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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2016
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 2016, 2015 and 2014:
|  | 2016 |  | 2015 |  | 2014
Risk-free interest rate |  |  | 1.09 | % |  |  | 1.36 | % |  |  | 1.45 | %
Expected dividend yield |  |  | 3.29 | % |  |  | 3.12 | % |  |  | 2.81 | %
Expected term |  |  | 4.3 years |  |  |  | 4.3 years |  |  |  | 4.3 years |
Expected volatility |  |  | 21.3 | % |  |  | 21.6 | % |  |  | 17.8 | %
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,
|  | 2016 |  | 2015 |  | 2014
Stock Options |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
Outstanding at beginning of year |  |  | 1,351,826 |  |  | $ | 26.09 |  |  |  | 1,355,416 |  |  | $ | 25.36 |  |  |  | 1,260,866 |  |  | $ | 24.41 |
Granted |  |  | 277,800 |  |  |  | 25.51 |  |  |  | 299,700 |  |  |  | 25.64 |  |  |  | 331,600 |  |  |  | 27.04 |
Exercised |  |  | (123,294 | ) |  |  | 24.28 |  |  |  | (279,090 | ) |  |  | 22.02 |  |  |  | (218,150 | ) |  |  | 22.37 |
Forfeited or expired |  |  | (20,075 | ) |  |  | 26.52 |  |  |  | (24,200 | ) |  |  | 26.58 |  |  |  | (18,900 | ) |  |  | 25.71 |
Outstanding at end of year |  |  | 1,486,257 |  |  | $ | 26.13 |  |  |  | 1,351,826 |  |  | $ | 26.09 |  |  |  | 1,355,416 |  |  | $ | 25.36 |
Exercisable at end of year |  |  | 762,132 |  |  | $ | 26.07 |  |  |  | 594,906 |  |  | $ | 25.55 |  |  |  | 603,834 |  |  | $ | 23.66 |
Weighted average fair market value of options granted |  | $ | 3.05 |  |  |  |  |  |  | $ | 3.30 |  |  |  |  |  |  | $ | 2.93 |  |  |  |  |
|  | Weighted Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value
Outstanding – December 31, 2016 |  |  | 3.6 |  |  | $ | 7,686,000 |
Exercisable – December 31, 2016 |  |  | 2.6 |  |  | $ | 3,989,000 |
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 30, 2016 of $31.30 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, 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 |
Granted |  |  | 299,700 |  |  |  | 25.64 |  |  |  | 3.30 |
Vested |  |  | (275,187 | ) |  |  | 26.14 |  |  |  | 3.36 |
Forfeited |  |  | (19,175 | ) |  |  | 26.59 |  |  |  | 3.14 |
Non-vested – December 31, 2015 |  |  | 756,920 |  |  | $ | 26.53 |  |  | $ | 3.10 |
Granted |  |  | 277,800 |  |  |  | 25.51 |  |  |  | 3.05 |
Vested |  |  | (293,720 | ) |  |  | 26.39 |  |  |  | 3.13 |
Forfeited |  |  | (16,875 | ) |  |  | 26.37 |  |  |  | 3.10 |
Non-vested – December 31, 2016 |  |  | 724,125 |  |  | $ | 26.20 |  |  | $ | 3.07 |
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, 2016:
|  | 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
$23.53 to $25.86 |  |  | 865,207 |  |  |  | 3.8 |  |  | $ | 24.95 |  |  |  | 373,832 |  |  | $ | 24.14 |
$27.04 to $28.50 |  |  | 621,050 |  |  |  | 3.3 |  |  | $ | 27.77 |  |  |  | 388,300 |  |  | $ | 27.92 |
|  |  | 1,486,257 |  |  |  | 3.6 |  |  | $ | 26.13 |  |  |  | 762,132 |  |  | $ | 26.07 |
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:
|  | 2016 |  | 2015 |  | 2014
|  | (Dollars in thousands)
Total intrinsic value of stock options exercised |  | $ | 455 |  |  | $ | 1,705 |  |  | $ | 1,108 |
Cash received from stock option exercises |  | $ | 2,994 |  |  | $ | 6,144 |  |  | $ | 4,881 |
Income tax benefit from the exercise of stock options |  | $ | 178 |  |  | $ | 665 |  |  | $ | 432 |
Total fair value of stock options vested |  | $ | 919 |  |  | $ | 925 |  |  | $ | 923 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | ## The following table summarizes restricted stock award activity during the years ended December 31, 2014, 2015 and 2016:
Non-vested Restricted Stock |  | Shares of Restricted Stock |  | Weighted Average Grant Date Fair Value
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 |
Issued |  |  | 21,900 |  |  |  | 25.64 |
Vested |  |  | (20,700 | ) |  |  | 25.94 |
Forfeited |  |  | — |  |  |  | — |
Non-vested – December 31, 2015 |  |  | 55,250 |  |  | $ | 26.45 |
Issued |  |  | 26,900 |  |  |  | 25.51 |
Vested |  |  | (22,025 | ) |  |  | 26.26 |
Forfeited |  |  | (1,625 | ) |  |  | 26.30 |
Non-vested – December 31, 2016 |  |  | 58,500 |  |  | $ | 26.09 |

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