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FAIR VALUE (Held-to-Maturity Financial Instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Changes in valuation inputs or changes in assumptions $ 0   $ 0
Unobservable inputs reconciliation, transfers 0 $ 0  
US Government Obligations and Authorities, Corporate and International Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Held-to-maturity securities, fair value 4,349   4,964
US Government Obligations and Authorities, Corporate and International Securities | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Held-to-maturity securities, fair value 3,435   3,809
US Government Obligations and Authorities, Corporate and International Securities | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Held-to-maturity securities, fair value $ 914   $ 1,155