OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Summary of the AOCI balances, net of tax
Balance at beginning of period	$ 632,424
Current Year Change	(1,833)	$ 554
Balance at end of period	653,254
Accumulated Other Comprehensive Income
Summary of the AOCI balances, net of tax
Balance at beginning of period	416	687
Current Year Change	(1,833)	554
Balance at end of period	(1,417)	1,241
Unrealized gain (loss) on securities available for sale
Summary of the AOCI balances, net of tax
Balance at beginning of period	(604)	237
Current Year Change	(2,011)	459
Balance at end of period	(2,615)	696
Unrealized gain (loss) 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	1,093	706
Current Year Change	(1)	34
Balance at end of period	1,092	740
Unrealized gain (loss) on cash flow hedge
Summary of the AOCI balances, net of tax
Balance at beginning of period	(73)	(256)
Current Year Change	179	61
Balance at end of period	$ 106	$ (195)