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Goodwill and Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Core Deposits [Member]      
Estimated future amortization expense      
Year ending December 31, 2021 $ 8,811    
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    
Beyond 2025 22,849    
Total Estimated Amortization Expense 66,904 $ 68,274 $ 52,774
Other Intangible Assets [Member]      
Estimated future amortization expense      
Year ending December 31, 2021 200    
Year ending December 31, 2022 200    
Year ending December 31, 2023 200    
Year ending December 31, 2024 200    
Year ending December 31, 2025 200    
Beyond 2025 350    
Total Estimated Amortization Expense 1,350 $ 20,027 $ 23,062
Servicing Contracts [Member]      
Estimated future amortization expense      
Year ending December 31, 2021 12,895    
Year ending December 31, 2022 14,372    
Year ending December 31, 2023 10,178    
Year ending December 31, 2024 7,502    
Year ending December 31, 2025 5,726    
Beyond 2025 9,295    
Total Estimated Amortization Expense $ 59,967