OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Summary of the AOCI balances, net of tax
Balance at beginning of period	$ 604,406
Current Year Change	554	$ 1,079
Balance at end of period	620,664
Accumulated Other Comprehensive Income
Summary of the AOCI balances, net of tax
Balance at beginning of period	687	2,049
Current Year Change	554	1,079
Balance at end of period	1,241	3,128
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	459	1,490
Balance at end of period	696	3,217
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	706	712
Current Year Change	34	(97)
Balance at end of period	740	615
Unrealized loss on cash flow hedge
Summary of the AOCI balances, net of tax
Balance at beginning of period	(256)	(390)
Current Year Change	61	(314)
Balance at end of period	$ (195)	$ (704)