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Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Allowance for credit losses on loans and leases |  | $ 1,227,362 | $ 1,179,021 | $ 1,165,335 | $ 1,361,723
Liability for unfunded commitments | $ 115,758 | 32,707 | 19,367 | $ 72,713 | $ 110,044
Deferred tax asset | $ 306,171 |  |  |  |
Dividends |  | $ 108,000 | $ 1,000,000 |  |
Accounting Standards Update 2016-13 |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Period of deferment | 2 years |  |  |  |
Amount deferred | 25.00% |  |  |  |
Allowance for credit losses on loans and leases | $ 1,100,000 |  |  |  |
Liability for unfunded commitments | 116,000 |  |  |  |
Deferred tax asset | 306,000 |  |  |  |
Reduction to retained earnings | $ 953,000 |  |  |  |

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