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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 16,406
One to five years, Amortized Cost	4,601
Five to ten years, Amortized Cost	1,134
After ten years, Amortized Cost	7,682
Amortized Cost	29,823
Amortized Cost	227,972	$ 231,672
Within one year, Fair Value	15,331
One to five years, Fair Value	4,406
Five to ten years, Fair Value	1,082
After ten years, Fair Value	6,218
Fair Value	27,037
Fair Value	199,930	201,299
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	198,149	203,139
Fair Value	$ 172,893	$ 175,726

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