PRE TAX EXPENSE (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense		$ 3,333	$ 2,965	$ 2,490
Related tax benefits recognized in earnings		1,362	1,211	1,122
Stock options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense		76	72	0
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	[1]	2,730	2,590	2,296
Restricted stock awards [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense		$ 527	$ 303	$ 194

[1] Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards.