GOODWILL AND OTHER INTANGIBLES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 21, 2018	Jan. 04, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 27,300	$ 27,300
Core deposits
Finite-Lived Intangible Assets [Line Items]
Amortization	406	247
Insurance Services
Finite-Lived Intangible Assets [Line Items]
Goodwill	2,300
Banking and Financial Services
Finite-Lived Intangible Assets [Line Items]
Goodwill		486
Community Bank of Bergen County Merger
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 22,300		$ 22,298
Goodwill acquired	22,300
Community Bank of Bergen County Merger | Core deposits
Finite-Lived Intangible Assets [Line Items]
Intangibles	1,300			$ 1,300
Enterprise Bank N.J.
Finite-Lived Intangible Assets [Line Items]
Goodwill	2,200		$ 2,204
Goodwill acquired	2,200
Enterprise Bank N.J. | Core deposits
Finite-Lived Intangible Assets [Line Items]
Intangibles	$ 1,000		$ 1,000