INVESTMENT SECURITIES, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2018 USD ($) Security	Dec. 31, 2017 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 119,623	$ 117,729
Less than 12 months, unrealized losses	(1,919)	(1,312)
12 months or more, fair value	156,988	141,518
12 Months or more, unrealized losses	(5,016)	(3,205)
Total fair value	276,611	259,247
Total unrealized losses	$ (6,935)	(4,517)
Investment securities in unrealized loss position less than 12 months | Security	97
Investment securities in unrealized loss position more than 12 months | Security	139
Investment securities pledged as collateral	$ 32,957	32,399
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	16,811	10,004
Less than 12 months, unrealized losses	(59)	(2)
12 months or more, fair value	8,414	8,460
12 Months or more, unrealized losses	(160)	(123)
Total fair value	25,225	18,464
Total unrealized losses	(219)	(125)
Securities of U.S. Government Agencies and Corporations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	19,960	6,049
Less than 12 months, unrealized losses	(119)	(50)
12 months or more, fair value	15,024	15,060
12 Months or more, unrealized losses	(223)	(194)
Total fair value	34,984	21,109
Total unrealized losses	(342)	(244)
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	5,610	7,677
Less than 12 months, unrealized losses	(50)	(34)
12 months or more, fair value	7,273	7,116
12 Months or more, unrealized losses	(131)	(112)
Total fair value	12,883	14,793
Total unrealized losses	(181)	(146)
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	28,440	31,679
Less than 12 months, unrealized losses	(776)	(576)
12 months or more, fair value	36,441	34,404
12 Months or more, unrealized losses	(1,562)	(1,065)
Total fair value	64,881	66,083
Total unrealized losses	(2,338)	(1,641)
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	48,802	62,320
Less than 12 months, unrealized losses	(915)	(650)
12 months or more, fair value	89,836	76,478
12 Months or more, unrealized losses	(2,940)	(1,711)
Total fair value	138,638	138,798
Total unrealized losses	$ (3,855)	$ (2,361)