EARNINGS PER SHARE (Numbers of Shares Used to Compute Basic and Diluted Earnings Per Share) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Basic
Net income available to common shareholders									$ 19,765	$ 18,145	$ 15,517
Weighted average common shares outstanding									7,513,103	7,462,528	7,432,693
Basic earnings per common share	$ 0.76	$ 0.72	$ 0.60	$ 0.55	$ 0.67	$ 0.56	$ 0.59	$ 0.61	$ 2.63	$ 2.43	$ 2.09
Diluted
Net income available to common shareholders									19,765	18,145	15,517
Weighted average common shares outstanding for basic earnings per common share									7,513,103	7,462,528	7,432,693
Add: Dilutive effects of assumed exercises of stock options and restricted stock units									33,949	11,972	4,741
Add: Dilutive effects of assumed exercise of stock warrant									$ 38,390	$ 69,800	$ 40,768
Average shares and dilutive potential common shares									7,585,442	7,544,300	7,478,202
Diluted earnings per common share	$ 0.76	$ 0.72	$ 0.59	$ 0.54	$ 0.66	$ 0.56	$ 0.59	$ 0.60	$ 2.61	$ 2.41	$ 2.07