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Loans Receivable - Summary of Average Recorded Investment and Interest Income Recognized on Loans Individually Evaluated for Impairment, by Portfolio Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable Impaired [Line Items]    
Impaired loans average recorded investment $ 7,305 $ 4,628
Impaired loans interest income recognized 203 60
Residential Mortgages [Member]    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, average recorded investment 1,936 2,015
Impaired loans with no related allowance recorded, interest income recognized 7 8
Impaired loans with an allowance recorded, average recorded investment 424 434
Impaired loans with an allowance recorded, interest income recognized 3 3
Commercial Mortgages [Member]    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, average recorded investment 3,582  
Commercial Loans [Member]    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, average recorded investment 980 1,809
Impaired loans with no related allowance recorded, interest income recognized 191 49
Impaired loans with an allowance recorded, average recorded investment   15
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, average recorded investment 350 339
Impaired loans with no related allowance recorded, interest income recognized 2  
Impaired loans with an allowance recorded, average recorded investment $ 33 $ 16