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) |