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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2014
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 2014, 2013 and 2012:
|  | 2014 |  | 2013 |  | 2012
Risk-free interest rate |  |  | 1.45 | % |  |  | 1.10 | % |  |  | 0.51 | %
Expected dividend yield |  |  | 2.81 | % |  |  | 2.53 | % |  |  | 2.89 | %
Expected term |  |  | 4.3 years |  |  |  | 4.3 years |  |  |  | 4.3 years |
Expected volatility |  |  | 17.8 | % |  |  | 16.2 | % |  |  | 26.4 | %
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,
|  | 2014 |  | 2013 |  | 2012
Stock Options |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
Outstanding at beginning of year |  |  | 1,260,866 |  |  | $ | 24.41 |  |  |  | 1,265,792 |  |  | $ | 22.76 |  |  |  | 1,307,488 |  |  | $ | 21.76 |
Granted |  |  | 331,600 |  |  |  | 27.04 |  |  |  | 333,300 |  |  |  | 28.50 |  |  |  | 253,400 |  |  |  | 23.53 |
Exercised |  |  | (218,150 | ) |  |  | 22.37 |  |  |  | (219,526 | ) |  |  | 17.91 |  |  |  | (174,646 | ) |  |  | 13.17 |
Forfeited or expired |  |  | (18,900 | ) |  |  | 25.71 |  |  |  | (118,700 | ) |  |  | 30.30 |  |  |  | (120,450 | ) |  |  | 27.37 |
Outstanding at end of year |  |  | 1,355,416 |  |  | $ | 25.36 |  |  |  | 1,260,866 |  |  | $ | 24.41 |  |  |  | 1,265,792 |  |  | $ | 22.76 |
Exercisable at end of year |  |  | 603,834 |  |  | $ | 23.66 |  |  |  | 581,081 |  |  | $ | 22.39 |  |  |  | 706,863 |  |  | $ | 21.89 |
Weighted average fair market value of options granted |  | $ | 2.93 |  |  |  |  |  |  | $ | 2.77 |  |  |  |  |  |  | $ | 3.68 |  |  |  |  |
|  | Weighted Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value
Outstanding – December 31, 2014 |  |  | 3.8 |  |  | $ | 5,839,000 |
Exercisable – December 31, 2014 |  |  | 2.4 |  |  | $ | 3,631,000 |
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, 2014 of $29.67 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, 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 |
Granted |  |  | 331,600 |  |  |  | 27.04 |  |  |  | 2.93 |
Vested |  |  | (243,303 | ) |  |  | 25.54 |  |  |  | 3.80 |
Forfeited |  |  | (16,500 | ) |  |  | 25.98 |  |  |  | 3.44 |
Non-vested – December 31, 2014 |  |  | 751,582 |  |  | $ | 26.74 |  |  | $ | 3.12 |
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, 2014:
|  | 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
$18.03 |  |  | 105,166 |  |  |  | 0.32 |  |  | $ | 18.03 |  |  |  | 105,166 |  |  | $ | 18.03 |
$23.53 to $24.49 |  |  | 594,250 |  |  |  | 2.82 |  |  |  | 24.01 |  |  |  | 416,518 |  |  |  | 24.12 |
$27.04 to $28.50 |  |  | 656,000 |  |  |  | 5.29 |  |  |  | 27.76 |  |  |  | 82,150 |  |  |  | 28.50 |
|  |  | 1,355,416 |  |  |  | 3.82 |  |  | $ | 25.36 |  |  |  | 603,834 |  |  | $ | 23.66 |
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:
|  | 2014 |  | 2013 |  | 2012
|  | (Dollars in thousands)
Total intrinsic value of stock options exercised |  | $ | 1,108 |  |  | $ | 1,506 |  |  | $ | 1,704 |
Cash received from stock option exercises |  | $ | 4,881 |  |  | $ | 3,932 |  |  | $ | 2,300 |
Income tax benefit from the exercise of stock options |  | $ | 432 |  |  | $ | 588 |  |  | $ | 664 |
Total fair value of stock options vested |  | $ | 923 |  |  | $ | 915 |  |  | $ | 821 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | ## The following table summarizes restricted stock award activity during the years ended December 31, 2012, 2013 and 2014:
Non-vested Restricted Stock |  | Shares of Restricted Stock |  | Weighted Average Grant Date Fair Value
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 |
Issued |  |  | 24,400 |  |  |  | 27.04 |
Vested |  |  | (17,850 | ) |  |  | 25.31 |
Forfeited |  |  | — |  |  |  | — |
Non-vested – December 31, 2014 |  |  | 54,050 |  |  | $ | 26.58 |

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