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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Business Combinations (Details) | Feb. 04, 2020 | Oct. 21, 2019 | May 24, 2019 | Nov. 30, 2018
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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 |  |  |
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 |  |
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 |
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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