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Loans Receivable - Changes in Accretable Yield for Acquired Impaired Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretion $ 236 $ 518
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 72,705 97,125
Carrying amount, balance at beginning of period 111,300 135,826
Accretable yield, reclassifications from nonaccretable balance, net 4,867 6,307
Carrying amount, reclassifications from nonaccretable balance, net 0 0
Accretable yield, accretion (18,730) (30,727)
Accretion 18,730 30,727
Accretable yield, transfers to real estate owned 0 0
Carrying amount, transfers to real estate owned (175) (2,975)
Accretable yield, payments received, net 0 0
Carrying amount, payments received, net (38,094) (52,278)
Accretable yield, balance at end of period 58,842 72,705
Carrying amount, balance at end of period 91,761 111,300
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 7,204 14,513
Carrying amount, balance at beginning of period 187,080 275,862
Accretable yield, reclassifications from nonaccretable balance, net 0 346
Carrying amount, reclassifications from nonaccretable balance, net 0 0
Accretable yield, accretion (2,982) (7,655)
Accretion 2,982 7,655
Accretable yield, transfers to real estate owned 0 0
Carrying amount, transfers to real estate owned 0 (150)
Accretable yield, payments received, net 0 0
Carrying amount, payments received, net (58,930) (96,287)
Accretable yield, balance at end of period 4,222 7,204
Carrying amount, balance at end of period $ 131,132 $ 187,080