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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]    
Within one year, Amortized Cost $ 1,999  
One to five years, Amortized Cost 9,274  
Five to ten years, Amortized Cost 10,598  
After ten years, Amortized Cost 12,814  
Amortized Cost 34,685  
Amortized Cost 245,052 $ 186,589
Within one year, Fair Value 1,977  
One to five years, Fair Value 9,069  
Five to ten years, Fair Value 10,044  
After ten years, Fair Value 11,631  
Fair Value 32,721  
Fair Value 220,906 189,891
Mortgage-backed Securities - GSE Residential [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 210,367 167,711
Fair Value $ 188,185 $ 170,415