Regulatory Matters - Additional Information (Detail) - USD ($)	9 Months Ended
	Mar. 31, 2020	Jun. 30, 2019
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total consolidated assets	$ 3,000,000,000
Capital conservation buffer percentage at beginning period	2.50%	2.50%
Minimum [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer percentage required under regulatory	2.50%