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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
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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