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Securities - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities with a book value	$ 237,410,000		$ 237,410,000		$ 245,052,000
Fair Value	$ 208,098,000		$ 208,098,000		220,906,000
Percentage of equity securities	10.00%		10.00%
Repurchase agreements	$ 9,938,000		$ 9,938,000		9,244,000
Gross gains from sales of available for sale securities			0	$ 0
Gross losses from sales of available for sale securities			183,000	0
Tax benefit to net realized gains (losses)	52,000	$ 0	52,000	$ 0
Investments in debt and marketable equity securities	$ 197,809,000		$ 197,809,000		$ 209,133,000
Temporarily impaired debt securities percentage of investment securities portfolio	95.00%		95.00%		95.00%
Asset Pledged as Collateral with Right [Member]
Debt Securities, Available-for-sale [Line Items]
Carrying value of securities pledged as collateral	$ 110,870,000		$ 110,870,000		$ 125,209,000
Maturity Overnight [Member]
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	9,900,000		9,900,000
Mortgage-backed Securities - GSE Residential [Member]
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities with a book value	206,631,000		206,631,000		210,367,000
Fair Value	180,078,000		180,078,000		188,185,000
Investments in debt and marketable equity securities	173,232,000		173,232,000		181,629,000
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investments in debt and marketable equity securities	197,809,000		197,809,000		209,133,000
Small Business Administration [Member]
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities with a book value	18,366,000		18,366,000		17,960,000
Fair Value	16,176,000		16,176,000		16,442,000
Investments in debt and marketable equity securities	$ 16,176,000		$ 16,176,000		$ 14,983,000

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