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STOCK-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
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