Loans Receivable - Schedule of Carrying Amount of Purchased Credit Impaired Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019
Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans, allowance	$ 0	$ 83

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant