INVESTMENT SECURITIES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investment securities available-for-sale [Abstract]
Amortized cost	$ 297,914		$ 284,947
Unrealized gains	187		311
Unrealized losses	(6,935)		(4,517)
Estimated fair value	291,166		280,741
Proceeds from sales/calls/maturities of available-for-sale securities	11,115	$ 2,737
Gross realized gains from sales/calls of available-for-sale securities	0	0
Gross realized losses from sales/calls of available-for-sale securities	0	$ (16)
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	25,444		18,589
Unrealized gains	0		0
Unrealized losses	(219)		(125)
Estimated fair value	25,225		18,464
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	35,326		21,353
Unrealized gains	0		0
Unrealized losses	(342)		(244)
Estimated fair value	34,984		21,109
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	21,942		23,138
Unrealized gains	137		216
Unrealized losses	(181)		(146)
Estimated fair value	21,898		23,208
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	67,219		67,724
Unrealized gains	0		0
Unrealized losses	(2,338)		(1,641)
Estimated fair value	64,881		66,083
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	147,983		154,143
Unrealized gains	50		95
Unrealized losses	(3,855)		(2,361)
Estimated fair value	$ 144,178		$ 151,877