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INVESTMENT SECURITIES INVESTMENTS - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  |  | $ 375,276 | $ 122,248 | $ 519,136
Debt Securities, Available-for-sale, Realized Gain |  |  | 6,800 | 900 | 2,100
Debt Securities, Available-for-sale, Realized Loss |  |  | 7,600 | 800 | 2,100
Available For Sale Securities Net Realized Gain Loss Tax Provision |  |  | (173) | 19 | (7)
Securities transferred from HTM to AFS |  | $ 268,700 | 0 | 0 | $ 268,703
Realized gain (loss) on debt securities transferred from HTM to AFS | $ 200 |  |  |  |
Pledged Financial Instruments, Not Separately Reported, Securities |  |  | 1,500,000 | 1,511,322 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  |  | $ 0 | $ 0 |
NumberOfSecuritiesInSecurityPortfolio |  |  | 1,418 | 1,351 |
NumberOfSecuritiesInUnrealizedLossPosition |  |  | 327 | 94 |
Debt Securities, Held-to-maturity, Nonaccrual |  |  | $ 0 | $ 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  |  | (485) | 0 |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale |  |  |  | 117,800 |
Other securities |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  |  | $ (485) | $ 0 |

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