INCOME TAX - Income tax expense - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income tax expense
Currently payable	$ 8,455	$ 4,726	$ 4,578
Deferred	4,135	5,697	5,950
Change in valuation allowance	(453)	(190)	(2,749)
Total income tax expense	12,137	10,233	7,779
Parent Company
Income tax expense
Total income tax expense	$ (4,415)	$ (2,989)	$ (3,118)