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Loans - Schedule of Outstanding Unpaid Balances and Accrual Status of Loans Acquired with Credit Impairment (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]    
Outstanding balance $ 46,199 $ 38,505
Loans on accrual status 30,804 23,665
Total carrying value $ 30,804 $ 23,665