CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Interest-bearing deposits in banks and other financial institutions, collateral	$ 0	$ 0
Available-for-sale securities, amortized cost basis	1,953,089	1,909,483
Allowance for credit loss	8	136,625
Held-to-maturity securities, fair value	137,374	136,625
Allowance for credit losses	$ 139,073	$ 47,576
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, issued (in shares)	57,506,298	57,435,658
Treasury stock, shares (in shares)	6,873,120	5,868,772