Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Debt securities, held to maturity, allowance for credit losses	$ 2,529	$ 0
Debt securities, held to maturity, fair value	928,582	777,290
Loan receivable, allowance for credit losses	$ 29,635	$ 16,852
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 1,000	$ 1,000
Preferred stock, shares authorized (shares)	5,000,000	5,000,000
Preferred stock, shares issued (shares)	0	0
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)	60,960,568	60,960,568
Common stock, shares outstanding (shares)	60,311,717	50,405,048
Treasury stock, shares (shares)	648,851	1,586,808