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Loans Receivable - Loan Modifications (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018 USD ($) contract	Mar. 31, 2017 USD ($) contract	Mar. 31, 2018 USD ($) contract	Mar. 31, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of contracts \| contract	1	7	2	15
Recorded investment \| $	$ 162	$ 1,192	$ 206	$ 3,452
Single-family residential
Financing Receivable, Modifications [Line Items]
Number of contracts \| contract	1	7	2	13
Recorded investment \| $	$ 162	$ 1,192	$ 206	$ 3,185
Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of contracts \| contract			0	2
Recorded investment \| $			$ 0	$ 267