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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
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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