Consolidated Statements of Financial Condition (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Securities held-to-maturity, at fair value	$ 12,013	$ 18,212
Preferred stock, shares authorized	1,000,000	1,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	150,000,000
Common stock, shares issued	112,351,000	91,284,000
Common stock, shares outstanding	102,717,000	81,325,000
Treasury stock, shares	9,634,000	9,959,000