OTHER COMPREHENSIVE INCOME - AOCI Changes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of the AOCI balances, net of tax
Balance at beginning of period	$ 689,934	$ 632,424	$ 604,406
Current Year Change	4,095	(1,413)	(271)
Balance at end of period	764,244	689,934	632,424
Accumulated Other Comprehensive Income
Summary of the AOCI balances, net of tax
Balance at beginning of period	(997)	416	687
Current Year Change	4,095	(1,413)
Balance at end of period	3,098	(997)	416
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	4,376	(1,561)
Balance at end of period	2,211	(2,165)	(604)
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	(114)	(15)
Balance at end of period	964	1,078	1,093
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	(167)	163
Balance at end of period	$ (77)	$ 90	$ (73)