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Investment Securities - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) security | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Accrued interest receivable | $ 39,069,000 |  | $ 38,528,000 |
Marketable securities at fair value | 3,213,000 |  | 3,367,000 |
Trade date receivable - securities | 0 |  | 0 |
Net (loss) gain on change in fair value and sale of equity securities | (154,000) | $ 76,000 |  |
Allowance for credit losses for investments | $ 0 |  | $ 0 |
Number of securities in securities portfolio | security | 514 |  | 511 |
Number of securities in securities portfolio, unrealized loss position | security | 321 |  | 80 |
Unrealized loss position | $ 1,434,900,000 |  | $ 1,030,914,000 |
Collateral Pledged |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Securities pledged | 1,253,407,000 |  | 1,226,646,000 |
Debt Securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Accrued interest receivable | 5,331,000 |  | 5,051,000 |
Increase (decrease) in debt securities, available for sale | (105,600,000) | (15,400,000) |  |
Unrealized loss position | $ 100,900,000 |  |  |
Unrealized gain position |  | $ 19,200,000 | $ 4,700,000 | $ 34,600,000

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