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Goodwill and Intangible Assets - Schedule of Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 158,743	$ 44,126
Finite-Lived Intangible Assets, Gross Carrying Amount	59,278	31,275
Finite-Lived Intangible Assets, Accumulated Amortization	(18,604)	(11,623)
Finite-Lived Intangible Assets, Net Carrying Amount	40,674	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	(16,266)	(11,335)
Finite-Lived Intangible Assets, Net Carrying Amount	27,312	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	(2,338)	(288)
Finite-Lived Intangible Assets, Net Carrying Amount	$ 13,362	$ 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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