SECURITIES AVAILABLE FOR SALE - AMORTIZED COST AND FAIR VALUE BY CONTRACTUAL MATURITY (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amortized Cost
Due in one year or less	$ 3,084
Due after one year through five years	30,917
Due after five years through ten years	33,278
Due after ten years	66,910
Securities due at a single maturity date	134,189
Amortized Cost	319,440	$ 275,218
Fair Value
Due in one year or less	3,079
Due after one year through five years	31,186
Due after five years through ten years	33,577
Due after ten years	68,022
Securities due at a single maturity date	135,864
Fair Value	318,177	273,770
Sales of securities
Proceeds from sales of securities, available for sale	27,121	23,888	$ 21,627
Gross gains realized on sales of securities	115	317	425
Gross losses realized on sales of securities	63	30	13
Tax provision related to realized gains	18	98	$ 140
Carrying value of securities pledged	260,400	252,400
Mortgage-backed - residential
Amortized Cost
Amortized Cost	132,664	110,085
Fair Value
Fair Value	130,377	108,075
Mortgage-backed - commercial
Amortized Cost
Amortized Cost	52,267	38,242
Fair Value
Fair Value	51,596	37,695
Equity
Amortized Cost
Amortized Cost	320	320
Fair Value
Fair Value	$ 340	$ 340