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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill acquired $ 90,300    
Goodwill 207,632   $ 117,345
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 838 $ 656  
Core deposit      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 800 $ 700  
Finite-lived intangible assets useful life 10 years