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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Jun. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 4,001
One to five years, Amortized Cost	3,691
Five to ten years, Amortized Cost	9,633
After ten years, Amortized Cost	9,821
Amortized Cost	27,146
Amortized Cost	225,425	$ 231,672
Within one year, Fair Value	3,921
One to five years, Fair Value	3,558
Five to ten years, Fair Value	8,713
After ten years, Fair Value	8,127
Fair Value	24,319
Fair Value	195,257	201,299
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	198,279	203,139
Fair Value	$ 170,938	$ 175,726

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