SECURITIES - Securities Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Amortized Cost	$ 3,806	$ 3,781
Unrealized Gains	0	0
Unrealized Losses	16	5
Securities held to maturity	3,790	3,776
Amortized Cost [Abstract]
Within one year	884
After one, but within five years	2,689
After five, but within ten years	233
After ten years	0
Total	3,806
Amortized Cost	3,806	3,781
Fair Value [Abstract]
Within one year	882
After one, but within five years	2,675
After five, but within ten years	233
After ten years	0
Total	3,790
Securities held to maturity	3,790	3,776
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Amortized Cost	1,481	1,946
Unrealized Gains	0	0
Unrealized Losses	0	0
Securities held to maturity	1,481	1,946
Amortized Cost [Abstract]
Amortized Cost	1,481	1,946
Fair Value [Abstract]
Securities held to maturity	1,481	1,946
Time deposits with other financial institutions
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Amortized Cost	2,325	1,835
Unrealized Gains	0	0
Unrealized Losses	16	5
Securities held to maturity	2,309	1,830
Amortized Cost [Abstract]
Amortized Cost	2,325	1,835
Fair Value [Abstract]
Securities held to maturity	2,309	$ 1,830
Mortgage-backed securities, residential
Amortized Cost [Abstract]
Without single maturity date	0
SBA loan pools
Amortized Cost [Abstract]
Without single maturity date	$ 0