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Goodwill and Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Core Deposit Intangibles      
Estimated future amortization expense      
Year ending December 31, 2019 $ 5,810    
Year ending December 31, 2020 5,810    
Year ending December 31, 2021 5,810    
Year ending December 31, 2022 5,810    
Year ending December 31, 2023 5,810    
Beyond 2023 23,724    
Net book value 52,774 $ 0 $ 112
Other Intangibles      
Estimated future amortization expense      
Year ending December 31, 2019 2,824    
Year ending December 31, 2020 2,707    
Year ending December 31, 2021 2,682    
Year ending December 31, 2022 2,659    
Year ending December 31, 2023 2,640    
Beyond 2023 9,551    
Net book value 23,062 $ 15,580 $ 15,265
Mortgage Servicing Rights      
Estimated future amortization expense      
Year ending December 31, 2019 9,666    
Year ending December 31, 2020 10,355    
Year ending December 31, 2021 8,951    
Year ending December 31, 2022 7,694    
Year ending December 31, 2023 6,580    
Beyond 2023 25,187    
Net book value $ 68,433