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Borrowings - Maturity Dates of Outstanding FHLB Advances (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
FHLB advances
Within 1 year	$ 2,099,353	$ 2,900,000
1 to 3 years	93,354	0
3 to 5 years	167	0
FHLB advances	$ 2,192,874	$ 2,900,000

X

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478878/942-470-45-1

+ Details

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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of advance from Federal Home Loan Bank (FHLBank) maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478878/942-470-45-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 470
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-1

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- Definition

Federal Home Loan Bank, Advances, Maturities Summary, Due from One Year to Three Years of Balance Sheet Date

+ References

No definition available.

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- Definition

Federal Home Loan Bank, Advances, Maturities Summary, Due from Three Years to Five Years of Balance Sheet Date

+ References

No definition available.

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