CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - USD ($)	Dec. 31, 2020	Jun. 30, 2020
Securities available for sale, estimated fair value	$ 1,671,935,000	$ 1,363,221,000
Net of allowance for credit losses	0
Securities held to maturity, estimated fair value	$ 31,063,000	$ 34,069,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	84,938,272	83,663,192
Common stock, shares outstanding	84,938,272	83,663,192
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares	2,859,940	2,960,289
Available-for-sale Securities [Member]
Securities available for sale, estimated fair value	$ 1,671,935,000
Net of allowance for credit losses	0
Held-to-maturity Securities [Member]
Net of allowance for credit losses	0
Securities held to maturity, estimated fair value	$ 31,063,000	$ 34,069,000