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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