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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities | $ 374,600,000 |  |  |  | $ 337,100,000 |  |  |  | $ 374,600,000 | $ 337,100,000 |
Other than temporary impairment charges |  |  |  |  |  |  |  |  | 0 | 0 | $ 0
Securities gains/(losses), net | $ (45,000) | $ 34,000 | $ 69,000 | $ 59,000 | $ 46,000 | $ (325,000) | $ (36,000) | $ (78,000) | 117,000 | (393,000) |
CRA Investment Fund [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities gains/(losses), net |  |  |  |  |  |  |  |  | $ 117,000 | $ (105,000) |

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