SECURITIES - Securities Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	$ 313,739		$ 313,739		$ 310,401
Unrealized Gains	1,445		1,445		806
Unrealized Losses	2,958		2,958		7,805
Estimated Fair Value	312,226		312,226		303,402
Amortized Cost [Abstract]
Within one year	13,067		13,067
After one, but within five years	26,063		26,063
After five, but within ten years	29,621		29,621
After ten years	1,136		1,136
Total	69,887		69,887
Total	313,474		313,474
Fair Value [Abstract]
Within one year	13,135		13,135
After one, but within five years	26,328		26,328
After five, but within ten years	29,944		29,944
After ten years	1,147		1,147
Total	70,554		70,554
Total	311,700		311,700
Proceeds from sales and calls of securities resulting in gains or losses [Abstract]
Proceeds	545	$ 20,709	1,620	$ 36,130
Gross gains	0	75	12	983
Tax expense	0	$ 28	4	$ 371
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	15,494		15,494		17,300
Unrealized Gains	90		90		155
Unrealized Losses	0		0		0
Estimated Fair Value	15,584		15,584		17,455
Mortgage-backed securities, residential
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	239,074		239,074		253,156
Unrealized Gains	480		480		202
Unrealized Losses	2,893		2,893		7,492
Estimated Fair Value	236,661		236,661		245,866
Amortized Cost [Abstract]
Without single maturity date	239,074		239,074
Fair Value [Abstract]
Without single maturity date	236,661		236,661
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	54,144		54,144		38,843
Unrealized Gains	612		612		209
Unrealized Losses	28		28		312
Estimated Fair Value	54,728		54,728		38,740
Corporate bonds and notes
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	249		249		249
Unrealized Gains	0		0		1
Unrealized Losses	7		7		0
Estimated Fair Value	242		242		250
SBA loan pools
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	4,513		4,513		568
Unrealized Gains	2		2		3
Unrealized Losses	30		30		1
Estimated Fair Value	4,485		4,485		570
Amortized Cost [Abstract]
Without single maturity date	4,513		4,513
Fair Value [Abstract]
Without single maturity date	4,485		4,485
Corporate stocks
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	265		265		285
Unrealized Gains	261		261		236
Unrealized Losses	0		0		0
Estimated Fair Value	$ 526		$ 526		$ 521