OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Summary of the AOCI balances, net of tax
Balance at beginning of period			$ 576,547
Current Year Change	$ (341)	$ 16	925	$ 49
Balance at end of period	600,560		600,560
Accumulated Other Comprehensive Income
Summary of the AOCI balances, net of tax
Balance at beginning of period			2,049	4,315
Current Year Change			925	49
Balance at end of period	2,974	4,364	2,974	4,364
Unrealized gain on securities available for sale
Summary of the AOCI balances, net of tax
Balance at beginning of period			1,727	3,839
Current Year Change			1,247	378
Balance at end of period	2,974	4,217	2,974	4,217
Unrealized gain on security available for sale for which a portion of an other-than-temporary impairment has been recognized in earnings
Summary of the AOCI balances, net of tax
Balance at beginning of period			712	792
Current Year Change			(58)	(55)
Balance at end of period	654	737	654	737
Unrealized loss on cash flow hedge
Summary of the AOCI balances, net of tax
Balance at beginning of period			(390)	(316)
Current Year Change			(264)	(274)
Balance at end of period	$ (654)	$ (590)	$ (654)	$ (590)