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, 2020	Jun. 30, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 1,802	$ 2,726
Loans Past Due Over 90 Days and Still Accruing		1
Originated [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,242	536
Originated [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual		150
Originated [Member] | Consumer and Overdrafts [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due Over 90 Days and Still Accruing		1
Originated [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	42	383
Acquired [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	222	795
Acquired [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 296	294
Acquired [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual		$ 568