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SECURITIES AVAILABLE FOR SALE - Securities Impairment (Details) - Available-for-sale Securities - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Estimated credit losses as of prior year-end     $ 1,697 $ 1,697
Reductions for securities paid off during the period $ 0 $ 0 0 0
Estimated credit losses at end of the period $ 1,697 $ 1,697 $ 1,697 $ 1,697