Consolidated Statements of Financial Condition (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	115,672,000	112,351,000
Common stock, shares outstanding	106,375,000	102,717,000
Treasury stock, shares	9,297,000	9,634,000
Securities held-to-maturity, at fair value	$ 9,871	$ 12,013