SECURITIES - Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	$ 269,529	$ 248,496
Unrealized Gains	911	226
Unrealized Losses	3,719	6,464
Estimated Fair Value	266,721	242,258
Amortized Cost [Abstract]
Within one year	11,600
After one, but within five years	13,500
After five, but within ten years	26,902
After ten years	1,473
Total	53,475
Amortized Cost	269,529	248,496
Fair Value [Abstract]
Within one year	11,592
After one, but within five years	13,590
After five, but within ten years	27,402
After ten years	1,485
Total	54,069
Estimated Fair Value	266,721	242,258
Obligations of U.S. Government and U.S. Government sponsored enterprises
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	5,492	5,489
Unrealized Gains	9	10
Unrealized Losses	13	27
Estimated Fair Value	5,488	5,472
Amortized Cost [Abstract]
Amortized Cost	5,492	5,489
Fair Value [Abstract]
Estimated Fair Value	5,488	5,472
Mortgage-backed securities, residential
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	207,277	189,111
Unrealized Gains	283	146
Unrealized Losses	3,622	6,065
Estimated Fair Value	203,938	183,192
Amortized Cost [Abstract]
Without single maturity date	207,277
Amortized Cost	207,277	189,111
Fair Value [Abstract]
Without single maturity date	203,938
Estimated Fair Value	203,938	183,192
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	47,733	44,390
Unrealized Gains	619	70
Unrealized Losses	20	308
Estimated Fair Value	48,332	44,152
Amortized Cost [Abstract]
Amortized Cost	47,733	44,390
Fair Value [Abstract]
Estimated Fair Value	48,332	44,152
Corporate bonds and notes
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	250	249
Unrealized Gains	0	0
Unrealized Losses	1	2
Estimated Fair Value	249	247
Amortized Cost [Abstract]
Amortized Cost	250	249
Fair Value [Abstract]
Estimated Fair Value	249	247
SBA loan pools
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	8,777	9,257
Unrealized Gains	0	0
Unrealized Losses	63	62
Estimated Fair Value	8,714	9,195
Amortized Cost [Abstract]
Without single maturity date	8,777
Amortized Cost	8,777	9,257
Fair Value [Abstract]
Without single maturity date	8,714
Estimated Fair Value	$ 8,714	$ 9,195