SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INCOME TAXES, INTANGIBLE ASSETS AND SEGMENTS (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment $ / shares	Dec. 31, 2019 $ / shares	Mar. 31, 2019 $ / shares
Income Taxes
Tax benefit | $	$ 0
Stock Split
Common stock, par value (in dollars per share) | $ / shares	$ 0	$ 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