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INVESTMENT SECURITIES AVAILABLE FOR SALE - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities | $ 598,300,000 |  |  | $ 374,600,000 |  |  |  | $ 598,300,000 | $ 374,600,000 |
Other than temporary impairment charges |  |  |  |  |  |  |  | 0 | 0 | $ 0
Investment with fair value classified as equity security | 15,117,000 |  |  | 10,836,000 |  |  |  | 15,117,000 | 10,836,000 |
Securities gains/(losses), net | (42,000) | $ 125,000 | $ 198,000 | (45,000) | $ 34,000 | $ 69,000 | $ 59,000 | 281,000 | 117,000 | (393,000)
CRA Investment Fund [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Investment with fair value classified as equity security | $ 15,100,000 |  |  | $ 10,800,000 |  |  |  | 15,100,000 | 10,800,000 |
Securities gains/(losses), net |  |  |  |  |  |  |  | $ 281,000 | $ 117,000 | $ (105,000)

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