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Loans Receivable (including Covered Loans) - Changes in Accretable Yield for Acquired Impaired Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretion $ 518 $ 802
Credit-impaired acquired loans    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretable yield, balance at beginning of period 97,125 115,513
Carrying amount, balance at beginning of period 135,826 207,809
Accretable yield, additions 0 0
Carrying Amount, additions 0 0
Accretable yield, reclassifications from nonaccretable balance, net 6,307 17,486
Carrying amount, reclassifications from nonaccretable balance, net 0 (2,069)
Accretable yield, accretion (30,727) (35,874)
Accretion 30,727 35,874
Accretable yield, transfers to real estate owned 0 0
Carrying amount, transfers to real estate owned (2,975) (10,131)
Accretable yield, payments received, net 0 0
Carrying amount, payments received, net (52,278) (95,657)
Accretable yield, balance at end of period 72,705 97,125
Carrying amount, balance at end of period 111,300 135,826
Acquired non-impaired loans    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretable yield, balance at beginning of period 14,513 22,240
Carrying amount, balance at beginning of period 275,862 403,229
Accretable yield, additions 0 0
Carrying Amount, additions 0 0
Accretable yield, reclassifications from nonaccretable balance, net 346 0
Carrying amount, reclassifications from nonaccretable balance, net 0 0
Accretable yield, accretion (7,655) (7,727)
Accretion 7,655 7,727
Accretable yield, transfers to real estate owned 0 0
Carrying amount, transfers to real estate owned (150) (4,710)
Accretable yield, payments received, net 0 0
Carrying amount, payments received, net (96,287) (130,384)
Accretable yield, balance at end of period 7,204 14,513
Carrying amount, balance at end of period $ 187,080 $ 275,862