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Deposits - Schedule of Deposits (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Banking and Thrift [Abstract]    
Non-interest bearing transaction $ 709,684 $ 676,067
Interest bearing transaction 1,411,361 1,268,833
Money market deposit accounts 358,818 273,605
Savings, including club deposits 1,490,173 546,449
Certificates of deposit 1,425,217 1,358,474
Total deposits $ 5,395,253 $ 4,123,428