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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 0
One to five years, Amortized Cost	5,956
Five to ten years, Amortized Cost	10,996
After ten years, Amortized Cost	11,581
Amortized Cost	28,533
Amortized Cost	231,672	$ 245,052
Within one year, Fair Value	0
One to five years, Fair Value	5,653
Five to ten years, Fair Value	10,042
After ten years, Fair Value	9,878
Fair Value	25,573
Fair Value	201,299	220,906
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	203,139	210,367
Fair Value	$ 175,726	$ 188,185

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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