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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Following is a summary of stock option activity for the three-year period ending December 31, 2017:  
 
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at January 1, 2015
 
 
1,008,781
 
 
$
13.87
 
 
 
  
 
 
 
  
 
Exercised
 
 
(267,440
) 
 
$
7.19
 
 
 
  
 
 
 
  
 
Forfeited
 
 
(1,290
) 
 
$
23.14
 
 
 
  
 
 
 
  
 
Expired
 
 
(9,446
) 
 
$
5.92
 
 
 
 
 
 
 
Outstanding at December 31, 2015
 
 
730,605
 
 
$
16.40
 
 
 
3.6 years
 
 
$
3,722
 
Exercised
 
 
(443,283
) 
 
$
14.03
 
 
 
  
 
 
 
  
 
Forfeited
 
 
(933
) 
 
$
24.68
 
 
 
  
 
 
 
  
 
Expired
 
 
(40,672
) 
 
$
21.40
 
 
 
 
 
 
 
Outstanding at December 31, 2016
 
 
245,717
 
 
$
19.82
 
 
 
4.4 years
 
 
$
4,396
 
Exercised
 
 
(79,797
) 
 
$
15.43
 
 
 
 
 
 
 
Outstanding and Exercisable at December 31, 2017
 
 
165,920
 
 
$
21.92
 
 
 
4.2 years
 
 
$
2,292
 
Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block]
Other data relating to option activity for the years ended December 31 are as follows:
 
 
(dollars in thousands)
 
2017
 
2016
 
2015
Intrinsic value of options exercised
 
$
1,721
 
 
$
7,832
 
 
$
5,857
 
Fair value of options vested
 
 
—
 
 
 
372
 
 
 
948
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes information with respect to stock options outstanding and exercisable under the Company’s plans at December 31, 2017:
 
 
 
Options Outstanding and Exercisable
Exercise Price
 
Number Of
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
$17.18 – $17.48
 
 
60,267
 
 
$
17.44
 
 
 
3.9 years
 
$24.18 – $24.18
 
 
44,151
 
 
$
24.18
 
 
 
3.2 years
 
$24.68 – $24.68
 
 
61,502
 
 
$
24.68
 
 
 
5.2 years
 
  
 
 
165,920
 
 
$
21.92
 
 
 
4.2 years
 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Following is a summary of time-vested stock awards activity for the three-year period ending December 31, 2017:
 
 
 
Shares
 
Per Share
Weighted-
Average
Grant Date
Fair Value
Outstanding unvested at January 1, 2015
 
 
220,337
 
 
$
22.64
 
Granted
 
 
87,040
 
 
$
29.23
 
Vested
 
 
(102,297
) 
 
$
22.42
 
Forfeited
 
 
(3,131
) 
 
$
24.10
 
Outstanding unvested at December 31, 2015
 
 
201,949
 
 
$
24.58
 
Granted
 
 
112,912
 
 
$
24.66
 
Vested
 
 
(88,301
) 
 
$
25.18
 
Forfeited
 
 
(3,144
) 
 
$
26.09
 
Outstanding unvested at December 31, 2016
 
 
223,416
 
 
$
25.26
 
Granted
 
 
66,352
 
 
$
37.49
 
Vested
 
 
(99,774
) 
 
$
25.19
 
Forfeited
 
 
(1,346
) 
 
$
31.22
 
Outstanding unvested at December 31, 2017
 
 
188,648
 
 
$
29.55
 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
Following is a summary of performance share award activity for the three-year period ending December 31, 2017:
 
 
 
Shares
 
Per Share
Weighted-
Average
Grant Date
Fair Value
Outstanding at January 1, 2015
 
 
126,803
 
 
$
26.63
 
Granted at target
 
 
69,978
 
 
$
38.70
 
Vested
 
 
(40,474
) 
 
$
24.68
 
Forfeited for performance below target
 
 
(3,810
) 
 
$
24.68
 
Forfeited
 
 
(8,889
) 
 
$
30.87
 
Outstanding at December 31, 2015
 
 
143,608
 
 
$
32.68
 
Granted at target
 
 
79,661
 
 
$
28.25
 
Earned for performance above target
 
 
20,650
 
 
$
31.01
 
Vested
 
 
(98,270
) 
 
$
27.74
 
Forfeited
 
 
(1,626
) 
 
$
32.96
 
Outstanding at December 31, 2016
 
 
144,023
 
 
$
32.92
 
Granted at target
 
 
47,454
 
 
$
47.12
 
Forfeited for performance below target
 
 
(24,873)
 
 
$
36.40
 
Vested
 
 
(39,407
) 
 
$
40.15
 
Forfeited
 
 
(222
) 
 
$
37.22
 
Outstanding at December 31, 2017
 
 
126,975
 
 
$
35.29