ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number Of Securities Determined To Be Other Than Temporarily Impaired \| security	0	0
Impairment Of Correspondent Bank Stock \| $	$ 0	$ 0
Customer concentration \| Loan portfolio
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Concentration risk (as a percent)	66.90%	71.70%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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