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Goodwill and Other Intangible Assets - Goodwill and Other Intangibles (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]      
Total $ 103,759 $ 111,110  
Core Deposit Premium      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 144,202 146,355  
Accumulated amortization (53,503) (48,992)  
Total 90,699 97,363 $ 111,808
Books of Business Intangible      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 19,937 19,937  
Accumulated amortization (6,877) (6,190)  
Total $ 13,060 $ 13,747 $ 15,532