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Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,009,064 |
Estimated Fair Value | 3,097,375 | $ 3,062,143
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 354,593 | 348,391
Estimated Fair Value | $ 371,381 | $ 367,145

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