INVESTMENT SECURITIES - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost
Due within one year	$ 0
Due after one year through five years	309
Due after five years through ten years	12,997
Due after ten years	20,542
Amortized cost	33,848	$ 38,198
Fair Value
Due within one year	0
Due after one year through five years	291
Due after five years through ten years	12,567
Due after ten years	19,722
Total available for sale	32,580	37,991
Amortized Cost
Due within one year	0
Due after one year through five years	0
Due after five years through ten years	1,099
Due after ten years	0
Amortized cost	1,099	2,268
Fair Value
Due within one year	0
Due after one year through five years	0
Due after five years through ten years	1,253
Due after ten years	0
Total held to maturity	$ 1,253	$ 2,468