INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value - Available-for-Sale (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Amortized Cost
Due in one year or less	$ 2,166
Due after one year through five years	11,341
Due after five years through ten years	49,661
Due after ten years	279,148
Amortized Cost	342,316
Fair Value
Due in one year or less	2,179
Due after one year through five years	11,540
Due after five years through ten years	51,053
Due after ten years	275,042
Securities available-for-sale	$ 339,814