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Goodwill and Other Intangible Assets - Finite-Lived Intangible Assets Roll Forward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Gross Balance of CDI:            
Balance, beginning of year $ 145,212   $ 145,212 $ 145,212 $ 125,945  
Additions due to acquisitions 0 $ 0 0 0 19,267  
Balance, end of year 145,212 145,212 145,212 145,212 145,212  
Accumulated amortization:            
Balance, beginning of year (67,849) (63,848) (50,662) (59,705) (42,633)  
Amortization (3,912) (4,001) (4,538) (12,056) (12,567)  
Balance, end of year (71,761) (67,849) (55,200) (71,761) (55,200)  
Net intangible assets $ 73,451 $ 77,363 $ 90,012 $ 73,451 $ 90,012 $ 85,500