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Loans Receivable - Schedule of Loan Modifications (Details) - Term Extension - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 55,821	$ 63,961
% of Total Loan Class Balance	0.27%	0.30%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 55,821	$ 63,961
% of Total Loan Class Balance	0.48%	0.55%
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount		$ 93
% 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	$ 42,683	$ 50,730
% of Total Loan Class Balance	1.87%	2.22%
Wtd. Avg. Term Extension	3 months	3 months
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 13,138	$ 13,138
% of Total Loan Class Balance	0.81%	0.81%
Wtd. Avg. Term Extension	15 months	15 months

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+ References

No definition available.

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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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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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