Merger Agreement (Details) - Forecast - Kearny Financial Corp $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Business Acquisition [Line Items]
Entity shares issued per acquiree share (in shares) | shares	1.3
Cash paid per acquiree share (in dollars per share) | $ / shares	$ 18
Stock consideration, percentage	90.00%
Cash consideration, percentage	10.00%
Merger agreement termination fee | $	$ 3,540