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Goodwill and Other Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and other intangibles assets      
Intangible assets, gross $ 114,864 $ 114,464  
Accumulated amortization 62,879 52,871  
Total estimated amortization expense 51,985 61,593  
Amortization expense 10,008 9,547 $ 5,854
Estimated amortization expense:      
2021 9,319    
2022 8,546    
2023 7,695    
2024 6,827    
2025 5,794    
Thereafter 13,804    
Total estimated amortization expense 51,985 61,593  
Core deposit intangible assets      
Goodwill and other intangibles assets      
Intangible assets, gross 90,256 90,256  
Accumulated amortization 46,909 39,156  
Total estimated amortization expense 43,347 51,100  
Amortization expense 7,753 7,963  
Estimated amortization expense:      
2021 7,259    
2022 6,749    
2023 6,226    
2024 5,686    
2025 4,915    
Thereafter 12,512    
Total estimated amortization expense 43,347 51,100  
Customer relationship intangible assets      
Goodwill and other intangibles assets      
Intangible assets, gross 24,608 24,208  
Accumulated amortization 15,970 13,715  
Total estimated amortization expense 8,638 10,493  
Amortization expense 2,255 1,584  
Estimated amortization expense:      
2021 2,060    
2022 1,797    
2023 1,469    
2024 1,141    
2025 879    
Thereafter 1,292    
Total estimated amortization expense $ 8,638 $ 10,493