STOCK-BASED COMPENSATION (Details) (USD $)	12 Months Ended												1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2010 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 2006 Compensation plan [Member]	Dec. 31, 2000 2006 Compensation plan [Member]	Dec. 31, 2012 2006 Compensation plan [Member] Restricted Stock Units (RSUs) [Member]	Jan. 31, 2005 1996 Options and Appreciation Rights Plan [Member]	Dec. 31, 2012 1996 Options and Appreciation Rights Plan [Member]	Dec. 31, 2000 1996 Options and Appreciation Rights Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Numbers of share-based compensation plans	2
Shares authorized (in shares)										600,000				1,080,000
Shares available for grant (in shares)										143,730		27,576
Maximum shares award to one person in one fiscal year (in shares)										70,000				50,000
Exercise price of stock options and stock appreciation rights, minimum (in hundredths)										100.00%
Vesting period				5 years			3 years			5 years				3 years
Term for stock options granted										10 years			10 years	10 years	10 years
Period from the date of grant that options became exercisable											6 months		90 days
Fair Value of Stock Option Awards assumptions [Abstract]
Grant date fair value (in dollars per share)					$ 10.30	$ 9.13
Expected volatility (in hundredths)					45.83%	47.68%
Expected dividends (in hundredths)					3.03%	3.19%
Expected term (in years)					7 years 1 month 28 days	6 years 9 months 25 days
Risk-free interest rate (in hundredths)					1.93%	2.34%
Period of recognition of compensation expense				5 years			3 years
Compensation expense for share based awards	$ 782,000	$ 756,000	$ 647,000
Share based compensation, tax benefit	311,000	300,000	257,000
Number of Options [Roll Forward]
Outstanding at beginning of period (in shares)	449,504
Exercised (in shares)	(129,285)
Forfeited or expired (in shares)	(16,158)
Outstanding at end of period (in shares)	304,061	449,504
Exercisable at end of period (in shares)	199,901
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)	$ 22.31
Exercised (in dollars per share)	$ 20.14
Forfeited or expired (in dollars per share)	$ 21.20
Outstanding at end of period (in dollars per share)	$ 23.29	$ 22.31
Exercisable, at end of period (in dollars per share)	$ 22.31
Weighted Average Remaining Contractual Term/ Aggregate Intrinsic Value [Abstract]
Weighted Average Remaining Contractual Term, Outstanding at end of period	4 years 11 months 26 days
Weighted Average Remaining Contractual Term, Exercisable at end of period	3 years 11 months 12 days
Aggregate Intrinsic Value, Outstanding at end of period	1,563,000
Aggregate Intrinsic Value Exercisable at end of period	1,209,000
Total intrinsic value of options exercised during the period	1,017,000	727,000	477,000
Restricted Stock Units [Roll Forward]
Nonvested at beginning of period (in shares)							30,023
Granted (in shares)							29,824
Vested (in shares)							(10,968)
Forfeited (in shares)							(3,435)
Nonvested at end of period (in shares)							45,444	30,023
Weighted-Average Grant-Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)							$ 24.62
Granted (in dollars per share)							$ 24.23
Vested (in dollars per share)							$ 22.69
Forfeited (in dollars per share)							$ 22.69
Nonvested, ending of period (in dollars per share)							$ 24.98	$ 24.62
Fair value of RSUs vested							311,000	430,000	558,000
Unrecognized Compensation Cost [Abstract]
Unrecognized compensation cost related to nonvested equity awards.	1,100,000
Weighted average period for recognition	2 years 2 months 12 days
Cash Received and Tax Benefits Realized [Abstract]
Cash received from option exercises	2,603,000	1,279,000	676,000
Actual tax benefit realized for the tax deductions from option exercises	$ 261,000	$ 148,000	$ 11,000