INVESTMENT SECURITIES - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Available for Sale, Amortized Cost
Due in one year or less	$ 4,696
Due after one year to five years	43,748
Due after five years to ten years	49,777
Due after ten years	11,154
Total amortized cost	109,375
Available for Sale, Fair Value
Due in one year or less	4,684
Due after one year to five years	43,609
Due after five years to ten years	49,063
Due after ten years	11,272
Total fair value	$ 108,628