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INVESTMENT SECURITIES - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities | $ 764,400,000 |  |  |  | $ 598,300,000 |  |  | $ 764,400,000 | $ 598,300,000 |
Held to maturity security carrying value | 108,680,000 |  |  |  |  |  |  | 108,680,000 |  |
Sale of available for sale securities | 0 |  |  |  | 0 |  |  | 0 | 0 |
Other than temporary impairment charges |  |  |  |  |  |  |  | 0 | 0 | $ 0
Investment with fair value classified as equity security | 14,685,000 |  |  |  | 15,117,000 |  |  | 14,685,000 | 15,117,000 |
Securities gains/(losses), net | (139,000) | $ (70,000) | $ 42,000 | $ (265,000) | (42,000) | $ 125,000 | $ 198,000 | (432,000) | 281,000 | 117,000
CRA Investment Fund [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Investment with fair value classified as equity security | $ 14,700,000 |  |  |  | $ 15,100,000 |  |  | 14,700,000 | 15,100,000 |
Securities gains/(losses), net |  |  |  |  |  |  |  | $ (432,000) | $ 281,000 | $ 117,000

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