Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Interest-bearing deposits in other banks, collateral	$ 0	$ 1,000
Amortized cost of investment securities, available for sale	1,909,483	1,224,227
Investment securities, held-to-maturity-at cost, fair value	136,625	149,431
Allowance for loan and lease losses	$ 47,576	$ 39,539
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	65,000,000
Common stock, issued (in shares)	57,435,658	56,926,978
Treasury stock (in shares)	5,868,772	25,552,887