GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Expected Amortization, Year One	$ 5,317
Finite-Lived Intangible Asset, Expected Amortization, Year Two	3,814
Finite-Lived Intangible Asset, Expected Amortization, Year Three	2,659
Finite-Lived Intangible Asset, Expected Amortization, Year Four	1,575
Finite-Lived Intangible Asset, Expected Amortization, Year Five	904
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	586
Net carrying amount	14,855
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	$ 14,855	$ 21,426	$ 29,158	$ 32,699