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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 5,040
One to five years, Amortized Cost	4,062
Five to ten years, Amortized Cost	6,409
After ten years, Amortized Cost	9,468
Amortized Cost	24,979
Amortized Cost	215,050	$ 219,523
Within one year, Fair Value	5,015
One to five years, Fair Value	3,818
Five to ten years, Fair Value	6,053
After ten years, Fair Value	8,127
Fair Value	23,013
Fair Value	192,651	190,475
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	190,071	192,556
Fair Value	$ 169,638	$ 166,236

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