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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Feb. 14, 2020
Jun. 14, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Goodwill, Impairment Loss       $ 0 $ 0 $ 0
Goodwill       1,109,300 1,176,230  
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Business Acquisition [Line Items]            
Reductions due to sale       (17,435) $ (217) $ (43)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Intangible Assets [Member] | ABRC [Member]            
Business Acquisition [Line Items]            
Reductions due to sale $ 17,000          
Huntington National Bank            
Business Acquisition [Line Items]            
Goodwill     $ 7,000      
First Staunton Bancshares            
Business Acquisition [Line Items]            
Goodwill $ 82,000 $ 14,812   $ 15,000