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Goodwill and Intangible Assets - Schedule of Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
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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Goodwill and intangible assets.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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