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Goodwill and Other Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Core Deposit Intangibles    
Estimated future amortization expense    
Three Months Ending December 31, 2021 $ 2,203  
Year ending December 31, 2022 8,811  
Year ending December 31, 2023 8,811  
Year ending December 31, 2024 8,811  
Year ending December 31, 2025 8,811  
Year ending December 31, 2026 8,811  
Beyond 2026 14,038  
Net book value 60,296 $ 66,904
Other Intangibles    
Estimated future amortization expense    
Net book value 0 $ 1,350
Mortgage Servicing Rights    
Estimated future amortization expense    
Three Months Ending December 31, 2021 2,945  
Year ending December 31, 2022 10,898  
Year ending December 31, 2023 8,500  
Year ending December 31, 2024 6,795  
Year ending December 31, 2025 5,499  
Year ending December 31, 2026 4,489  
Beyond 2026 16,978  
Net book value $ 56,104