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Covered Assets (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Mar. 31, 2014
Sep. 30, 2013
Covered Assets [Line Items]    
Covered assets $ 252,610 $ 326,927
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Balance at beginning of period 64,615 87,571
Additions 1,896 18,101
Payments made (received) (1,629) (13,421)
Amortization (12,007) (28,722)
Accretion, Carrying Amount of Loans 414 1,086
Balance at end of period 53,289 64,615
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 78,277 50,902
Balance at beginning of period, Carrying Amount of Loans 138,091 74,953
Additions, AccretableYield   43,299
Additions, Carrying Amount of Loans   107,946
Reclassification from nonaccretable balance, net, AccretableYield 5,885 17,850
Reclassification from nonaccretable balance, net, Carrying Amount of Loans (2,069) 0
Accretion, AccretableYield (15,655) (33,774)
Transfers to REO, AccretableYield 0 0
Transfers to REO, Carrying Amount of Loans (678) (11,196)
Payments received, net, AccretableYield 0 0
Payments received, net, Carrying Amount of Loans (50,394) (67,386)
Balance at end of period, AccretableYield 68,507 78,277
Balance at end of period, Carrying Amount of Loans 100,605 138,091
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion, Carrying Amount of Loans 15,655 33,774
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 17,263 23,789
Balance at beginning of period, Carrying Amount of Loans 157,856 213,423
Additions, AccretableYield   0
Additions, Carrying Amount of Loans   0
Reclassification from nonaccretable balance, net, AccretableYield 0 0
Reclassification from nonaccretable balance, net, Carrying Amount of Loans 0 0
Accretion, AccretableYield (3,475) (6,526)
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 (32,331) (62,093)
Balance at end of period, AccretableYield 13,788 17,263
Balance at end of period, Carrying Amount of Loans 129,000 157,856
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion, Carrying Amount of Loans $ 3,475 $ 6,526