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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 14, 2019
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Goodwill, Impairment Loss       $ 0 $ 0 $ 0
Goodwill       $ 1,176,230 1,169,023  
Huntington National Bank            
Business Acquisition [Line Items]            
Goodwill $ 7,286          
Bank Mutual [Member]            
Business Acquisition [Line Items]            
Goodwill   $ 2,000 $ 6,000   175,000  
Diversified Insurance [Member]            
Business Acquisition [Line Items]            
Goodwill         10,000  
Anderson Insurance Investment Agency [Domain]            
Business Acquisition [Line Items]            
Goodwill         $ 7,000