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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 3,034
One to five years, Amortized Cost	3,910
Five to ten years, Amortized Cost	6,259
After ten years, Amortized Cost	9,282
Amortized Cost	22,485
Amortized Cost	211,193	$ 219,523
Within one year, Fair Value	3,025
One to five years, Fair Value	3,613
Five to ten years, Fair Value	5,766
After ten years, Fair Value	7,651
Fair Value	20,055
Fair Value	182,890	190,475
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	188,708	192,556
Fair Value	$ 162,835	$ 166,236

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