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Covered Assets (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Covered Assets [Line Items]    
Covered assets $ 387,789 $ 317,925
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Balance at beginning of period 87,571 101,634
Additions 17,373 [1] 3,284 [1]
Payments made (received) (11,668) (3,456)
Amortization (13,451) (15,510)
Accretion, Carrying Amount of Loans 566 1,619
Balance at end of period 80,391 87,571
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 50,902 37,072
Balance at beginning of period, Carrying Amount of Loans 74,953 116,061
Additions, AccretableYield 43,299 [1]  
Additions, Carrying Amount of Loans 107,946 [1]  
Reclassification from nonaccretable balance, net, AccretableYield   34,690
Reclassification from nonaccretable balance, net, Carrying Amount of Loans   0
Accretion, AccretableYield (18,463) (20,860)
Transfers to REO, AccretableYield 0 0
Transfers to REO, Carrying Amount of Loans (7,403) (15,905)
Payments received, net, AccretableYield 0 0
Payments received, net, Carrying Amount of Loans (21,828) (46,063)
Balance at end of period, AccretableYield 75,738 50,902
Balance at end of period, Carrying Amount of Loans 172,131 74,953
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion, Carrying Amount of Loans 18,463 20,860
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 23,789 30,370
Balance at beginning of period, Carrying Amount of Loans 213,423 269,888
Additions, AccretableYield 0 [1]  
Additions, Carrying Amount of Loans 0 [1]  
Reclassification from nonaccretable balance, net, AccretableYield   0
Reclassification from nonaccretable balance, net, Carrying Amount of Loans   0
Accretion, AccretableYield (3,543) (6,581)
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 (33,582) (63,046)
Balance at end of period, AccretableYield 20,246 23,789
Balance at end of period, Carrying Amount of Loans 183,384 213,423
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Accretion, Carrying Amount of Loans $ 3,543 $ 6,581
[1] includes FDIC covered loans which were acquired as part of the South Valley acquisition.