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Goodwill and Mortgage Servicing Rights (Goodwill by Business Segment) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 01, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 10,958,000 |  | $ 9,233,000
BBVA USA Bancshares, Inc. |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | $ 1,640,000 |
Retail Banking |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 6,493,000 |  | 5,795,000
Corporate & Institutional Banking |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 4,274,000 |  | 3,374,000
Asset Management Group |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 191,000 |  | $ 64,000

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