Securities - Stratification by Contractual Maturity of Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale, Maturity, Maturity Date, Amortized Cost [Abstract]
Due in one year or less, Amortized Cost	$ 2,621
Due after one year through five years, Amortized Cost	18,736
Due after five years through ten years, Amortized Cost	336,005
Due after ten years, Amortized Cost	316,193
Securities available for sale, Amortized Cost	673,555
Debt Securities, Available-for-sale, Maturity, Maturity Date, Fair Value [Abstract]
Due in one year or less, Fair Value	2,625
Due after one year through five years, Fair Value	18,725
Due after five years through ten years, Fair Value	327,737
Due after ten years, Fair Value	307,115
Securities available for sale, Fair Value Total	656,202
Debt Securities, Held-to-maturity, Maturity Date, Amortized Cost [Abstract]
Due in one year or less, Amortized Cost	5,048
Due after one year through five years, Amortized Cost	14,409
Due after five years through ten years, Amortized Cost	1,702
Debt Securities, Held-to-maturity, Maturity Date, Fair Value [Abstract]
Due in one year or less, Fair Value	5,056
Due after one year through five years, Fair Value	14,377
Due after five years through ten years, Fair Value	1,692
Debt Securities [Member]
Debt Securities, Available-for-sale, Maturity, Maturity Date, Amortized Cost [Abstract]
Securities available for sale, Amortized Cost	673,555	$ 619,512
Debt Securities, Available-for-sale, Maturity, Maturity Date, Fair Value [Abstract]
Securities available for sale, Fair Value Total	656,202	625,823
Debt Securities, Held-to-maturity, Maturity Date, Amortized Cost [Abstract]
Amortized Cost	21,159	25,824
Debt Securities, Held-to-maturity, Maturity Date, Fair Value [Abstract]
Securities available for sale, Fair Value Total	$ 21,125	$ 27,028