Goodwill and Other Intangible Assets - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Gross Carrying Value, Core deposit intangibles	$ 11,508	$ 11,508
Accumulated Amortization, Core deposit intangibles	(9,789)	(8,825)
Net Carrying Value, Core deposit intangibles	1,719	2,683
Gross Carrying Value, Goodwill	43,872	43,872
Accumulated Amortization, Goodwill	0	0
Net Carrying Value, Goodwill	$ 43,872	$ 43,872	$ 39,043