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Basis of Presentation Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Jan. 01, 2020
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
ACL - loans | $ 256,727 | $ 277,567 |
Change in retained earnings | (1,258,499) | (1,120,781) |
Increase in ACL for certain OBS credit exposure | 4,300 | 5,300 |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
ACL - loans |  |  | $ 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 | 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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