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Loans Receivable - Schedule of Loan Modifications (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 104,492
Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 104,492
% of Total Loan Class Balance	0.49%
Wtd. Avg. Term Extension	13 months
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 103,610
Commercial loans | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 103,610
% of Total Loan Class Balance	0.85%
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 23,449
Commercial loans | Commercial real estate | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 23,449
% of Total Loan Class Balance	0.63%
Wtd. Avg. Term Extension	36 months
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 61,074
Commercial loans | Commercial & industrial | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 61,074
% of Total Loan Class Balance	2.62%
Wtd. Avg. Term Extension	4 months
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 19,087
Commercial loans | Construction | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 19,087
% of Total Loan Class Balance	1.34%
Wtd. Avg. Term Extension	12 months
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 882
Consumer loans | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 882
% of Total Loan Class Balance	0.01%
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 882
Consumer loans | Single-family residential | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term Extension	$ 882
% of Total Loan Class Balance	0.01%
Wtd. Avg. Term Extension	6 months

X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

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