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Debt Securities (Investments in Debt Securities by Contractual Maturity) (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, amortized cost | $ 9,000,753 | $ 6,121,004
Debt securities, Estimated fair value | 9,095,806 | 6,354,822
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 46,695 |
Amortized cost, Due after one through five years | 78,036 |
Amortized cost, Due after five through ten years | 25,518 |
Amortized cost, Due after ten years | 22,006 |
Debt securities, amortized cost | 172,255 | 80,172
Estimated fair value, Due in one year or less | 46,776 |
Estimated fair value, Due after one through five years | 77,850 |
Estimated fair value, Due after five through ten years | 25,673 |
Estimated fair value, Due after ten years | 21,444 |
Debt securities, Estimated fair value | 171,743 | 80,846
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 26,737 |
Amortized cost, Due after one through five years | 97,493 |
Amortized cost, Due after five through ten years | 751,040 |
Amortized cost, Due after ten years | 688,832 |
Debt securities, amortized cost | 1,564,102 | 1,168,425
Estimated fair value, Due in one year or less | 26,884 |
Estimated fair value, Due after one through five years | 102,020 |
Estimated fair value, Due after five through ten years | 771,806 |
Estimated fair value, Due after ten years | 713,091 |
Debt securities, Estimated fair value | 1,613,801 | 1,248,808
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 52,799 |
Amortized cost, Due after one through five years | 93,254 |
Amortized cost, Due after five through ten years | 76,214 |
Amortized cost, Due after ten years | 10,228 |
Debt securities, amortized cost | 232,495 | 194,042
Estimated fair value, Due in one year or less | 52,826 |
Estimated fair value, Due after one through five years | 94,105 |
Estimated fair value, Due after five through ten years | 74,215 |
Estimated fair value, Due after ten years | 10,229 |
Debt securities, Estimated fair value | 231,375 | 199,530
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 19,375 |
Amortized cost, Due after one through five years | 80,313 |
Amortized cost, Due after five through ten years | 37,500 |
Amortized cost, Due after ten years | 70,906 |
Debt securities, amortized cost | 208,094 | 254,248
Estimated fair value, Due in one year or less | 19,596 |
Estimated fair value, Due after one through five years | 81,677 |
Estimated fair value, Due after five through ten years | 37,644 |
Estimated fair value, Due after ten years | 72,590 |
Debt securities, Estimated fair value | 211,507 | 263,922
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 36,886 |
Amortized cost, Due after one through five years | 479,958 |
Amortized cost, Due after five through ten years | 414,830 |
Amortized cost, Due after ten years | 70,775 |
Debt securities, amortized cost | 1,002,449 | 637,808
Estimated fair value, Due in one year or less | 37,292 |
Estimated fair value, Due after one through five years | 492,943 |
Estimated fair value, Due after five through ten years | 417,154 |
Estimated fair value, Due after ten years | 75,000 |
Debt securities, Estimated fair value | 1,022,389 | 680,697
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 20,621 |
Amortized cost, Due after one through five years | 266,364 |
Amortized cost, Due after five through ten years | 134,173 |
Amortized cost, Due after ten years | 40,025 |
Debt securities, amortized cost | 461,183 | 384,572
Estimated fair value, Due in one year or less | 20,876 |
Estimated fair value, Due after one through five years | 272,278 |
Estimated fair value, Due after five through ten years | 136,133 |
Estimated fair value, Due after ten years | 42,546 |
Debt securities, Estimated fair value | 471,833 | $ 406,401
Debt Securities Excluding Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 203,113 |
Amortized cost, Due after one through five years | 1,095,418 |
Amortized cost, Due after five through ten years | 1,439,275 |
Amortized cost, Due after ten years | 902,772 |
Debt securities, amortized cost | 3,640,578 |
Estimated fair value, Due in one year or less | 204,250 |
Estimated fair value, Due after one through five years | 1,120,873 |
Estimated fair value, Due after five through ten years | 1,462,625 |
Estimated fair value, Due after ten years | 934,900 |
Debt securities, Estimated fair value | 3,722,648 |
Total Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 5,360,175 |
Estimated fair value | $ 5,373,158 |

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