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Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual percent of total loans	0.44%	0.49%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 51,450	$ 55,686
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	$ 24,748	$ 27,643
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	48.10%	49.60%
Non-accrual loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 1,380	$ 2,427
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	2.70%	4.40%
Non-accrual loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 438	$ 920
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	0.90%	1.70%
Non-accrual loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 785	$ 787
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	1.50%	1.40%
Non-accrual loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 9,478	$ 8,971
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	18.40%	16.10%
Non-accrual loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 13,995	$ 14,394
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	27.20%	25.80%
Non-accrual loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 599	$ 523
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	1.20%	0.90%
Non-accrual loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 27	$ 21
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	0.10%	0.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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