GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Servicing Asset at Amortized Value, Balance [Roll Forward]
Servicing Asset at Amortized Cost, Additions		$ 159		$ 175		$ 168
Serviced Loans
Servicing Assets at Amortized Value [Line Items]
Loans serviced for others		2,770,000		2,640,000
Mortgage Servicing Rights
Servicing Assets at Amortized Value [Line Items]
Custodial accounts		3,200		3,800
Servicing Asset at Amortized Value, Balance [Roll Forward]
Balance, beginning of the year		15,223	[1]	14,148	[1]	14,638
Amounts capitalized		7,260		8,572		4,392
Amortization		(6,580)		(7,672)		(5,050)	[2]
Valuation adjustments in the period		(1,144)		0		0
Balance, end of the year	[1]	$ 17,206		$ 15,223		$ 14,148

[1] (2)    There was no valuation allowance on mortgage servicing rights as of both December 31, 2021 and 2020.

[2] Amortization of mortgage servicing rights is recorded as a reduction of loan servicing income. Any unamortized balance is fully written off if the loan repays in full.