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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019 USD ($) contract	Mar. 31, 2018 USD ($) contract	Mar. 31, 2019 USD ($) contract	Mar. 31, 2018 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	3	12	4	23
Pre-Modification Outstanding Recorded Investment	$ 79	$ 2,183	$ 363	$ 11,451
Post-Modification Outstanding Recorded Investment	$ 79	$ 2,183	$ 363	$ 11,451
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	2	12	3	20
Pre-Modification Outstanding Recorded Investment	$ 39	$ 2,183	$ 323	$ 4,195
Post-Modification Outstanding Recorded Investment	$ 39	$ 2,183	$ 323	$ 4,195
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	1	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 40	$ 0	$ 40	$ 0
Post-Modification Outstanding Recorded Investment	$ 40	$ 0	$ 40	$ 0
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			0	3
Pre-Modification Outstanding Recorded Investment			$ 0	$ 7,256
Post-Modification Outstanding Recorded Investment			$ 0	$ 7,256

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Section 50
-Paragraph 33
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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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