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Covered Assets (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Loans and Leases Receivable, Covered Loans, Gross $ 454,391,000 $ 495,358,000
Covered assets 396,003,000 438,566,000
Discount balance related to acquired loans (103,156,000) (109,409,000)
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Balance at beginning of period 101,634,000 131,128,000
Additions 1,356,000 10,470,000
Payments received (6,761,000) (32,828,000)
Amortization (4,723,000) (10,239,000)
Accretion 597,000 3,103,000
Balance at end of period 92,103,000 101,634,000
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 (5,351,000) (13,972,000)
Transfers to REO, AccretableYield    0
Transfers to REO, Carrying Amount of Loans (5,472,000) (54,638,000)
Payments received, net, AccretableYield    0
Payments received, net, Carrying Amount of Loans (15,845,000) (33,803,000)
Balance at end of period, AccretableYield 31,721,000 37,072,000
Balance at end of period, Carrying Amount of Loans 100,095,000 116,061,000
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion 5,351,000 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 (2,684,000) (9,443,000)
Transfers to REO, AccretableYield 0 0
Transfers to REO, Carrying Amount of Loans    0
Payments received, net, AccretableYield 0 0
Payments received, net, Carrying Amount of Loans (25,198,000) (83,499,000)
Balance at end of period, AccretableYield 27,686,000 30,370,000
Balance at end of period, Carrying Amount of Loans 247,374,000 269,888,000
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion $ 2,684,000 $ 9,443,000