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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassified from AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Details about AOCI Components                      
Investment income $ 3,113 $ 9,093 $ 7,669 $ 6,655 $ 6,321 $ 6,292 $ 4,917 $ 3,673 $ 26,530 $ 21,203 $ 3,932
Total reclassifications                 641 317 55
Unrealized Gain (Loss) on Securities                      
Details about AOCI Components                      
Total reclassifications                 641 317 55
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) on Securities                      
Details about AOCI Components                      
Investment income                 $ 641 $ 317 $ 55