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Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual interest income recognized			$ 1,571
Impaired, interest lost on nonaccrual loans			$ 1,151
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.40%		0.40%		0.42%
Percent of TDRs classified as performing			96.90%
Troubled debt restructuring, amount	$ 79	$ 2,183	$ 363	$ 11,451
Basis point reduction, minimum			1.00%
Basis point reduction, maximum			2.00%
Single family residential loans as percentage of restructured loans	89.80%		89.80%
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term for payment and rate reduction			6 months
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term for payment and rate reduction			24 months
Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring, amount			$ 140,599

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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Financing Receivables, Percent of Troubled Debt Restructuring Classified as Performing

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