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Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Debt securities, Gross Realized Gains | $ 465 | $ 6,334 | $ 34,481 | $ 6,451
Debt securities, Gross Realized Losses | (429) | (3,329) | (970) | (3,400)
Debt securities, Net Gains (Losses) | $ 36 | $ 3,005 | $ 33,511 | $ 3,051

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