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Investment Securities - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |
Transfers and Servicing of Financial Assets |  |  |  |  | Securities Pledged and Received We pledged investment securities totaling $19.2 billion and $16.5 billion as of June 30, 2021 and December 31, 2020, respectively. These securities are primarily pledged to secure FHLB advances and Public Funds deposits, as well as for other purposes as required or permitted by law. We accepted pledges of securities with a fair value of approximately $1 million as of both June 30, 2021 and December 31, 2020, related to our derivative transactions. |
Security Owned and Pledged as Collateral, Fair Value | $ 19,200 | $ 16,500 | $ 19,200 |  | $ 19,200 |
Securities Received as Collateral | $ 1 | $ 1 | 1 |  | $ 1 |
Investments in Debt and Equity Instruments, Cash and Cash Equivalents, Unrealized and Realized Gains (Losses) |  |  |  |  | Net Securities Gains or Losses and Proceeds from Sales Total proceeds from sales of our securities were $595 million, with gains of $4 million for the six months ended June 30, 2021. We had no sales of securities both for the three months ended June 30, 2021 and 2020. For the six months ended June 30, 2020, total proceeds from the sale of our securities were $144 million and we recognized less than $1 million of gains. |
Proceeds from sales |  |  | $ 0 | $ 0 | $ 595 | $ 144
Debt Securities, Available-for-sale, Realized Gain |  |  |  |  | $ 4 | $ 1
Available-for-sale securities | Government Contracts Concentration Risk | US Treasury and Agency securities |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Percentage of portfolio | 96.00% | 96.00% |  |  |  |

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