Loans and Allowance for Credit Losses - Credit risk profile based on rating and payment activity (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
PCD loans receivable, net of ACL	$ 558,000	$ 560,000
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
PCD loans receivable, net of ACL	41,900,000	40,900,000
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
PCD loans receivable, net of ACL	8,300,000	8,400,000
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
PCD loans receivable, net of ACL	0	0
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
PCD loans receivable, net of ACL	3,200,000	3,100,000
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
PCD loans receivable, net of ACL	$ 0	$ 0