XML 38 R39.htm IDEA: XBRL DOCUMENT v3.19.3
INVESTMENTS (Schedule of Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-sale, Amortized Cost    
Due in one year or less $ 0  
Due after one year through five years 82,995  
Due after five years through ten years 186,981  
Due after ten years 634,012  
Amortized cost, total 903,988  
Available-for-sale, Fair Value    
Due in one year or less 0  
Due after one year through five years 83,568  
Due after five years through ten years 189,976  
Due after ten years 639,979  
Fair value, total 913,523  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 1,303  
Due after ten years 0  
Amortized Cost 1,303 $ 1,307
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 1,352  
Due after ten years 0  
Debt Securities, Held-to-maturity, Fair Value $ 1,352 $ 1,291