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Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Apr. 01, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]          
Goodwill $ 545,385   $ 543,918 $ 543,918 $ 543,918
Hoosier          
Business Acquisition [Line Items]          
Cash and cash equivalents   $ 292      
Other assets   35      
Other liabilities   (816)      
Net tangible assets acquired   (489)      
Customer relationship intangible   2,247      
Goodwill   1,467      
Purchase price   $ 3,225