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Goodwill and intangible assets - Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
December 31, 2020 $ 4,262  
December 31, 2021 3,663  
December 31, 2022 2,972  
December 31, 2023 2,247  
December 31, 2024 1,737  
Thereafter 2,708  
Net Carrying Amount $ 17,589 $ 11,628