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Goodwill and Core Deposit Intangibles - Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]      
Remaining 2019 $ 3,732    
2020 4,483    
2021 4,022    
2022 3,664    
2023 3,350    
Thereafter 12,313    
Total $ 31,564 $ 32,883 $ 38,842