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Investment Securities Available for Sale - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 USD ($) security | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |  |
Securities in a loss position for less than twelve months | security | 12 | 12 |  |
Investment securities in a loss position for twelve months or longer | security | 343 | 343 |  |
Proceeds from sales of investment securities available for sale | $ 1,300,000,000 | $ 1,301,520,000 | $ 0 | $ 565,400,000
Debt securities, available-for-sale, realized loss | 77,700,000 | 81,859,000 | 0 | 1,990,000
Payments to acquire investment securities available for sale | 1,280,000,000 | 2,150,430,000 | 2,287,318,000 | $ 6,877,712,000
Allowance for credit loss | 0 | 0 |  |
Collateral Pledged |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Pledged to secure deposits | $ 5,190,000,000 | $ 5,190,000,000 | $ 4,470,000,000 |

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