OTHER BORROWINGS - Securities Sold Under Agreements to Repurchase (Details) - Securities sold under repurchase agreements - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Securities sold under agreement to repurchase and Federal funds purchased
Average daily balance during the year	$ 40,717	$ 27,816	$ 26,723
Average interest rate during the year (as a percent)	0.19%	0.14%	0.15%
Maximum month-end balance during the year	$ 47,090	$ 40,778	$ 34,439
Weighted average interest rate at year-end (as a percent)	0.16%	0.18%	0.15%