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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 0
One to five years, Amortized Cost	5,852
Five to ten years, Amortized Cost	10,850
After ten years, Amortized Cost	11,372
Amortized Cost	28,074
Amortized Cost	228,647	$ 231,672
Within one year, Fair Value	0
One to five years, Fair Value	5,533
Five to ten years, Fair Value	9,659
After ten years, Fair Value	9,342
Fair Value	24,534
Fair Value	191,112	201,299
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	200,573	203,139
Fair Value	$ 166,578	$ 175,726

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