PARENT COMPANY FINANCIAL STATEMENTS - INCOME AND COMPREHENSIVE 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
Expenses
Interest expense									$ 5,014	$ 4,426	$ 4,050
Other expenses									33,073	33,785	31,807
Income before income taxes and equity in undistributed income of subsidiary									13,880	9,342	7,362
Applicable income tax benefits									(3,163)	(773)	(530)
Net income	$ 2,578	$ 2,592	$ 2,410	$ 3,137	$ 2,285	$ 2,365	$ 2,082	$ 1,837	10,717	8,569	6,832
Comprehensive income									10,840	7,254	6,400
Parent Company
Income
Dividends from subsidiary									7,135	5,700	4,200
Total income									7,135	5,700	4,200
Expenses
Interest expense									500	482	347
Other expenses									216	209	644
Total expenses									716	691	991
Income before income taxes and equity in undistributed income of subsidiary									6,419	5,009	3,209
Applicable income tax benefits									262	235	269
Income before equity in undistributed income of subsidiary									6,681	5,244	3,478
Equity in undistributed income of subsidiaries									4,036	3,325	3,354
Net income									10,717	8,569	6,832
Comprehensive income									$ 10,840	$ 7,254	$ 6,400