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Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual percent of total loans	0.25%	0.28%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 30,089	$ 33,731
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	100.00%	100.00%
Non-accrual loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 23,014	$ 25,271
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	76.50%	74.90%
Non-accrual loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 86	$ 169
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	0.30%	0.50%
Non-accrual loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 334	$ 246
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	1.10%	0.70%
Non-accrual loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 5,557	$ 5,835
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	18.50%	17.30%
Non-accrual loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 467	$ 1,292
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	1.50%	3.80%
Non-accrual loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 630	$ 907
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	2.10%	2.70%
Non-accrual loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 1	$ 11
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	0.00%	0.00%

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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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 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524

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