OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Summary of the AOCI balances, net of tax
Balance at beginning of period			$ 604,406
Current Year Change	$ 311	$ 187	865	$ 1,266
Balance at end of period	626,891		626,891
Accumulated Other Comprehensive Income
Summary of the AOCI balances, net of tax
Balance at beginning of period			687	2,049
Current Year Change			865	1,266
Balance at end of period	1,552	3,315	1,552	3,315
Unrealized gain on securities available for sale
Summary of the AOCI balances, net of tax
Balance at beginning of period			237	1,727
Current Year Change			733	1,763
Balance at end of period	970	3,490	970	3,490
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			706	712
Current Year Change			100	(96)
Balance at end of period	806	616	806	616
Unrealized loss on cash flow hedge
Summary of the AOCI balances, net of tax
Balance at beginning of period			(256)	(390)
Current Year Change			32	(401)
Balance at end of period	$ (224)	$ (791)	$ (224)	$ (791)