Stock Options and Restricted Stock - Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]
Shares outstanding, Beginning balance	832,548	919,348	1,270,698
Shares, Granted
Shares, Exercised	(256,300)	(86,800)	(338,350)
Shares Cancelled, forfeited, or expired			(13,000)
Shares outstanding, Ending balance	576,248	832,548	919,348	1,270,698
Shares exercisable, Ending balance	557,448	779,948	832,948
Weighted- Average Exercise Price, Beginning balance	$ 10.51	$ 10.37	$ 10.28
Weighted- Average Exercise Price, Granted
Weighted- Average Exercise Price, Exercised	$ 9.00	$ 9.00	$ 9.87
Weighted- Average Exercise Price, Cancelled, forfeited, or expired
Weighted- Average Exercise Price, Ending balance	$ 11.12	$ 10.51	$ 10.37	$ 10.28
Weighted- Average Exercise Price, Exercisable Ending balance	$ 10.91	$ 10.08	$ 9.70
Weighted- Average Remaining Contractual Life (in years)	3 years 9 months 18 days	4 years 7 months 6 days	5 years 6 months	6 years 4 months 24 days
Weighted- Average Remaining Contractual Life (in years), Exercisable	3 years 8 months 12 days	4 years 4 months 24 days	5 years 2 months 12 days
Weighted- Average Remaining Contractual Life (in years)	3 years 9 months 18 days	4 years 7 months 6 days	5 years 6 months	6 years 4 months 24 days