OTHER COMPREHENSIVE INCOME (LOSS) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts Reclassified from AOCI
Realized (losses) gains on sale of available for sale securities	$ 449	$ (8)	$ (1,090)
Income before income taxes	54,286	31,889	21,002
Income tax effect	(18,795)	(10,778)	(7,239)
Net income	35,491	21,111	13,763
Amount Reclassified from Accumulated Other Comprehensive Income
Amounts Reclassified from AOCI
Income before income taxes	(879)	(1,023)	(1,537)
Income tax effect	356	414	611
Net income	(523)	(609)	(926)
Net securities gains (losses) | Amount Reclassified from Accumulated Other Comprehensive Income
Amounts Reclassified from AOCI
Realized (losses) gains on sale of available for sale securities	449	(8)	(1,090)
Amortization of defined benefit pension plan and the defined benefit plan component of the SERP | Amount Reclassified from Accumulated Other Comprehensive Income
Amounts Reclassified from AOCI
Amortization of prior service cost	77	77	77
Transition obligation	(28)	(27)	(27)
Amortization of net loss	(433)	(408)	(27)
Realized losses on cash flow hedges | Amount Reclassified from Accumulated Other Comprehensive Income
Amounts Reclassified from AOCI
Realized (losses) gains on sale of available for sale securities	$ (944)	$ (657)	$ (470)