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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2013
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 2013, 2012 and 2011:
|  | 2013 |  | 2012 |  | 2011
Risk-free interest rate |  |  | 1.10% |  |  |  | 0.51 | % |  |  | 0.66 | %
Expected dividend yield |  |  | 2.53% |  |  |  | 2.89 | % |  |  | 2.65 | %
Expected term |  |  | 4.3 years |  |  |  | 4.3 years |  |  |  | 4.3 years |
Expected volatility |  |  | 16.2% |  |  |  | 26.4 | % |  |  | 29.6 | %
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,
|  | 2013 |  | 2012 |  | 2011
Stock Options |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
Outstanding at beginning of year |  |  | 1,265,792 |  |  | $ | 22.76 |  |  |  | 1,307,488 |  |  | $ | 21.76 |  |  |  | 1,269,426 |  |  | $ | 20.25 |
Granted |  |  | 333,300 |  |  |  | 28.50 |  |  |  | 253,400 |  |  |  | 23.53 |  |  |  | 235,700 |  |  |  | 24.21 |
Exercised |  |  | (219,526) |  |  |  | 17.91 |  |  |  | (174,646 | ) |  |  | 13.17 |  |  |  | (122,463 | ) |  |  | 8.95 |
Forfeited or expired |  |  | (118,700) |  |  |  | 30.30 |  |  |  | (120,450 | ) |  |  | 27.37 |  |  |  | (75,175 | ) |  |  | 24.93 |
Outstanding at end of year |  |  | 1,260,866 |  |  | $ | 24.41 |  |  |  | 1,265,792 |  |  | $ | 22.76 |  |  |  | 1,307,488 |  |  | $ | 21.76 |
Exercisable at end of year |  |  | 581,081 |  |  | $ | 22.39 |  |  |  | 706,863 |  |  | $ | 21.89 |  |  |  | 821,510 |  |  | $ | 20.16 |
Weighted average fair market value of options granted |  | $ | 2.77 |  |  |  |  |  |  | $ | 3.68 |  |  |  |  |  |  | $ | 4.51 |  |  |  |  |
|  | Weighted Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value
Outstanding – December 31, 2013 |  |  | 3.7 |  |  | $ | 6,330,000 |
Exercisable – December 31, 2013 |  |  | 2.2 |  |  | $ | 4,092,000 |
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, 2013 of $29.43 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, 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 |
Granted |  |  | 333,300 |  |  |  | 28.50 |  |  |  | 2.77 |
Vested |  |  | (207,044 | ) |  |  | 23.83 |  |  |  | 4.42 |
Forfeited |  |  | (5,400 | ) |  |  | 23.95 |  |  |  | 4.28 |
Non-vested – December 31, 2013 |  |  | 679,785 |  |  | $ | 26.14 |  |  | $ | 3.46 |
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, 2013:
|  | 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 |  |  | 135,966 |  |  |  | 1.20 |  |  | $ | 17.71 |  |  |  | 135,966 |  |  | $ | 17.71 |
$23.09 to $23.53 |  |  | 400,775 |  |  |  | 3.41 |  |  |  | 23.36 |  |  |  | 212,068 |  |  |  | 23.22 |
$24.21 to $28.50 |  |  | 724,125 |  |  |  | 4.37 |  |  |  | 26.25 |  |  |  | 233,047 |  |  |  | 24.36 |
|  |  | 1,260,866 |  |  |  | 3.72 |  |  | $ | 24.41 |  |  |  | 581,081 |  |  | $ | 22.39 |
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:
|  | 2013 |  | 2012 |  | 2011
|  | (Dollars in thousands)
Total intrinsic value of stock options exercised |  | $ | 1,506 |  |  | $ | 1,704 |  |  | $ | 1,299 |
Cash received from stock option exercises |  | $ | 3,932 |  |  | $ | 2,300 |  |  | $ | 1,096 |
Income tax benefit from the exercise of stock options |  | $ | 588 |  |  | $ | 664 |  |  | $ | 507 |
Total fair value of stock options vested |  | $ | 915 |  |  | $ | 821 |  |  | $ | 733 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes restricted stock award activity during the years ended December 31, 2011, 2012 and 2013:
Non-vested Restricted Stock |  | Shares of Restricted Stock |  | Weighted Average Grant Date Fair Value
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 |
Issued |  |  | 20,400 |  |  |  | 28.50 |
Vested |  |  | (15,475 | ) |  |  | 23.85 |
Forfeited |  |  | — |  |  |  | — |
Non-vested – December 31, 2013 |  |  | 47,500 |  |  | $ | 25.86 |

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