LOANS (Detail Textuals 1) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 19, 2015 USD ($)	Feb. 14, 2014 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Financing Receivables
Total loans			$ 2,596,205	$ 2,407,522
Impaired loans			3,400	2,600
Other real estate owned				250
Charge offs relating to TDRs			$ 100	700	$ 500
Number of loans modified as TDRs for which there was a payment default within twelve months following the modification | segment			1
Period of modified contractually past due loans to be considered as payment default			30 days
Nonaccrual troubled debt restructured loans			$ 300	100
Amount of current and performing TDR loans			2,400	1,700
Appraised value of collateral for nonaccrual TDR loans			1,300	300
Post-Modification of other than troubled debt restructuring, recorded investment			38,900
Special Mention
Financing Receivables
Total loans			73,225	7,733
Substandard
Financing Receivables
Total loans			11,076	19,193
FNBNY
Acquired Loans
Contractually required principal and interest payments receivable		$ 40,300
Expected cash flows		28,400
Fair value (initial carrying amount) of purchased credit impaired loans		21,800
Non-accretable difference		11,900
Initial accretable yield		$ 6,600
Outstanding balance of purchased credit impaired loans			12,200	16,700
Carrying amount of purchased credit impaired loans			7,000	8,300
Remaining non-accretable difference			1,300	1,500
FNBNY | Special Mention
Financing Receivables
Total loans			200	100
FNBNY | Substandard
Financing Receivables
Total loans			200	200
CNB
Acquired Loans
Contractually required principal and interest payments receivable	$ 23,400
Expected cash flows	10,100
Fair value (initial carrying amount) of purchased credit impaired loans	8,700
Non-accretable difference	13,300
Initial accretable yield	$ 1,400
Outstanding balance of purchased credit impaired loans			12,200	22,500
Carrying amount of purchased credit impaired loans			2,300	8,200
Remaining non-accretable difference			6,900	13,300
CNB | 30-59 Days Past Due
Financing Receivables
Acquired loans			1,000	1,200
CNB | Special Mention
Financing Receivables
Total loans			10	20
CNB | Substandard
Financing Receivables
Total loans			$ 1,500	$ 9,600