GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Amortization Expense of Other Intangible Assets (Details) - Core Deposit Intangible - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Estimated Amortization Expense
2018	$ 96
2019	93
2020	90
2021	87
2022	83
Thereafter	197
Total	$ 646	$ 744	$ 845	$ 1