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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INTANGIBLE ASSETS AND SEGMENTS (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Nov. 21, 2018
Dec. 31, 2019
USD ($)
segment
$ / shares
Dec. 31, 2018
$ / shares
Income Taxes      
Tax benefit | $   $ 0.0  
Stock Split      
Stock Split ratio 2    
Common stock, par value (in dollars per share) | $ / shares   $ 0 $ 0
Operating Segments      
Number of reportable operating segments | segment   1  
Minimum      
Income Taxes      
Useful life of core deposit intangible assets   10 years  
Maximum      
Income Taxes      
Useful life of core deposit intangible assets   15 years