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Covered Assets - Acquired Impaired and Non-impaired Covered Loans (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretion, carrying amount of loans $ 422 $ 802
Acquired Impaired Loans [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period, accretable yield 64,534 78,277
Balance at beginning of period, carrying amount of loans 78,055 138,091
Transferred to non-covered, accretable yield (23,167)  
Transferred to non-covered, carrying amount (15,866)  
Reclassification from nonaccretable balance, net, accretable yield 6,307 10,186
Reclassification from nonaccretable balance, net, Carrying Amount of Loans 0 2,069
Accretion, accretable yield (11,577) (23,929)
Accretion, carrying amount of loans 11,577 23,929
Transfers to REO, accretable yield 0 0
Transfers to REO, carrying amount of loans (1,893) (8,943)
Payments received, net, accretable yield 0 0
Payments received, net, carrying amount of loans (19,845) (72,953)
Balance at end of period, accretable yield 36,097 64,534
Balance at end of period, carrying amount of loans 52,028 78,055
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, accretable yield 10,259 17,263
Balance at beginning of period, carrying amount of loans 98,422 157,856
Transferred to non-covered, accretable yield (1,482)  
Transferred to non-covered, carrying amount (33,649)  
Reclassification from nonaccretable balance, net, accretable yield 0 0
Reclassification from nonaccretable balance, net, Carrying Amount of Loans 0 0
Accretion, accretable yield (4,358) (7,004)
Accretion, carrying amount of loans 4,358 7,004
Transfers to REO, accretable yield 0 0
Transfers to REO, carrying amount of loans 0 0
Payments received, net, accretable yield 0 0
Payments received, net, carrying amount of loans (43,848) (66,438)
Balance at end of period, accretable yield 4,419 10,259
Balance at end of period, carrying amount of loans $ 25,283 $ 98,422