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Securities - Additional Information (Detail) - USD ($)	6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities with a book value	$ 211,193,000		$ 219,523,000
Fair Value	$ 182,890,000		190,475,000
Percentage of equity securities	10.00%
Repurchase agreements	$ 18,439,000		17,772,000
Gross gains from sales of available for sale securities	30,000	$ 0
Gross losses from sales of available for sale securities	101,000	0
Tax benefit to net realized gains (losses)	20	0
Investments in debt and marketable equity securities	$ 181,142,000		$ 185,652,000
Temporarily impaired debt securities percentage of investment securities portfolio	99.00%		97.00%
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable		Interest Receivable
Asset Pledged as Collateral with Right [Member]
Debt Securities, Available-for-sale [Line Items]
Carrying value of securities pledged as collateral	$ 71,977,000		$ 118,577,000
Tax benefit to net realized gains (losses)	20,000	$ 0
Maturity Overnight [Member]
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	18,400,000
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities with a book value	188,708,000		192,556,000
Fair Value	162,835,000		166,236,000
Investments in debt and marketable equity securities	162,835,000		163,470,000
Small Business Administration [Member]
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities with a book value	15,720,000		16,387,000
Fair Value	13,537,000		14,086,000
Investments in debt and marketable equity securities	13,537,000		14,086,000
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investments in debt and marketable equity securities	$ 181,142,000		$ 185,652,000

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