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Basis of Presentation Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in ACL | $ 280,259 | $ 291,940 | $ 257,471 |  | $ 166,209
Change in retained earnings | (1,168,491) | (1,120,781) |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in ACL |  | 0 |  |  | $ 58,349
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in ACL |  |  |  | $ 58,300 |
Change in retained earnings |  |  |  | 43,800 |
Increase in deferred tax assets |  |  |  | 12,400 |
Residential Mortgage |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in ACL for certain OBS credit exposure | $ 1,100 | $ 1,100 |  |  |
Residential Mortgage | Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in ACL for certain OBS credit exposure |  |  |  | (2,100) |
Residential Mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in ACL for certain OBS credit exposure |  |  |  | $ (2,100) |

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