CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Securities held-to-maturity, net estimated fair value	$ 1,717	$ 1,715
Securities held-to-maturity, net encumbered	1,099,745	968,466
Loan receivable, allowance for credit losses	$ 59,976	$ 60,735
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred Stock, Liquidation Preference, Value	$ 1	$ 1
Preferred stock, shares authorized (shares)	5,000,000	5,000,000
Preferred stock, shares issued (shares)	57,370	57,370
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	150,000,000	150,000,000
Common stock, shares issued (shares)	61,478,355	61,040,894
Common stock, shares outstanding (shares)	60,329,504	60,392,043
Treasury stock, shares (shares)	648,851	1,148,851