GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Changes in capitalized mortgage and commercial servicing rights) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Mortgage servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	$ 5,189	$ 5,621
Originations	1,055	2,571
Amortization	(1,029)	(1,693)
Valuation adjustment	586	(1,676)
Balance at end of period	5,801	$ 4,823
Fair value of mortgage servicing rights	$ 5,800		$ 5,200
Servicing rights, net to servicing portfolio (as a percent)	0.82%	0.68%
Commercial servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	$ 863	$ 1,115
Originations	0	62
Amortization	(313)	(248)
Balance at end of period	550	929
Fair value of mortgage servicing rights	$ 958	$ 1,497	$ 1,300
Servicing rights, net to servicing portfolio (as a percent)	1.04%	1.31%