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Goodwill and Other Intangibles and Mortgage Servicing Rights - Estimated future amortization expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Net book value $ 13,062 $ 14,769
Core deposit intangibles    
Finite-Lived Intangible Assets [Line Items]    
2020 (remaining three months) 733  
2021 2,643  
2022 2,150  
2023 1,633  
2024 1,130  
2025 670  
Thereafter 611  
Net book value 9,570 10,897
Customer list intangibles    
Finite-Lived Intangible Assets [Line Items]    
2020 (remaining three months) 127  
2021 507  
2022 507  
2023 483  
2024 449  
2025 449  
Thereafter 970  
Net book value 3,492 $ 3,872
MSR asset    
Finite-Lived Intangible Assets [Line Items]    
2020 (remaining three months) 434  
2021 1,568  
2022 1,535  
2023 1,419  
2024 1,202  
2025 784  
Thereafter 2,543  
Net book value $ 9,485