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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization expense related to the core deposit intangible assets $ 5,500 $ 6,900 $ 8,100
Estimated future amortization expense      
2019 4,518    
2020 3,634    
2021 2,749    
2022 1,865    
2023 1,199    
Thereafter 564    
Net carrying balance $ 14,529 $ 21,054