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FAIR VALUE OF FINANCIAL INSTRUMENTS- Unobservable inputs (Level 3) (Details) - Corporate Securities - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period $ 955 $ 1,923
Total realized in earnings 2 22
Total unrealized in other comprehensive income (30) 7
Net settlements (principal and interest) (2) (22)
Balance, end of period $ 925 $ 1,930