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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Amortizable intangible assets:          
Intangible asset - net $ 14,041   $ 14,041   $ 19,936
Estimated amortization expense          
Amortization expense 1,321 $ 1,781 4,348 $ 5,192  
For the year ending December 31, 2021 5,509   5,509    
For the year ending December 31, 2022 4,277   4,277    
For the year ending December 31, 2023 3,270   3,270    
For the year ending December 31, 2024 2,452   2,452    
For the year ending December 31, 2025 1,662   1,662    
For the year ending December 31, 2026 871   871    
Core deposits          
Amortizable intangible assets:          
Intangible asset - gross 74,899   74,899   71,182
Acquisitions (disposals) 0   0   3,717
Less: accumulated amortization (60,974)   (60,974)   (56,896)
Intangible asset - net 13,925   13,925   18,003
Customer and contract          
Amortizable intangible assets:          
Intangible asset - gross 12,775   12,775   12,775
Acquisitions (disposals) (1,591)   (1,591)   0
Less: accumulated amortization (11,068)   (11,068)   (10,842)
Intangible asset - net $ 116   $ 116   $ 1,933