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BUSINESS COMBINATIONS - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 18, 2021 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) branch office | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of Operated Banking Offices | office |  | 7 |  |  |
Number Of Branches | branch |  | 3 |  |  |
Goodwill |  | $ 94,301 | $ 37,144 | $ 37,144 | $ 37,144
Merger-related costs |  | 15,869 | 0 | 0 |
Core Deposits |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Core deposit intangibles acquired during the year |  | $ 5,054 | $ 0 | $ 0 |
Amortization of intangible assets estimated useful life |  | 10 years |  |  |
PMBC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisitions shares (in shares) | shares | 23,713,437 |  |  |  |
Business combination, acquired entity, aggregate shares converted, conversion ratio | 50.00% |  |  |  |
Payments to acquire businesses, gross | $ 3,200 |  |  |  |
Shares paid as merger consideration (in shares) | shares | 11,856,713 |  |  |  |
Estimated fair value of shares issued | $ 222,200 |  |  |  |
Consideration paid | $ 225,384 |  |  |  |
Estimated fair value based upon closing price (in dollars per share) | $ / shares | $ 18.74 |  |  |  |
Goodwill | $ 57,157 |  |  |  |
Amortization of intangible assets estimated useful life |  | 10 years |  |  |
Merger-related costs |  | $ 15,900 |  |  |
PMBC | Core Deposits |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Core deposit intangibles acquired during the year |  | $ 5,100 |  |  |

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