CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Investment securities, held to maturity, fair value	$ 241,429	$ 214,413
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, authorized	3,000,000	3,000,000
Preferred Stock, outstanding	0	0
Preferred Stock, issued	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized	90,000,000	90,000,000
Common Stock, issued	16,771,544	16,747,571
Common Stock, outstanding	16,771,544	16,747,571	16,988,951	16,844,698