Goodwill and Intangibles - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 139,784	$ 81,204
Core deposit intangible	18,950	14,370
Less: Accumulated amortization	(10,996)	(10,702)
Net core deposit intangible	$ 7,954	$ 3,668