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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 01, 2020
Dec. 31, 2019
Goodwill [Line Items]              
Goodwill $ 901,312 $ 901,166 $ 901,312   $ 898,569   $ 808,322
Purchase accounting adjustments 2,743 0          
Net intangible assets 77,363 $ 94,550 77,363 $ 81,364 85,500    
Remainder of fiscal year 15,900   15,900        
2022 14,000   14,000        
2023 12,300   12,300        
2024 11,100   11,100        
2025 $ 10,000   10,000        
Min              
Goodwill [Line Items]              
Weighted average useful life 6 years            
Max              
Goodwill [Line Items]              
Weighted average useful life 11 years            
Core Deposits              
Goodwill [Line Items]              
Net intangible assets $ 74,500   74,500   82,500    
Customer Relationships              
Goodwill [Line Items]              
Net intangible assets 2,900   2,900   $ 3,000    
Opus Bank              
Goodwill [Line Items]              
Goodwill           $ 92,990  
Purchase accounting adjustments $ 2,700   $ 146