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Loans Receivable - Schedule of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Financing Receivable, Past Due [Line Items]
Net loans	$ 20,920,001	$ 20,916,354
Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	2,020
Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	39,838
Commercial loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	39,838
Commercial loans | Multi-family | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Multi-family | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	10,477
Commercial loans | Commercial real estate | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	29,361
Commercial loans | Commercial & industrial | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Commercial & industrial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Construction | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Construction | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Land - acquisition & development | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Land - acquisition & development | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	2,020
Consumer loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Construction | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	88
Consumer loans | Construction | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Single-family residential | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	1,720
Consumer loans | Single-family residential | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Land - consumer lot loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Land - consumer lot loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | HELOC | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	212
Consumer loans | HELOC | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Consumer | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Consumer | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	$ 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
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

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