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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 4,000
One to five years, Amortized Cost	4,619
Five to ten years, Amortized Cost	7,661
After ten years, Amortized Cost	10,687
Amortized Cost	26,967
Amortized Cost	219,523	$ 231,672
Within one year, Fair Value	3,938
One to five years, Fair Value	4,240
Five to ten years, Fair Value	7,040
After ten years, Fair Value	9,021
Fair Value	24,239
Fair Value	190,475	201,299
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	192,556	203,139
Fair Value	$ 166,236	$ 175,726

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