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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] The following table sets forth the status of the Company’s non-vested and vested restricted shares and changes for the years ended December 31, 2016, 2015 and 2014:
 
2016
 
2015
 
2014
  
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
Outstanding, beginning of year
111,084

 
$
22.19

 
76,472

 
$
19.06

 
38,233

 
$
15.06

Granted
45,252

 
21.55

 
74,020

 
22.83

 
56,178

 
21.23

Vested
(33,414
)
 
21.93

 
(35,859
)
 
16.88

 
(16,892
)
 
17.08

Canceled
(15,625
)
 
21.91

 
(3,549
)
—

21.92

 
(1,047
)
 
21.23

Outstanding, end of year
107,297

 
$
22.04

 
111,084

 
$
22.19

 
76,472

 
$
19.06

 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] The following table sets forth the weighted average fair values and related assumptions for options granted for the years ended December 31, 2016, 2015 and 2014:
 
2016
 
2015
 
2014
Fair value per share
$
6.75

 
$
7.69

 
$
7.28

Expected dividend yield
1.87
%
 
1.75
%
 
1.86
%
Risk free interest rate
1.30
%
 
1.60
%
 
1.65
%
Expected volatility factor
36.27
%
 
36.61
%
 
39.23
%
Expected life in years
5.3

 
6.0

 
5.7
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] The following table sets forth the Company’s total activity and related information for these plans for the years ended December 31, 2016, 2015 and 2014:
(millions, except per share amounts)
2016
 
2015
 
2014
  
Options
 
Weighted-
Average
Exercise
Price
 
Options
 
Weighted-
Average
Exercise
Price
 
Options
 
Weighted-
Average
Exercise
Price
Outstanding, beginning of year
3.4

 
$
21.44

 
3.7

 
$
21.29

 
3.9

 
$
22.01

Granted
0.3

 
21.47

 
0.4

 
22.87

 
0.3

 
21.20

Exercised
(0.4
)
 
17.55

 
(0.3
)
 
16.56

 
(0.1
)
 
16.43

Canceled
(0.5
)
 
29.81

 
(0.4
)
 
25.18

 
(0.4
)
 
30.21

Outstanding, end of year
2.8

 
$
20.67

 
3.4

 
$
21.44

 
3.7

 
$
21.29

 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] The following table sets forth information pertaining to the total options outstanding and exercisable at December 31, 2016:
(Options in millions)
Options Outstanding
 
Options Exercisable
  
Number
 
Weighted-
Average
Remaining
Contractual Life
 
Weighted-
Average
Exercise
Price
 
Number
 
Weighted-
Average
Exercise
Price
Range of Exercise Prices:
 
 
 
 
 
 
 
 
 
$10.01 – $20.00
1.4

 
4.1
 
$
16.44

 
1.3

 
$
16.46

$20.01 – $30.00
1.4

 
3.6
 
24.57

 
0.9

 
25.96

 
2.8

 
3.8
 
$
20.67

 
2.2

 
$
20.53