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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]    
Within one year, Amortized Cost  
One to five years, Amortized Cost 6,030  
Five to ten years, Amortized Cost 4,963  
After ten years, Amortized Cost 7,885  
Amortized Cost 18,878  
Amortized Cost 186,589 $ 155,588
Within one year, Fair Value  
One to five years, Fair Value 6,447  
Five to ten years, Fair Value 5,103  
After ten years, Fair Value 7,926  
Fair Value 19,476  
Fair Value 189,891 162,394
Mortgage-backed Securities - GSE Residential [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 167,711 143,033
Fair Value $ 170,415 $ 148,855