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Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 69,900 $ 69,900
Accumulated Amortization (31,925) (24,788)
Net Carrying Value 37,975 45,112
CDI    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 57,400 57,400
Accumulated Amortization (26,091) (19,829)
Net Carrying Value 31,309 37,571
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 12,500 12,500
Accumulated Amortization (5,834) (4,959)
Net Carrying Value $ 6,666 $ 7,541