INVESTMENT SECURITIES, Amortized Cost, Estimated Values and Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2016	Dec. 31, 2015
INVESTMENT SECURITIES [Abstract]
Investment securities transferred from available for sale to held to maturity, fair value	$ 48,000
Investment securities transferred from available for sale to held to maturity, unrealized gain (loss)	$ (3,200)
Available for sale [Abstract]
Total securities available for sale		$ 190,093	$ 244,706
Gross Unrealized Gains		4,640	4,510
Gross Unrealized Losses		(460)	(2,117)
Fair value		194,273	247,099
Held to maturity [Abstract]
Amortized Cost		18,896	61,309
Gross Unrealized Gains		737	1,993
Gross Unrealized Losses		0	(30)
Fair Value		19,633	63,272
Total investment securities [Abstract]
Total Amortized Cost		208,989	306,015
Total Gross Unrealized Gains		5,377	6,503
Total Gross Unrealized Losses		(460)	(2,147)
Total Fair Value		213,906	310,371
Investment securities pledged		180,000	261,000
U.S. Government Agency Securities [Member]
Available for sale [Abstract]
Total securities available for sale		0	28,977
Gross Unrealized Gains		0	2
Gross Unrealized Losses		0	(463)
Fair value		0	28,516
Obligations of States and Political Subdivisions [Member]
Available for sale [Abstract]
Total securities available for sale		69,239	100,215
Gross Unrealized Gains		2,719	4,467
Gross Unrealized Losses		0	0
Fair value		71,958	104,682
Collateralized Mortgage Obligations [Member]
Available for sale [Abstract]
Total securities available for sale		18,412	15,795
Gross Unrealized Gains		57	2
Gross Unrealized Losses		(73)	(248)
Fair value		18,396	15,549
Mortgage-Backed Securities [Member]
Available for sale [Abstract]
Total securities available for sale		93,442	93,719
Gross Unrealized Gains		1,864	39
Gross Unrealized Losses		(12)	(1,316)
Fair value		95,294	92,442
Corporate Bonds [Member]
Available for sale [Abstract]
Total securities available for sale		9,000	6,000
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(375)	(90)
Fair value		8,625	5,910
U.S. Government Agency Securities [Member]
Held to maturity [Abstract]
Amortized Cost		2,375	43,570
Gross Unrealized Gains		125	1,450
Gross Unrealized Losses		0	0
Fair Value		2,500	45,020
Obligations of States and Political Subdivisions [Member]
Held to maturity [Abstract]
Amortized Cost		10,521	11,739
Gross Unrealized Gains		449	536
Gross Unrealized Losses		0	0
Fair Value		10,970	12,275
Corporate Bonds [Member]
Held to maturity [Abstract]
Amortized Cost		6,000	6,000
Gross Unrealized Gains		163	7
Gross Unrealized Losses		0	(30)
Fair Value		$ 6,163	$ 5,977