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SECURITIES AVAILABLE FOR SALE - Securities Impairment (Details) - Available-for-sale Securities - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Estimated credit losses as of period start $ 1,697 $ 1,697 $ 3,180
Reductions for securities paid off during the period 0 0 1,483
Estimated credit losses at end of the period $ 1,697 $ 1,697 $ 1,697