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Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Loss Contingencies [Line Items]
Unfunded loan related commitments	$ 64,200,000		$ 72,100,000
Unfunded loan related commitments expiration period	3 months		3 months
Liability for credit losses for unfunded commitments	$ 41,000		$ 0
Unfunded commitments expense	41,000	$ 0
Unused Equity Lines of Credit
Loss Contingencies [Line Items]
Unfunded loan related commitments	36,100,000		36,100,000
Originate and Purchase Loans
Loss Contingencies [Line Items]
Unfunded loan related commitments	$ 28,100,000		$ 36,000,000

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