Goodwill and Other Intangible Assets, Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Goodwill and Other Intangible Assets Net [Line Items]
Recorded Goodwill	$ 32,868		$ 30,143
Aggregate amortization expense	$ 939	$ 367
Core Deposits
Goodwill and Other Intangible Assets Net [Line Items]
Weighted average amortization period	6 years
Core Deposits | Minimum
Goodwill and Other Intangible Assets Net [Line Items]
Finite lived intangible assets amortization period	4 years
Core Deposits | Maximum
Goodwill and Other Intangible Assets Net [Line Items]
Finite lived intangible assets amortization period	7 years