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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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