Earnings Per Share - Calculation of Percentage of Net Income Allocable to Common Shareholders (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Basic weighted average common shares	18,373,033	18,166,261	18,249,583
Add: Other common shares eligible for common dividends:
Weighted average restricted shares and stock options (including tax benefit component)	375,776	408,930	443,128
Diluted weighted average common shares	18,748,809	18,575,191	18,692,711