   24,025,000
Reclassification from nonaccretable balance, net, Carrying Amount of Loans   0
Accretion, AccretableYield (15,142,000) (13,972,000)
Transfers to REO, AccretableYield 0 0
Transfers to REO, Carrying Amount of Loans (13,094,000) (54,638,000)
Payments received, net, AccretableYield 0 0
Payments received, net, Carrying Amount of Loans (43,361,000) (33,803,000)
Balance at end of period, AccretableYield 21,930,000 37,072,000
Balance at end of period, Carrying Amount of Loans 74,748,000 116,061,000
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion, Carrying Amount of Loans 15,142,000 13,972,000
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 30,370,000 39,813,000
Balance at beginning of period, Carrying Amount of Loans 269,888,000 343,944,000
Reclassification from nonaccretable balance, net, AccretableYield   0
Reclassification from nonaccretable balance, net, Carrying Amount of Loans   0
Accretion, AccretableYield (4,939,000) (9,443,000)
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 (46,894,000) (83,499,000)
Balance at end of period, AccretableYield 25,431,000 30,370,000
Balance at end of period, Carrying Amount of Loans 227,933,000 269,888,000
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion, Carrying Amount of Loans $ 4,939,000 $ 9,443,000