INVESTMENT SECURITIES - Fair value of investment securities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Available for Sale, Amortized Cost
Due in one year or less	$ 1,001
Due after one year through five years	5,953
Due after five years through ten years	35,598
Due after ten years	113,416
Total, Amortized Cost	155,968
Available for Sale, Estimated Fair Value
Due in one year or less	1,008
Due after one year through five years	5,934
Due after five years through ten years	35,789
Due after ten years	113,026
Total, Estimated Fair Value	$ 155,757