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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following weighted-average assumptions were used to determine compensation expense related to stock options in 2012, 2011 and 2010:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Risk-free interest rate |  |  | 0.51 | % |  |  | 0.66 | % |  |  | 1.00 | %
Expected dividend yield |  |  | 2.89 | % |  |  | 2.65 | % |  |  | 2.56 | %
Expected term |  |  | 4.3 years |  |  |  | 4.3 years |  |  |  | 3.5 years |
Expected volatility |  |  | 26.4 | % |  |  | 29.6 | % |  |  | 33.0 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following tables summarize stock option activity under the Company’s plans: Stock Options
|  | Years ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Stock Options |  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 1,307,488 |  |  | $ | 21.76 |  |  |  | 1,269,426 |  |  | $ | 20.25 |  |  |  | 1,195,276 |  |  | $ | 18.68 |
Granted |  |  | 253,400 |  |  |  | 23.53 |  |  |  | 235,700 |  |  |  | 24.21 |  |  |  | 192,000 |  |  |  | 24.49 |
Exercised |  |  | (174,646 | ) |  |  | 13.17 |  |  |  | (122,463 | ) |  |  | 8.95 |  |  |  | (113,500 | ) |  |  | 10.59 |
Forfeited or expired |  |  | (120,450 | ) |  |  | 27.37 |  |  |  | (75,175 | ) |  |  | 24.93 |  |  |  | (4,350 | ) |  |  | 26.90 |
Outstanding at end of year |  |  | 1,265,792 |  |  | $ | 22.76 |  |  |  | 1,307,488 |  |  | $ | 21.76 |  |  |  | 1,269,426 |  |  | $ | 20.25 |
Exercisable at end of year |  |  | 706,863 |  |  | $ | 21.89 |  |  |  | 821,510 |  |  | $ | 20.16 |  |  |  | 848,200 |  |  | $ | 17.81 |
Weighted average fair market value of options granted |  | $ | 3.68 |  |  |  |  |  |  | $ | 4.51 |  |  |  |  |  |  | $ | 4.97 |  |  |  |  |
|  | Weighted Average Remaining Contractual Life (in Years) |  |  | Aggregate Intrinsic Value |
Outstanding - December 31, 2012 |  | 3.1 |  |  | $ | 2,022,000 |
Exercisable - December 31, 2012 |  | 1.8 |  |  | $ | 2,010,000 |
Schedule of Nonvested Share Activity [Table Text Block] | The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of the Company’s stock on December 31, 2012 of $23.36 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options. Non-vested Stock Options
Non-vested Stock Options |  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Fair Value |
Non-vested - December 31, 2009 |  |  | 349,325 |  |  | $ | 25.93 |  |  | $ | 5.00 |
Granted |  |  | 192,000 |  |  |  | 24.49 |  |  |  | 4.97 |
Vested |  |  | (116,999 | ) |  |  | 26.33 |  |  |  | 5.17 |
Forfeited |  |  | (3,100 | ) |  |  | 26.84 |  |  |  | 5.00 |
Non-vested - December 31, 2010 |  |  | 421,226 |  |  | $ | 25.16 |  |  | $ | 4.94 |
Granted |  |  | 235,700 |  |  |  | 24.21 |  |  |  | 4.51 |
Vested |  |  | (145,298 | ) |  |  | 25.86 |  |  |  | 5.05 |
Forfeited |  |  | (25,650 | ) |  |  | 25.62 |  |  |  | 4.91 |
Non-vested - December 31, 2011 |  |  | 485,978 |  |  | $ | 24.46 |  |  | $ | 4.70 |
Granted |  |  | 253,400 |  |  |  | 23.53 |  |  |  | 3.68 |
Vested |  |  | (173,824 | ) |  |  | 25.05 |  |  |  | 4.73 |
Forfeited |  |  | (6,625 | ) |  |  | 24.26 |  |  |  | 4.60 |
Non-vested - December 31, 2012 |  |  | 558,929 |  |  | $ | 23.86 |  |  | $ | 4.23 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes information about outstanding and exercisable stock options at December 31, 2012:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number of Options Outstanding |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Weighted Average Exercise Price |  |  | Number of Options Exercisable |  |  | Weighted Average Exercise Price |
$15.46 to $18.03 |  |  | 318,292 |  |  |  | 1.22 |  |  | $ | 17.15 |  |  |  | 318,292 |  |  | $ | 17.15 |
$23.09 to $23.53 |  |  | 423,400 |  |  |  | 4.31 |  |  |  | 23.35 |  |  |  | 127,949 |  |  |  | 23.09 |
$24.21 to $30.67 |  |  | 524,100 |  |  |  | 3.37 |  |  |  | 25.69 |  |  |  | 260,622 |  |  |  | 27.09 |
|  |  | 1,265,792 |  |  |  | 3.14 |  |  | $ | 22.76 |  |  |  | 706,863 |  |  | $ | 21.89 |
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block] | The following table summarizes stock option activity for the years ended December 31:
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (Dollars in thousands) |
Total intrinsic value of stock options exercised |  | $ | 1,704 |  |  | $ | 1,299 |  |  | $ | 1,443 |
Cash received from stock option exercises |  | $ | 2,300 |  |  | $ | 1,096 |  |  | $ | 1,202 |
Income tax benefit from the exercise of stock options |  | $ | 664 |  |  | $ | 507 |  |  | $ | 563 |
Total fair value of stock options vested |  | $ | 821 |  |  | $ | 733 |  |  | $ | 604 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes restricted stock award activity during the years ended December 31, 2010, 2011 and 2012:
Non-vested Restricted Stock |  | Shares of Restricted Stock |  |  | Weighted Average Grant Date Fair Value |
Non-vested - December 31, 2009 |  |  | 46,670 |  |  | $ | 25.56 |
Issued |  |  | 12,800 |  |  |  | 24.49 |
Vested |  |  | (22,372 | ) |  |  | 25.40 |
Forfeited |  |  | (1,650 | ) |  |  | 25.00 |
Non-vested - December 31, 2010 |  |  | 35,448 |  |  | $ | 24.79 |
Issued |  |  | 19,300 |  |  |  | 24.21 |
Vested |  |  | (16,748 | ) |  |  | 25.91 |
Forfeited |  |  | - |  |  |  | - |
Non-vested - December 31, 2011 |  |  | 38,000 |  |  |  | 24.47 |
Issued |  |  | 19,600 |  |  |  | 23.53 |
Vested |  |  | (15,025 | ) |  |  | 24.97 |
Forfeited |  |  | - |  |  |  | - |
Non-vested - December 31, 2012 |  |  | 42,575 |  |  | $ | 23.87 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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