GOODWILL AND OTHER INTANGIBLES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 21, 2018	Jan. 04, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 27,300		$ 27,300
Write-down of goodwill	0
Amortization of Intangible Assets	91	$ 102
Core deposits
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	91	$ 102
Insurance Services
Finite-Lived Intangible Assets [Line Items]
Goodwill	2,300		2,300
Banking and Financial Services
Finite-Lived Intangible Assets [Line Items]
Goodwill	486		486
Community Bank of Bergen County Merger
Finite-Lived Intangible Assets [Line Items]
Goodwill	22,300		22,300
Community Bank of Bergen County Merger | Core deposits
Finite-Lived Intangible Assets [Line Items]
Intangibles					$ 1,300
Enterprise Bank N.J.
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,200		$ 2,200
Enterprise Bank N.J. | Core deposits
Finite-Lived Intangible Assets [Line Items]
Intangibles				$ 1,000