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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill    
Total goodwill $ 30,201 $ 30,201
Banking    
Goodwill    
Total goodwill 20,131 20,131
Retirement and Benefit Services    
Goodwill    
Total goodwill $ 10,070 $ 10,070