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Goodwill and Other Intangible Assets (Amortization Expense of Core Deposit Intangibles) (Details) - Core Deposit Intangibles - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization expense related to the core deposit intangible assets $ 3,600 $ 4,500 $ 5,500
Estimated future amortization expense      
2021 2,749    
2022 1,865    
2023 1,199    
2024 553    
2025 11    
Thereafter 0    
Net carrying balance $ 6,377 $ 10,011