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v3.22.1

Investment Securities - Additional Information (Details) |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 01, 2022 USD ($) | Mar. 31, 2022 USD ($) security | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Summary of Investment Holdings [Line Items] |  |  |  |
Investment securities held to maturity |  | $ 2,082,242,000 |  | $ 0
Fair value of securities transferred to held-for-maturity | $ 2,039,000,000.000 |  |  |
Unrealized holding loss | $ 17,000,000 |  |  |
Transferred from available-for-sale to held-for-maturity |  | (22,200,000) |  |
Allowance for credit losses for available-for-sale debt securities |  | 0 |  | 0
Accrued interest receivable |  | 38,600,000 |  | 35,500,000
Allowance for securities held-to-maturity |  | $ 160,000 |  |
Number of securities in security portfolio | security |  | 3,272 |  |
Number of securities in unrealized loss position | security |  | 2,383 |  |
Total investment securities - available-for-sale |  | $ 8,750,604,000 |  | 7,382,066,000
Unrealized losses |  | 467,917,000 |  | 118,235,000
Equity securities, at fair value |  | 67,555,000 |  | 13,211,000
Gains (losses) on equity securities |  | (1,900,000) | $ 100,000 |
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 |  | 240,500,000 |  | 186,000,000
Other Assets | Partnership Interest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity securities without readily determinable fair value |  | 120,500,000 |  |
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity securities without readily determinable fair value |  | 120,000,000 |  |
Pooled trust preferred securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total investment securities - available-for-sale |  | 9,665,000 |  | 9,496,000
Unrealized losses |  | $ 4,097,000 |  | $ 4,260,000

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