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Loans Receivable - Schedule of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Loans receivable, net	$ 20,916,354	$ 17,476,550
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	7,157
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	51,431
Commercial loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	1,194
Commercial loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	51,431
Commercial loans | Multi-family | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Multi-family | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	18,641
Commercial loans | Commercial real estate | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	32,790
Commercial loans | Commercial & industrial | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Commercial & industrial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Construction | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	1,120
Commercial loans | Construction | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Land - acquisition & development | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	74
Commercial loans | Land - acquisition & development | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	5,963
Consumer loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Construction | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	88
Consumer loans | Construction | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Single-family residential | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	5,678
Consumer loans | Single-family residential | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Land - consumer lot loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Land - consumer lot loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | HELOC | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	197
Consumer loans | HELOC | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Consumer | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Consumer | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	$ 0

X

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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