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Acquisitions (Details) $ in Thousands | Sep. 17, 2021 USD ($) county business | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | ---
Asset Acquisition [Line Items] |  |  |  |
Acquisition of goodwill |  | $ 162,788 | $ 151,238 | $ 151,238
TCF National Bank |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Number of businesses acquired | business | 14 |  |  |
Number of businesses acquired in country | county | 11 |  |  |
Cash acquired | $ 618,167 |  |  |
Loans | 206,300 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 6,901 |  |  |
Cash | $ 4,012 |  |  |
Premium percentage on deposits | 1.75% |  |  |
Customer deposits | $ 846,400 |  |  |
Acquisition of goodwill | 11,550 |  |  |
Core Deposit Intangible | TCF National Bank |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Core deposit intangible | $ 887 |  |  |
Core deposit intangible amortization period | 10 years |  |  |

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