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Goodwill and Other Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill      
Gross Carrying Amount $ 47,139 $ 36,850  
Accumulated Amortization (21,220) (18,459)  
Total 25,919 18,391  
Intangible amortization expense 3,961 4,081 $ 4,638
Identifiable customer intangibles      
Goodwill      
Gross Carrying Amount 43,346 31,857  
Accumulated Amortization (17,490) (14,287)  
Total 25,856 17,570  
Core deposit intangible assets      
Goodwill      
Gross Carrying Amount 3,793 4,993  
Accumulated Amortization (3,730) (4,172)  
Total $ 63 $ 821