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Goodwill and Other Intangible Assets (Amortization Expense of Core Deposit Intangibles) (Details) - Core Deposit Intangibles - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 1,200 $ 1,500  
Year Ended December 31,      
Remainder of 2019 3,344    
2020 3,634    
2021 2,749    
2022 1,865    
2023 1,199    
Thereafter 564    
Net carrying balance $ 13,355   $ 14,529