OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Summary of the AOCI balances, net of tax
Balance at beginning of period	$ 689,934	$ 632,424
Current Year Change	2,794	(1,833)
Balance at end of period	717,091	653,254
Accumulated Other Comprehensive Income
Summary of the AOCI balances, net of tax
Balance at beginning of period	(997)	416
Current Year Change	2,794	(1,833)
Balance at end of period	1,797	(1,417)
Unrealized gain (loss) on AFS debt securities
Summary of the AOCI balances, net of tax
Balance at beginning of period	(2,165)	(604)
Current Year Change	2,891	(2,011)
Balance at end of period	726	(2,615)
Unrealized gain (loss) on AFS debt security for which a portion of OTTI has been recognized in earnings
Summary of the AOCI balances, net of tax
Balance at beginning of period	1,078	1,093
Current Year Change	(27)	(1)
Balance at end of period	1,051	1,092
Unrealized gain (loss) on cash flow hedges
Summary of the AOCI balances, net of tax
Balance at beginning of period	90	(73)
Current Year Change	(70)	179
Balance at end of period	$ 20	$ 106