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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]    
Within one year, Amortized Cost $ 2,001  
One to five years, Amortized Cost 9,077  
Five to ten years, Amortized Cost 10,547  
After ten years, Amortized Cost 12,475  
Amortized Cost 34,100  
Amortized Cost 238,721 $ 245,052
Within one year, Fair Value 1,975  
One to five years, Fair Value 8,683  
Five to ten years, Fair Value 9,639  
After ten years, Fair Value 10,895  
Fair Value 31,192  
Fair Value 206,619 220,906
Mortgage-backed Securities - GSE Residential [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 204,621 210,367
Fair Value $ 175,427 $ 188,185