INCOME TAXES AND DEFERRED TAXES INCOME TAXES AND DEFERRED TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax credit investments	$ 20,954		$ 20,954		$ 17,360
Unfunded commitments—tax credit investments	14,911		14,911		$ 12,726
Tax credits and other tax benefits recognized	494	$ 364	1,482	$ 1,092
Tax credit amortization expense included in provision for income taxes	$ 405	$ 288	$ 1,215	$ 863