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Goodwill and Other Intangible Assets - Summary of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | $ 84,282 | $ 56,928
Accumulated Amortization | (37,428) | (32,418)
Net Carrying Amount | 46,854 | 24,510
Core Deposit Intangibles |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 82,312 | 54,958
Accumulated Amortization | (36,497) | (31,586)
Net Carrying Amount | 45,815 | 23,372
Customer Relationship Intangible |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 1,970 | 1,970
Accumulated Amortization | (931) | (832)
Net Carrying Amount | $ 1,039 | $ 1,138

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