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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) - Core Deposit Intangibles [Member] - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year | $ 3,892 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year One | 3,814 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Two | 2,659 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Three | 1,575 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Four | 904 |  |
Thereafter | 587 |  |
Finite lived assets, net | $ 13,431 | $ 14,855 | $ 21,426

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