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INVESTMENT SECURITIES INVESTMENTS - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  |  | $ 117,800 | $ 519,100 | $ 290,700
Available-for-sale Securities, Gross Realized Gains |  |  | 900 | 2,100 | 500
Available-for-sale Securities, Gross Realized Losses |  |  | 800 | 2,100 | 600
Available For Sale Securities Net Realized Gain Loss Tax Provision |  |  | 19 | (7) | 37
Securities transferred from HTM to AFS | $ 268,700 | $ 372,100 | 0 | 268,703 | $ 372,128
Realized gain (loss) on debt securities transferred from HTM to AFS | $ 200 |  |  |  |
Pledged Financial Instruments, Not Separately Reported, Securities |  |  | $ 1,500,000 | $ 1,100,000 |
NumberOfSecuritiesInSecurityPortfolio |  |  | 1,351 | 1,273 |
NumberOfSecuritiesInUnrealizedLossPosition |  |  | 94 | 140 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  |  | $ 0 |  |
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings |  |  |  | $ 0 |

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