CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
Balance at Dec. 31, 2018		$ 412,546	$ 15,542	$ 211,345	$ (16,717)	$ (8,789)	$ 613,927
Net income				11,635			11,635
Other comprehensive income, net of tax						3,509	3,509
Cash dividends declared on common stock ($0.090 per share)				(3,422)			(3,422)
Exercise of stock options (21,991 shares)			143				143
Restricted stock grants (42,483 shares)
Restricted stock units (4,904 shares)
Net performance units issued (26,517 shares)			196
Repurchase of treasury stock (13,000 shares)					(250)		(250)
Stock issued (3,032,496 shares) in acquisition of Greater Hudson Bank		56,025					56,025
Stock-based compensation			632				632
Balance at Mar. 31, 2019		468,571	16,513	219,558	(16,967)	(5,280)	682,395
Balance at Dec. 31, 2019		468,571	21,344	271,782	(29,360)	(1,147)	731,190
Net income				6,030			6,030
Other comprehensive income, net of tax						2,611	2,611
Cash dividends declared on common stock ($0.090 per share)				(3,987)			(3,987)
Exercise of stock options (21,991 shares)			163				163
Restricted stock grants (42,483 shares)
Share redemption for tax withholdings on performance units and restricted stock units earned			(297)				(297)
Repurchase of treasury stock (13,000 shares)					(911)		(911)
Stock issued (4,602,450 shares) in acquisition of Bancorp of New Jersey		118,375					118,375
Stock-based compensation			536				536
Balance at Mar. 31, 2020		$ 586,946	$ 21,746	$ 273,825	$ (30,271)	$ 1,464	$ 853,710