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Purchased Loans - Narrative (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) loan | Mar. 31, 2021 USD ($) loan | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |  |
Acquisition, at fair value | $ 28,110,000 |  |  |
Outstanding balance of restructured loans | 10,146,991,000 |  | $ 9,856,743,000 |
Troubled debt restructured that has subsequently defaulted | 0 | $ 0 |  |
Allowance for loan losses attributable to restructured loans | $ 166,468,000 | $ 173,106,000 | $ 164,171,000 | $ 176,144,000
Purchased loans |  |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |  |
Number of restructured loans | loan | 0 | 0 |  |
Restructured loans discontinued past due period | 90 days | 90 days |  |
Remaining availability under commitments to lend additional funds on restructured loans | $ 0 | $ 153,000 |  |
Purchased loans | Restructured loans |  |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |  |
Outstanding balance of restructured loans | 9,944,000 | 19,140,000 |  |
Allowance for loan losses attributable to restructured loans | $ 69,000 | $ 167,000 |  |

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