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Investments (Available-For-Sale Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Reclassifications from AOCI to net income (loss):    
Amortized Cost $ 3,850,889 $ 2,361,575
Total Fair Value 3,904,136 2,457,531
U.S. Treasury obligations    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 241,696 104,097
Due in one year or less 19,945  
Due after one year through five years 133,884  
Due after five years through ten years 86,726  
Due after ten years 2,150  
Total Fair Value 242,705 107,059
U.S. Government-sponsored enterprise obligations    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 20,509 12,103
Due in one year or less 3,826  
Due after one year through five years 11,363  
Due after five years through ten years 5,134  
Due after ten years 145  
Total Fair Value 20,468 12,261
State and municipal bonds    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 513,111 316,022
Due in one year or less 15,273  
Due after one year through five years 174,664  
Due after five years through ten years 188,717  
Due after ten years 144,053  
Total Fair Value 522,707 332,920
Corporate debt    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 1,928,543 1,267,992
Due in one year or less 119,700  
Due after one year through five years 927,016  
Due after five years through ten years 809,889  
Due after ten years 106,508  
Total Fair Value 1,963,113 1,329,342
Residential mortgage-backed securities    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 475,368 269,752
Total Fair Value 477,909 276,541
Agency commercial mortgage-backed securities    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 14,531 12,623
Total Fair Value 14,942 13,310
Other commercial mortgage-backed securities    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 216,595 109,244
Total Fair Value 219,024 113,092
Other asset-backed securities    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 440,536 269,742
Total Fair Value $ 443,268 $ 273,006