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Investment Securities - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) security | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) security | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Summary of Investment Holdings [Line Items] |  |  |  |  |
Investment securities held to maturity | $ 3,084,186,000 |  | $ 3,084,186,000 |  | $ 0
Fair value of securities transferred to held-for-maturity |  |  | 3,000,000,000 |  |
Unrealized loss |  |  | 125,200,000 |  |
Transferred from available-for-sale to held-for-maturity | 161,500,000 |  | 161,500,000 |  |
Allowance for credit losses for available-for-sale debt securities | 0 |  | 0 |  | 0
Allowance for securities held-to-maturity | 151,000 |  | 151,000 |  |
Accrued interest receivable | $ 50,900,000 |  | $ 50,900,000 |  | 35,500,000
Number of securities in security portfolio | security | 3,232 |  | 3,232 |  |
Number of securities in unrealized loss position | security | 2,679 |  | 2,679 |  |
Equity securities, at fair value | $ 55,879,000 |  | $ 55,879,000 |  | 13,211,000
Gains (losses) on equity securities | (2,400,000) | $ 200,000 | (4,200,000) | $ 700,000 |
Impairments on equity securities without readily determinable fair value |  |  | 0 | $ 0 |
Other Assets |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Equity securities without readily determinable fair value | 265,700,000 |  | 265,700,000 |  | $ 186,000,000
Other Assets | Partnership Interest |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Equity securities without readily determinable fair value | 143,000,000 |  | 143,000,000 |  |
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Equity securities without readily determinable fair value | $ 122,700,000 |  | $ 122,700,000 |  |

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