Premises and Equipment, Net - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 136,207	$ 120,825
Accumulated depreciation	(49,144)	(39,552)
Premises and equipment, net	87,063	81,273
Land and Land Improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	12,574	12,574
Buildings and Leasehold Improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	60,919	56,446
Furniture, Fixtures and Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	15,026	12,275
Software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 47,688	$ 39,530