SECURITIES - Securities Available for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	$ 298,212	$ 310,401
Estimated Fair Value	293,627	303,402
Unrealized Gains	785	806
Unrealized Losses	5,370	7,805
Amortized Cost
Within one year	16,998
After one, but within five years	21,048
After five, but within ten years	12,700
After ten years	17,923
Total	297,947
Fair Value
Within one year	16,990
After one, but within five years	21,074
After five, but within ten years	12,746
After ten years	18,064
Total	293,091
Proceeds from sales and calls of securities resulting in gains or losses [Abstract]
Proceeds	5,576	40,413	$ 72,718
Gross gains	109	989	410
Gross losses	0	(2)	(38)
Tax expense	41	373	$ 142
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	15,492	17,300
Estimated Fair Value	15,491	17,455
Unrealized Gains	20	155
Unrealized Losses	21	0
Mortgage-backed securities, residential
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	224,939	253,156
Estimated Fair Value	219,909	245,866
Unrealized Gains	136	202
Unrealized Losses	5,166	7,492
Amortized Cost
Without single maturity date	224,939
Fair Value
Without single maturity date	219,909
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	52,928	38,843
Estimated Fair Value	53,132	38,740
Unrealized Gains	355	209
Unrealized Losses	151	312
Corporate bonds and notes
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	249	249
Estimated Fair Value	251	250
Unrealized Gains	2	1
Unrealized Losses	0	0
SBA loan pools
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	4,339	568
Estimated Fair Value	4,308	570
Unrealized Gains	1	3
Unrealized Losses	32	1
Amortized Cost
Without single maturity date	4,339
Fair Value
Without single maturity date	4,308
Corporate stocks
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	265	285
Estimated Fair Value	536	521
Unrealized Gains	271	236
Unrealized Losses	$ 0	$ 0