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Stockholders' Equity (AOCI Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Realized gain on sale of securities | $ 0 | $ 48 | $ 0 | $ (188,847)
Other, net | 7,226 | 3,086 | 18,787 | (11,355)
Total AFS Securities | 124,293 | 78,991 | 260,091 | (746,785)
Derivative hedging instrument fair value changes, net | 0 | 0 | 0 | (50,127)
Amounts reclassified from AOCI | 0 | 7,116 | 0 | (660,594)
Amounts Reclassified from AOCI | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Realized gain on sale of securities | 0 | (60) | 0 | (389,127)
Other, net | 0 | 0 | 0 | (344,269)
Total AFS Securities | $ 0 | (60) | $ 0 | (733,396)
Amounts Reclassified from AOCI | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of de-designated hedging instruments |  | 7,176 |  | 72,802
Derivative hedging instrument fair value changes, net |  | $ 7,176 |  | $ 72,802

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