MERGERS AND ACQUISITIONS - PRO FORMA INFORMATION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition, Related Expenses [Abstract]
Merger and conversion costs	$ 7,177	$ 104	$ 24,043	$ 299
Professional services	1,426	1,196	4,081	3,695
Personnel-related expenses	$ 23,102	14,528	64,081	45,121
NewBridge Bancorp
Business Acquisition, Pro Forma Information [Abstract]
Net interest income		63,812	192,846	142,838
Net income		7,323	57,894	19,644
Net income available to common stockholders		$ 7,323	$ 57,894	$ 18,822
Basic income per common share (in dollar per share)		$ 0.14	$ 1.08	$ 0.37
Diluted income per common share (in dollar per share)		$ 0.14	$ 1.08	$ 0.37
Weighted average basic common shares outstanding (in shares)		50,531,046	53,519,018	50,530,424
Weighted average diluted common shares outstanding (in shares)		50,853,071	53,608,776	50,814,787
Business Acquisition, Related Expenses [Abstract]
Merger and conversion costs			$ 17,959	$ 3,532
Professional services			7,934
Personnel-related expenses			8,596
Facility and equipment related expense			4,139
Miscellaneous expenses			$ 821