INCOME TAXES AND DEFERRED TAXES INCOME TAXES AND DEFERRED TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax credit investments	$ 8,648		$ 8,648		$ 7,311
Unfunded commitments—tax credit investments	4,361		4,361		$ 4,417
Tax credits and other tax benefits recognized	364	$ 285	1,092	$ 855
Tax credit amortization expense included in provision for income taxes	$ 288	$ 199	$ 863	$ 597