Recently Issued and/or Adopted Accounting Standards (Details) - USD ($) $ in Thousands |
Sep. 30, 2021 |
Jun. 30, 2021 |
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Jan. 01, 2020 |
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| Basis of Presentation and Significant Accounting Policies [Abstract] | ||||||
| Available-for-sale securities, amortized cost | $ 6,369,038 | $ 14,043,175 | $ 30,700,000 | |||
| Available-for-sale securities, allowance for credit losses | $ 15,429 | $ 17,765 | $ 22,528 | $ 25,495 | $ 42,583 | $ 244,876 |
| X | ||||||||||
- Definition Basis of Presentation and Significant Accounting Policies [Abstract] No definition available.
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| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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