Premises and Equipment - Schedule of Premises and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	$ 61,479	$ 54,667
Less accumulated depreciation and amortization	10,305	7,600
Total premises and equipment, net	51,174	47,067
Buildings and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	35,765	30,716
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	10,399	8,940
Furniture, fixtures, and equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	13,773	11,536
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	$ 1,542	$ 3,475