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Basis of Presentation and Accounting Policies - Immaterial Correction of Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Proceeds from sales of investment securities available for sale | $ 223,977 | $ 2,529,722
Purchases of investment securities available for sale | (5,447,210) | (4,778,166)
Net cash used in investing activities | $ (3,101,133) | (3,223,538)
As Reported |  |
Proceeds from sales of investment securities available for sale |  | 3,932,368
Purchases of investment securities available for sale |  | (6,180,812)
Net cash used in investing activities |  | (3,223,538)
Adjustment |  |
Proceeds from sales of investment securities available for sale |  | (1,402,646)
Purchases of investment securities available for sale |  | 1,402,646
Net cash used in investing activities |  | $ 0

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