QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended															12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income																$ 106,240	$ 74,910	$ 58,430
Interest expense																10,129	7,460	7,272
Net interest income																96,111	67,450	51,158
Provision for loan losses																4,000	2,200	2,350
Net interest income after provision for loan losses																92,111	65,250	48,808
Non-interest income																12,668	8,166	8,891
Non-interest expenses																72,890	52,414	37,937
Income before income taxes																31,889	21,002	19,762
Income tax expense																10,778	7,239	6,669
Net Income																$ 21,111	$ 13,763	$ 13,093
Basic earnings per share (in dollars per share)																$ 1.43	$ 1.18	$ 1.36
Diluted earnings per share (in dollars per share)																$ 1.43	$ 1.18	$ 1.36
Parent Company
Interest income	$ 31,609		$ 31,744		$ 22,380		$ 20,507		$ 19,603		$ 19,219	$ 18,730		$ 17,358
Interest expense	3,705		2,659		1,953		1,812		1,866		1,857	1,915		1,822		$ 2,626	$ 1,365	$ 1,365
Net interest income	27,904		29,085		20,427		18,695		17,737		17,362	16,815		15,536
Provision for loan losses	1,000		1,500		700		800		500		500	500		700
Net interest income after provision for loan losses	26,904		27,585		19,727		17,895		17,237		16,862	16,315		14,836
Non-interest income	3,411		3,926		2,527		2,804		2,510		2,562	2,292		802	[1]
Non-interest expenses	18,173	[2]	19,373	[3]	22,034	[4]	13,310	[5]	13,183	[2]	12,094	12,124	[4]	15,013	[5]	73	86	69
Income before income taxes	12,142		12,138		220		7,389		6,564		7,330	6,483		625
Income tax expense	4,147		4,248		(243)		2,626		2,396		2,459	2,165		219		(933)	(463)	(483)
Net Income	$ 7,995		$ 7,890		$ 463		$ 4,763		$ 4,168		$ 4,871	$ 4,318		$ 406		$ 21,111	$ 13,763	$ 13,093
Basic earnings per share (in dollars per share)	$ 0.46		$ 0.45		$ 0.04		$ 0.41		$ 0.36		$ 0.42	$ 0.37		$ 0.04
Diluted earnings per share (in dollars per share)	$ 0.46		$ 0.45		$ 0.04		$ 0.41		$ 0.36		$ 0.42	$ 0.37		$ 0.04

[1] 2014 amount includes net securities losses of $1.1 million.

[2] 2015 amount includes costs associated with the CNB acquisition of $0.5 million. 2014 amount includes costs associated with the CNB acquisition of $0.8 million

[3] 2015 amount includes costs associated with the CNB acquisition of $0.9 million.

[4] 2015 amount includes costs associated with the CNB acquisition of $8.2 million. 2014 amount includes costs associated with the FNBNY acquisition of $0.3 million.

[5] 2015 amount includes costs associated with the CNB acquisition of $0.2 million. 2014 amount includes costs associated with the FNBNY acquisition and branch restructuring of $4.4 million.