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Securities - Stratification by Contractual Maturity of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Jun. 30, 2021
Debt Securities, Available-for-sale, Maturity, Marurity Date, Amortized Cost [Abstract]    
Due in one year or less, Amortized Cost $ 1,970  
Due after one year through five years, Amortized Cost 18,939  
Due after five years through ten years, Amortized Cost 353,679  
Due after ten years, Amortized Cost 355,955  
Securities available for sale, Amortized Cost 730,543  
Debt Securities, Available-for-sale, Maturity, Maturity Date, Fair Value [Abstract]    
Due in one year or less, Fair Value 1,971  
Due after one year through five years, Fair Value 19,008  
Due after five years through ten years, Fair Value 351,676  
Due after ten years, Fair Value 353,122  
Securities available for sale, Fair Value Total 725,777  
Debt Securities, Held-to-maturity, Maturity Date, Amortized Cost [Abstract]    
Due in one year or less, Amortized Cost 6,817  
Due after one year through five years, Amortized Cost 15,026  
Due after five years through ten years, Amortized Cost 1,703  
Amortized Cost 23,546  
Debt Securities, Held-to-maturity, Maturity Date, Fair Value [Abstract]    
Due in one year or less, Fair Value 6,832  
Due after one year through five years, Fair Value 15,084  
Due after five years through ten years, Fair Value 1,728  
Securities available for sale, Fair Value Total 23,644  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Maturity, Marurity Date, Amortized Cost [Abstract]    
Securities available for sale, Amortized Cost 730,543 $ 619,512
Debt Securities, Available-for-sale, Maturity, Maturity Date, Fair Value [Abstract]    
Securities available for sale, Fair Value Total 725,777 625,823
Debt Securities, Held-to-maturity, Maturity Date, Amortized Cost [Abstract]    
Amortized Cost 23,546 25,824
Debt Securities, Held-to-maturity, Maturity Date, Fair Value [Abstract]    
Securities available for sale, Fair Value Total $ 23,644 $ 27,028