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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, 2023 | Dec. 31, 2022
--- | --- | ---
U.S. Government and Government Agencies [Member] |  |
AFS Fair Value, Less than 12 Months | $ 77,698 | $ 166,975
AFS Unrealized Losses, Less than 12 months | 188 | 13,658
AFS Fair Value, 12 months or longer | 108,578 | 16,011
AFS Unrealized Losses, 12 months or longer | 18,073 | 6,668
AFS Fair Value | 186,276 | 182,986
AFS Unrealized Losses | 18,261 | 20,326
Foreign Government [Member] |  |
AFS Fair Value, Less than 12 Months | 1,552 | 5,573
AFS Unrealized Losses, Less than 12 months | 87 | 608
AFS Fair Value, 12 months or longer | 8,251 | 2,456
AFS Unrealized Losses, 12 months or longer | 1,215 | 699
AFS Fair Value | 9,803 | 8,029
AFS Unrealized Losses | 1,302 | 1,307
Obligations of States and Political Subdivisions [Member] |  |
AFS Fair Value, Less than 12 Months | 137,031 | 681,795
AFS Unrealized Losses, Less than 12 months | 962 | 43,767
AFS Fair Value, 12 months or longer | 290,964 | 16,618
AFS Unrealized Losses, 12 months or longer | 27,965 | 4,234
AFS Fair Value | 427,995 | 698,413
AFS Unrealized Losses | 28,927 | 48,001
Corporate Securities [Member] |  |
AFS Fair Value, Less than 12 Months | 263,423 | 1,889,492
AFS Unrealized Losses, Less than 12 months | 6,369 | 164,197
AFS Fair Value, 12 months or longer | 1,439,422 | 133,223
AFS Unrealized Losses, 12 months or longer | 131,519 | 32,612
AFS Fair Value | 1,702,845 | 2,022,715
AFS Unrealized Losses | 137,888 | 196,809
Collateralized Loan Obligations and Other Asset-Backed Securities [Member] |  |
AFS Fair Value, Less than 12 Months | 278,940 | 916,423
AFS Unrealized Losses, Less than 12 months | 7,120 | 69,155
AFS Fair Value, 12 months or longer | 984,175 | 411,283
AFS Unrealized Losses, 12 months or longer | 78,885 | 52,565
AFS Fair Value | 1,263,115 | 1,327,706
AFS Unrealized Losses | 86,005 | 121,720
Residential Mortgage Backed Securities [Member] |  |
AFS Fair Value, Less than 12 Months | 351,976 | 887,229
AFS Unrealized Losses, Less than 12 months | 4,765 | 76,432
AFS Fair Value, 12 months or longer | 757,914 | 108,041
AFS Unrealized Losses, 12 months or longer | 81,086 | 22,833
AFS Fair Value | 1,109,890 | 995,270
AFS Unrealized Losses | 85,851 | 99,265
Commercial Mortgage Backed Securities [Member] |  |
AFS Fair Value, Less than 12 Months | 130,189 | 512,953
AFS Unrealized Losses, Less than 12 months | 2,995 | 37,815
AFS Fair Value, 12 months or longer | 471,256 | 77,181
AFS Unrealized Losses, 12 months or longer | 42,135 | 11,945
AFS Fair Value | 601,445 | 590,134
AFS Unrealized Losses | 45,130 | 49,760
Available-for-sale Securities [Member] |  |
AFS Fair Value, Less than 12 Months | 1,240,809 | 5,060,440
AFS Unrealized Losses, Less than 12 months | 22,486 | 405,632
AFS Fair Value, 12 months or longer | 4,060,560 | 764,813
AFS Unrealized Losses, 12 months or longer | 380,878 | 131,556
AFS Fair Value | 5,301,369 | 5,825,253
AFS Unrealized Losses | $ 403,364 | $ 537,188

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