Loans Receivable - Nonaccrual Loans and in Loans Past Due over 90 Days Still on Accrual Status by Portfolio Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 7,435	$ 5,354
Loans Past Due Over 90 Days and Still Accruing	423	411
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	793	1,391
Commercial Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	4,790	3,582
Loans Past Due Over 90 Days and Still Accruing	423	411
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,113
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	400
Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 339	$ 381