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Acquisitions - Additional Information (Details)
$ in Thousands
9 Months Ended
Sep. 17, 2021
USD ($)
business
county
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Asset Acquisition [Line Items]        
Cash acquired   $ 0 $ 616,832  
Goodwill   155,211   $ 154,572
Goodwill purchase adjustment   $ 639    
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 212,000      
Fixed assets 6,901      
Cash and due from banks $ 4,012      
Premium percentage on deposits 1.75%      
Customer deposits $ 846,400      
Goodwill 3,973      
Goodwill purchase adjustment 639      
TCF National Bank | Core Deposit Intangible        
Asset Acquisition [Line Items]        
Core deposit intangible $ 1,600      
Core deposit intangible amortization period 10 years