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Acquisition and Divestiture Activity ( Unaudited Pro Forma Results) (Details) - BBVA USA Bancshares, Inc. - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Business Acquisition [Line Items] |  |  |  |
Net interest income | $ 2,984,000 | $ 3,126,000 | $ 5,975,000 | $ 6,250,000
Noninterest income | 2,258,000 | 1,757,000 | 4,354,000 | 3,825,000
Net income | $ 2,097,000 | $ 3,327,000 | $ 4,226,000 | $ 851,000

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