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Loans Receivable - FDIC Indemnification Asset (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
FDIC Indemnification Asset [Roll Forward]    
Balance at beginning of period $ 16,275 $ 36,860
Additions 0 (1,795)
Payments received (1,974) (720)
Amortization (287) (18,588)
Accretion 62 518
Balance at end of period $ 14,076 $ 16,275