SECURITIES - Securities Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Securities held to maturity	$ 3,420	$ 4,875
Unrealized Gains	23	0
Unrealized Losses	0	17
Securities held to maturity	3,443	4,858
Amortized Cost [Abstract]
Within one year	1,340
After one, but within five years	2,080
After five, but within ten years	0
After ten years	0
Total	3,420
Securities held to maturity	3,420	4,875
Fair Value [Abstract]
Within one year	1,340
After one, but within five years	2,103
After five, but within ten years	0
After ten years	0
Total	3,443
Securities held to maturity	3,443	4,858
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Securities held to maturity	1,125	3,020
Unrealized Gains	0	0
Unrealized Losses	0	0
Securities held to maturity	1,125	3,020
Amortized Cost [Abstract]
Securities held to maturity	1,125	3,020
Fair Value [Abstract]
Securities held to maturity	1,125	3,020
Time deposits with other financial institutions
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Securities held to maturity	2,295	1,855
Unrealized Gains	23	0
Unrealized Losses	0	17
Securities held to maturity	2,318	1,838
Amortized Cost [Abstract]
Securities held to maturity	2,295	1,855
Fair Value [Abstract]
Securities held to maturity	2,318	$ 1,838
Mortgage-backed securities, residential
Amortized Cost [Abstract]
Without single maturity date	0
SBA loan pools
Amortized Cost [Abstract]
Without single maturity date	$ 0