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SECURITIES AVAILABLE FOR SALE - Securities Impairment (Details) - Available-for-sale Securities - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings      
Estimated credit losses as of prior year-end $ 1,697 $ 1,697 $ 1,697
Reductions for securities paid off during the period 0 0 0
Estimated credit losses at end of the period $ 1,697 $ 1,697 $ 1,697