Organization and Summary of Significant Accounting Policies - Premises and Equipment and Goodwill (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Mar. 31, 2021	Jun. 30, 2020
Property, Plant and Equipment [Line Items]
Impairment loss on goodwill	$ 0.0	$ 0.0
Software
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	P3Y
Minimum | Premises
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	P7Y
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	P3Y
Maximum | Premises
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	P40Y
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	P7Y