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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 1,000
One to five years, Amortized Cost	5,957
Five to ten years, Amortized Cost	10,989
After ten years, Amortized Cost	11,873
Amortized Cost	29,819
Amortized Cost	233,947	$ 245,052
Within one year, Fair Value	995
One to five years, Fair Value	5,735
Five to ten years, Fair Value	10,343
After ten years, Fair Value	10,401
Fair Value	27,474
Fair Value	207,693	220,906
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	204,128	210,367
Fair Value	$ 180,219	$ 188,185

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