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Basis of Presentation (Details) $ in Thousands	Jun. 25, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) office	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Assets of acquiree		$ 33,765,539		$ 31,863,088
Loans of acquiree		26,405,306		24,883,610
Deposits of acquiree		$ 25,546,122		$ 24,452,974
Oritani
Business Acquisition [Line Items]
Share ratio of common stock issued to Oritani shareholders			1.60
Transaction value	$ 740,000
Oritani
Business Acquisition [Line Items]
Assets of acquiree			$ 4,000,000
Loans of acquiree			3,400,000
Deposits of acquiree			$ 2,900,000
Number of offices \| office			26