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Investments (Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities By Length of Time) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Percentage Decline in Fair Value Percentage 10.00% 10.00%
Available-for-sale Securities [Member]    
AFS Fair Value, Less than 12 Months $ 5,060,440 $ 1,376,128
AFS Unrealized Losses, Less than 12 months 405,632 14,849
AFS Fair Value, 12 months or longer 764,813 85,122
AFS Unrealized Losses, 12 months or longer 131,556 2,505
AFS Fair Value 5,825,253 1,461,250
AFS Unrealized Losses 537,188 17,354
Available-for-sale Securities [Member] | U.S. Government and Government Agencies [Member]    
AFS Fair Value, Less than 12 Months 166,975 34,857
AFS Unrealized Losses, Less than 12 months 13,658 746
AFS Fair Value, 12 months or longer 16,011 7,827
AFS Unrealized Losses, 12 months or longer 6,668 399
AFS Fair Value 182,986 42,684
AFS Unrealized Losses 20,326 1,145
Available-for-sale Securities [Member] | Foreign Government [Member]    
AFS Fair Value, Less than 12 Months 5,573 2,000
AFS Unrealized Losses, Less than 12 months 608 84
AFS Fair Value, 12 months or longer 2,456 1,061
AFS Unrealized Losses, 12 months or longer 699 39
AFS Fair Value 8,029 3,061
AFS Unrealized Losses 1,307 123
Available-for-sale Securities [Member] | Obligations of States and Political Subdivisions [Member]    
AFS Fair Value, Less than 12 Months 681,795 25,837
AFS Unrealized Losses, Less than 12 months 43,767 235
AFS Fair Value, 12 months or longer 16,618 0
AFS Unrealized Losses, 12 months or longer 4,234 0
AFS Fair Value 698,413 25,837
AFS Unrealized Losses 48,001 235
Available-for-sale Securities [Member] | Corporate Securities [Member]    
AFS Fair Value, Less than 12 Months 1,889,492 300,549
AFS Unrealized Losses, Less than 12 months 164,197 4,903
AFS Fair Value, 12 months or longer 133,223 2,520
AFS Unrealized Losses, 12 months or longer 32,612 50
AFS Fair Value 2,022,715 303,069
AFS Unrealized Losses 196,809 4,953
Available-for-sale Securities [Member] | Collateralized Loan Obligations and Other Asset-Backed Securities [Member]    
AFS Fair Value, Less than 12 Months 916,423 663,976
AFS Unrealized Losses, Less than 12 months 69,155 4,934
AFS Fair Value, 12 months or longer 411,283 53,368
AFS Unrealized Losses, 12 months or longer 52,565 1,350
AFS Fair Value 1,327,706 717,344
AFS Unrealized Losses 121,720 6,284
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member]    
AFS Fair Value, Less than 12 Months 887,229 236,010
AFS Unrealized Losses, Less than 12 months 76,432 2,931
AFS Fair Value, 12 months or longer 108,041 20
AFS Unrealized Losses, 12 months or longer 22,833 1
AFS Fair Value 995,270 236,030
AFS Unrealized Losses 99,265 2,932
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]    
AFS Fair Value, Less than 12 Months 512,953 112,899
AFS Unrealized Losses, Less than 12 months 37,815 1,016
AFS Fair Value, 12 months or longer 77,181 20,326
AFS Unrealized Losses, 12 months or longer 11,945 666
AFS Fair Value 590,134 133,225
AFS Unrealized Losses $ 49,760 $ 1,682