GOODWILL, CORE DEPOSIT INTANGIBLES AND OTHER INTANGIBLE ASSETS (Changes in Capitalized Mortgage and Commercial Servicing Rights) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	$ 5,621	$ 29,363
Originations	3,383	893
Amortization	(2,037)	(3,168)
Sale of mortgage servicing rights	0	(20,556)
Valuation allowance on servicing rights	(1,778)	(911)
Balance at end of period	5,189	5,621
Fair value of mortgage servicing rights	$ 5,189	$ 5,621
Servicing rights, net to servicing portfolio (as a percent)	0.70%	0.91%
Commercial Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	$ 1,115	$ 1,709
Originations	102	118
Amortization	(354)	(712)
Balance at end of period	863	1,115
Fair value of mortgage servicing rights	$ 1,288	$ 1,594
Servicing rights, net to servicing portfolio (as a percent)	1.30%	1.36%