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Loans Receivable - Schedule of Loan Modifications (Details) - Term Extension - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 9,851	$ 8,303
% of Total Loan Class Balance	0.05%	0.05%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 9,396	$ 8,303
% of Total Loan Class Balance	0.08%	0.09%
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount		$ 143
% of Total Loan Class Balance		0.00%
Wtd. Avg. Term Extension		20 months
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 9,396	$ 7,814
% of Total Loan Class Balance	0.39%	0.33%
Wtd. Avg. Term Extension	14 months	4 months
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount		$ 346
% of Total Loan Class Balance		0.02%
Wtd. Avg. Term Extension		4 months
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 455
% of Total Loan Class Balance	0.01%
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 455
% of Total Loan Class Balance	0.01%
Wtd. Avg. Term Extension	6 months

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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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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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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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+ 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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