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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 998
One to five years, Amortized Cost	15,105
Five to ten years, Amortized Cost	8,113
After ten years, Amortized Cost	10,729
Amortized Cost	34,945
Amortized Cost	231,125	$ 186,589
Within one year, Fair Value	998
One to five years, Fair Value	15,053
Five to ten years, Fair Value	7,764
After ten years, Fair Value	10,073
Fair Value	33,888
Fair Value	218,639	189,891
Mortgage-backed Securities - GSE Residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	196,180	167,711
Fair Value	$ 184,751	$ 170,415

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