Investment Securities - Fair Value and Carrying Amount of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Investments Debt And Equity Securities [Abstract]
Held to maturity, carrying amount, 1 year or less	$ 5,115
Held to maturity, carrying amount, 1 to 5 years	55,970
Held to maturity, carrying amount, 5 to 10 years	43,463
Held to maturity, carrying amount, over 10 years	81,068
Held to maturity, carrying amount, Mortgage-backed securities and other	225,280
Held to maturity debt securities, Amortized Cost	410,896	$ 337,584
Held to maturity, fair value, 1 year or less	5,157
Held to maturity, fair value, 1 to 5 years	53,720
Held to maturity, fair value, 5 to 10 years	42,030
Held to maturity, fair value, over 10 years	66,179
Held to maturity, fair value, Mortgage-backed securities and other	212,414
Held to maturity, fair value, Total	379,500	342,137
Available for sale, amortized cost, 1 to 5 years	5,000
Available for sale, amortized cost, 5 to 10 years	10,939
Available for sale, amortized cost, over 10 years	7,040
Available for sale, amortized cost, Mortgage-backed securities and other	17,395
Available for sale debt securities, Amortized Cost	40,374	57,213
Available for sale, fair value, 1 to 5 years	4,849
Available for sale, fair value, 5 to 10 years	10,357
Available for sale, fair value, over 10 years	5,534
Available for sale, fair value, Mortgage-backed securities and other	16,445
Available for sale, fair value, Total	$ 37,185	$ 57,387