Derivative Financial Instruments - Schedule of Fair Value Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivatives designated as hedging instruments	$ 646	$ 2,179
Derivatives not designated as hedging instruments	618	1,045
Total asset derivatives	1,264	3,224
Derivatives designated as hedging instruments	45	149
Derivatives not designated as hedging instruments	618	1,045
Total liability derivatives	663	1,194
Interest Rate Contracts [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives designated as hedging instruments	646	2,179
Derivatives not designated as hedging instruments	618	1,045
Interest Rate Contracts [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives designated as hedging instruments	45	149
Derivatives not designated as hedging instruments	$ 618	$ 1,045