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Debt Securities (Composition of Debt Securities Portfolio in Unrealized Loss Position by Credit Rating Agencies) (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 4,532,202 | $ 615,839
Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 4,250,933 |
Percentage of debt securities in unrealized loss position | 93.70% |
Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 188,297 |
Percentage of debt securities in unrealized loss position | 4.20% |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 92,972 |
Percentage of debt securities in unrealized loss position | 2.10% |
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 59,445 | 7,744
U.S. Treasury bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 59,445 |
Percentage of debt securities in unrealized loss position | 100.00% |
U.S. Treasury bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
U.S. Treasury bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 576,749 | 74,045
Municipal bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 563,613 |
Percentage of debt securities in unrealized loss position | 97.70% |
Municipal bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 13,136 |
Percentage of debt securities in unrealized loss position | 2.30% |
Municipal bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 154,950 | 67,094
Foreign government bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 153,987 |
Percentage of debt securities in unrealized loss position | 99.40% |
Foreign government bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Foreign government bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 963 |
Percentage of debt securities in unrealized loss position | 0.60% |
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 75,547 | 15,353
Governmental agency bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 75,547 |
Percentage of debt securities in unrealized loss position | 100.00% |
Governmental agency bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Governmental agency bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 3,070,159 | 388,420
Governmental agency mortgage-backed securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 3,070,159 |
Percentage of debt securities in unrealized loss position | 100.00% |
Governmental agency mortgage-backed securities | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Governmental agency mortgage-backed securities | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 432,702 | 43,865
U.S. corporate debt securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 233,772 |
Percentage of debt securities in unrealized loss position | 54.00% |
U.S. corporate debt securities | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 127,998 |
Percentage of debt securities in unrealized loss position | 29.60% |
U.S. corporate debt securities | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 70,932 |
Percentage of debt securities in unrealized loss position | 16.40% |
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 162,650 | $ 19,318
Foreign corporate debt securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 94,410 |
Percentage of debt securities in unrealized loss position | 58.00% |
Foreign corporate debt securities | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 47,163 |
Percentage of debt securities in unrealized loss position | 29.00% |
Foreign corporate debt securities | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 21,077 |
Percentage of debt securities in unrealized loss position | 13.00% |

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