Loans Receivable - Schedule of Carrying Amount of Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	$ 1,220,682	$ 1,093,121
Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	1,768	2,232
Acquired with Deteriorated Credit Quality [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	748	1,186
Acquired with Deteriorated Credit Quality [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	877	890
Acquired with Deteriorated Credit Quality [Member] | Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	$ 143	$ 156