INCOME TAXES AND DEFERRED TAXES INCOME TAXES AND DEFERRED TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax credit investments	$ 8,935		$ 8,935		$ 7,311
Unfunded commitments—tax credit investments	4,977		4,977		$ 4,417
Tax credits and other tax benefits recognized	364	$ 285	728	$ 570
Tax credit amortization expense included in provision for income taxes	$ 288	$ 199	$ 575	$ 398