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Disclosures about Fair Value of Assets and Liabilities - (Losses)/Recoveries Recognized on Assets Measured on Non-Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (collateral-dependent)		$ 33
Foreclosed and repossessed assets held for sale	$ 0		$ (160)	$ 0	$ (160)
Non-recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (collateral-dependent)	$ 0			$ 13