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Goodwill and intangible assets - Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 1,159  
December 31, 2020 4,262  
December 31, 2021 3,663  
December 31, 2022 2,973  
December 31, 2023 2,247  
Thereafter 4,444  
Net Carrying Amount $ 18,748 $ 11,628