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INVESTMENT SECURITIES - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Investments in Securities |  |  |  |  |  |
Available-for-sale Securities, Gross Realized Gains |  |  |  | $ 7,000 |  |
Total available-for-sale securities sold |  |  |  | 4,900,000 |  |
Fair Value of Debt Securities Reported Less Than Their Historical Cost | $ 493,800,000 |  |  | $ 493,800,000 |  | $ 173,900,000
Debt Securities Reported Less Than Their Historical Cost Percent of Investment Portfolio | 95.10% |  |  | 95.10% |  | 34.70%
Securities transferred from available for sale portfolio to held to maturity portfolio |  | $ 226,500,000 |  |  |  |
Net unrealized gains on transfers |  | 1,000,000.0 |  | $ 323,000 |  |
Net of income tax | $ 249,000 | 775,000 |  | $ 249,000 |  |
Realized gain or loss on transfers |  | $ 0 |  |  |  |
Available for sale securities sold | $ 0 |  | $ 0 |  | $ 0 |

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