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Loans Receivable - Schedule of Loans Receivable (including Covered Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 13,312,388	$ 12,853,678
Ratio of type of loan to total loans receivable	100.00%	100.00%
Allowance for probable losses	$ 131,534	$ 129,257	$ 123,073
Loans in process	1,201,341	1,195,506
Net deferred fees, costs and discounts	48,938	51,834
Total loan contra accounts	1,381,813	1,376,597
Net loans	11,930,575	11,477,081
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 5,835,194	$ 5,798,966
Ratio of type of loan to total loans receivable	43.80%	45.10%
Allowance for probable losses	$ 30,988	$ 33,033	36,892
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 2,038,052	$ 1,890,668
Ratio of type of loan to total loans receivable	15.30%	14.70%
Allowance for probable losses	$ 32,304	$ 31,317	24,556
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 540,741	$ 624,479
Ratio of type of loan to total loans receivable	4.10%	4.90%
Allowance for probable losses	$ 1,369	$ 1,842	1,944
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 204,107	$ 155,204
Ratio of type of loan to total loans receivable	1.50%	1.20%
Allowance for probable losses	$ 9,155	$ 7,978	6,829
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 99,694	$ 102,036
Ratio of type of loan to total loans receivable	0.70%	0.80%
Allowance for probable losses	$ 2,143	$ 2,164	2,649
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,422,674	$ 1,385,125
Ratio of type of loan to total loans receivable	10.70%	10.80%
Allowance for probable losses	$ 7,391	$ 8,329	7,862
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,631,170	$ 1,452,168
Ratio of type of loan to total loans receivable	12.30%	11.30%
Allowance for probable losses	$ 13,170	$ 11,852	11,818
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,268,695	$ 1,140,874
Ratio of type of loan to total loans receivable	9.50%	8.90%
Allowance for probable losses	$ 31,450	$ 28,702	28,524
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 142,178	$ 130,852
Ratio of type of loan to total loans receivable	1.10%	1.00%
Allowance for probable losses	$ 1,103	$ 781	855
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 129,883	$ 173,306
Ratio of type of loan to total loans receivable	1.00%	1.30%
Allowance for probable losses	$ 2,461	$ 3,259	$ 1,144

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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