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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Apr. 30, 2020 | Nov. 30, 2019
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 856,491 | $ 943,623 |  |  |
Fair Value Asset (Liability) | 1,660 | (1,109) |  |  |
Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  |  | $ 25,000 | $ 50,000
Designated as hedging instrument | Cash flow hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 125,000 | 125,000 |  |  |
Fair Value Asset (Liability) | (365) | (877) |  |  |
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 75,000 | $ 75,000 |  |  |
Weighted Average Maturity (in years) | 2 years 9 months 18 days | 3 years |  |  |
Fair Value Asset (Liability) | $ 2,727 | $ (121) |  |  |
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 50,000 | $ 50,000 |  |  |
Weighted Average Maturity (in years) | 4 years | 4 years 2 months 12 days |  |  |
Fair Value Asset (Liability) | $ (3,092) | $ (756) |  |  |
Designated as hedging instrument | Fair Value Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 37,190 | 37,190 |  |  |
Fair Value Asset (Liability) | 1,829 | (530) |  |  |
Designated as hedging instrument | Fair Value Hedging | Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 37,190 | $ 37,190 | $ 37,200 |  |
Weighted Average Maturity (in years) | 7 years 3 months 18 days | 7 years 7 months 6 days |  |  |
Fair Value Asset (Liability) | $ 1,829 | $ (530) |  |  |
Hedged Asset, Fair Value Hedge | 34,976 | 39,726 |  |  |
Cumulative amount of fair value hedging adjustment in carrying amount | (2,214) | 2,536 |  |  |
Designated as hedging instrument | Economic hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 685,420 | 767,374 |  |  |
Fair Value Asset (Liability) | 201 | 15 |  |  |
Designated as hedging instrument | Economic hedges | Forward sale commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 9,450 | $ 16,600 |  |  |
Weighted Average Maturity (in years) | 2 months 12 days | 1 month 6 days |  |  |
Fair Value Asset (Liability) | $ 201 | $ 15 |  |  |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | MNA counterparty |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 230,882 | $ 260,102 |  |  |
Weighted Average Maturity (in years) | 6 years 3 months 18 days | 6 years 2 months 12 days |  |  |
Fair Value Asset (Liability) | $ (10,274) | $ (9,429) |  |  |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | RPA counterparty |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 107,103 | $ 115,285 |  |  |
Weighted Average Maturity (in years) | 7 years | 6 years 8 months 12 days |  |  |
Fair Value Asset (Liability) | $ (1,190) | $ (4,421) |  |  |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | Customer |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 337,985 | $ 375,387 |  |  |
Weighted Average Maturity (in years) | 6 years 6 months | 6 years 4 months 24 days |  |  |
Fair Value Asset (Liability) | $ 11,464 | $ 13,850 |  |  |
Not designated as hedging instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 8,881 | 14,059 |  |  |
Fair Value Asset (Liability) | (5) | 283 |  |  |
Not designated as hedging instrument | Interest Rate Lock Commitment |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 8,881 | $ 14,059 |  |  |
Weighted Average Maturity (in years) | 3 months 18 days | 1 month 6 days |  |  |
Fair Value Asset (Liability) | $ (5) | $ 283 |  |  |

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