INCOME TAXES AND DEFERRED TAXES INCOME TAXES AND DEFERRED TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax credit investments	$ 21,359		$ 21,359		$ 17,360
Unfunded commitments—tax credit investments	15,700		15,700		$ 12,726
Tax credits and other tax benefits recognized	494	$ 364	988	$ 728
Tax credit amortization expense included in provision for income taxes	$ 405	$ 288	$ 810	$ 575