Warrants - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Common Stock Warrant [Line Items]
Warrants exercised	37,500
Common stock warrants issued	162,500
Common stock warrant exercised	$ 10
Warrant expiration period	10 years
Warrants issued	87,509
Warrants issued price per share	$ 19.50
Number of warrants outstanding	125,000	87,059	87,059
Dryades Bancorp, Inc [Member]
Common Stock Warrant [Line Items]
Warrants exercised	9,633
Number of warrants outstanding	77,426