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ACQUISITIONS - General Information (Details) $ / shares in Units, $ in Thousands | Feb. 04, 2020 USD ($) location $ / shares | Oct. 21, 2019 USD ($) location shares | May 24, 2019 USD ($) location shares | Nov. 30, 2018 | Dec. 31, 2020 location
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Business Combination, Description [Abstract] |  |  |  |  |
Number of offices and branches | location |  |  |  |  | 34
Grand Mountain Bancshares, Inc. |  |  |  |  |
Business Acquisition, Date of Acquisition [Abstract] |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Feb. 04, 2020 |  |  |  |
Business Acquisition, Date of Acquisition Agreement | Nov. 04, 2019 |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |
Number of offices and branches | location | 4 |  |  |  |
Business Acquisition, Share Price | $ / shares | $ 3.40 |  |  |  |
Payments to Acquire Businesses, Gross | $ 13,886 |  |  |  |
Business Combination, Consideration Transferred | $ 13,886 |  |  |  |
TIG Bancorp |  |  |  |  |
Business Acquisition, Date of Acquisition [Abstract] |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Oct. 21, 2019 |  |  |
Business Acquisition, Date of Acquisition Agreement |  | Jun. 28, 2019 |  |  |
Business Combination, Description [Abstract] |  |  |  |  |
Number of offices and branches | location |  | 7 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  | 876,803 |  |  |
Payments to Acquire Businesses, Gross |  | $ 20,184 |  |  |
Business Combination, Consideration Transferred |  | $ 39,895 |  |  |
Uniti Financial Corporation |  |  |  |  |
Business Acquisition, Date of Acquisition [Abstract] |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | May 24, 2019 |  |
Business Acquisition, Date of Acquisition Agreement |  |  | Dec. 07, 2018 |  |
Business Combination, Description [Abstract] |  |  |  |  |
Number of offices and branches | location |  |  | 3 |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  | 1,115,006 |  |
Payments to Acquire Businesses, Gross |  |  | $ 37,814 |  |
Business Combination, Consideration Transferred |  |  | $ 62,701 |  |
Bethlehem Financial Corporation |  |  |  |  |
Business Acquisition, Date of Acquisition [Abstract] |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  | Nov. 30, 2018 |
Business Acquisition, Date of Acquisition Agreement |  |  |  | Aug. 10, 2018 |

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