PARENT COMPANY FINANCIAL INFORMATION - CONDENSED STATEMENTS OF INCOME (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income:
Interest and dividends	$ 11,610	$ 11,055	$ 10,934	$ 10,864	$ 11,226	$ 10,895	$ 11,008	$ 10,621	$ 44,463	$ 43,750	$ 42,659
INCOME BEFORE INCOME TAXES	4,634	4,146	4,030	4,434	4,991	3,891	4,011	4,032	17,244	16,925	15,696
Income tax benefit	(1,017)	(1,040)	(1,027)	(1,188)	(1,337)	(995)	(1,043)	(1,068)	(4,272)	(4,443)	(4,222)
NET INCOME	$ 3,617	$ 3,106	$ 3,003	$ 3,246	$ 3,654	$ 2,896	$ 2,968	$ 2,964	12,972	12,482	11,474
Parent Company
Income:
Dividends from subsidiaries									6,800	7,300	5,400
Interest and dividends									36	38	58
Net gain on sales of securities									14	8	254
Total income									6,850	7,346	5,712
Total expenses									1,290	1,014	1,016
INCOME BEFORE INCOME TAXES									5,560	6,332	4,696
Income tax benefit									380	336	250
Equity in undistributed income of subsidiaries									7,032	5,814	6,528
NET INCOME									$ 12,972	$ 12,482	$ 11,474