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Investments (Available-For-Sale Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Reclassifications from AOCI to net income (loss):    
Amortized Cost $ 3,830,737 $ 3,814,847
Total Fair Value 3,531,815 3,833,722
U.S. Treasury obligations    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 238,350 239,765
Due in one year or less 20,903  
Due after one year through five years 124,255  
Due after five years through ten years 75,245  
Due after ten years 1,341  
Total Fair Value 221,744 238,507
U.S. Government-sponsored enterprise obligations    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 18,820 20,467
Due in one year or less 1,903  
Due after one year through five years 11,775  
Due after five years through ten years 3,831  
Due after ten years 124  
Total Fair Value 17,633 20,234
State and municipal bonds    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 504,920 511,750
Due in one year or less 30,387  
Due after one year through five years 162,224  
Due after five years through ten years 165,598  
Due after ten years 114,959  
Total Fair Value 473,168 519,196
Corporate debt    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 1,961,538 1,884,455
Due in one year or less 165,213  
Due after one year through five years 823,381  
Due after five years through ten years 698,491  
Due after ten years 102,923  
Total Fair Value 1,790,008 1,898,556
Residential mortgage-backed securities    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 426,956 455,438
Total Fair Value 385,225 453,941
Agency commercial mortgage-backed securities    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 12,542 13,909
Total Fair Value 11,940 14,141
Other commercial mortgage-backed securities    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 224,848 231,226
Total Fair Value 208,487 231,483
Other asset-backed securities    
Reclassifications from AOCI to net income (loss):    
Amortized Cost 442,763 457,837
Total Fair Value $ 423,610 $ 457,664