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Goodwill and Intangible Assets - Schedule of Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Goodwill And Intangible Assets [Line Items] |  |
Goodwill | $ 158,728 | $ 44,126
Finite-Lived Intangible Assets, Gross Carrying Amount | 59,278 | 31,275
Finite-Lived Intangible Assets, Accumulated Amortization | (16,164) | (11,623)
Finite-Lived Intangible Assets, Net Carrying Amount | 43,114 | 19,652
Core Deposit Intangibles |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | 43,578 | 29,511
Finite-Lived Intangible Assets, Accumulated Amortization | (14,666) | (11,335)
Finite-Lived Intangible Assets, Net Carrying Amount | 28,912 | 18,176
Other Intangible Assets |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | 15,700 | 1,764
Finite-Lived Intangible Assets, Accumulated Amortization | (1,498) | (288)
Finite-Lived Intangible Assets, Net Carrying Amount | $ 14,202 | $ 1,476

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