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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes the Company’s stock option activity for the six-month period ended June 30, 2018:
 
 
 
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
 
Weighted
 
 
Average
 
 
 
 
 
 
 
 
 
Average
 
 
Remaining
 
 
Aggregate
 
 
 
 
 
 
Exercise
 
 
Contractual
 
 
Intrinsic
 
 
 
Shares
 
 
Price
 
 
Term (Years)
 
 
Value*
 
Outstanding at December 31, 2017
 
 
1,502,493
 
 
$
26.57
 
 
 
 
 
 
 
 
 
Exercised
 
 
(352,566
)
 
$
25.82
 
 
 
 
 
 
 
 
 
Forfeited or expired
 
 
(11,075
)
 
$
26.57
 
 
 
 
 
 
 
 
 
Outstanding at June 30, 2018
 
 
1,138,852
 
 
$
26.80
 
 
 
4.0
 
 
$
10,936,000
 
Exercisable at June 30, 2018
 
 
524,690
 
 
$
27.10
 
 
 
2.3
 
 
$
4,878,000
 
 
* 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 June 29, 2018, the last trading day of the quarter, of $36.40 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.
Share-based Compensation, Stock Options Exercised, Activity [Table Text Block]
The following table summarizes the Company’s stock option exercise activity for the three and six months ended June 30, 2018 and 2017:
 
 
 
Three Months Ended June 30,
 
 
Six Months Ended June 30,
 
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
 
 
(Dollars in thousands)
 
Total intrinsic value of stock options exercised
 
$
2,549
 
 
$
23
 
 
$
3,050
 
 
$
64
 
Net cash proceeds from stock option exercises
 
$
1,164
 
 
$
82
 
 
$
4,048
 
 
$
438
 
Income tax benefit from the exercise of stock options
 
$
663
 
 
$
10
 
 
$
793
 
 
$
25
 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
The following table summarizes the Company’s restricted stock award activity for the six-month period ended June 30, 2018:
 
 
 
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
 
Weighted
 
 
Average
 
 
 
 
 
 
Shares of
 
 
Average
 
 
Remaining
 
 
Aggregate
 
 
 
Restricted
 
 
Grant Date
 
 
Contractual
 
 
Intrinsic
 
 
 
Stock
 
 
Fair Value
 
 
Term (Years)
 
 
Value*
 
Non-vested at December 31, 2017
 
 
66,050
 
 
$
26.79
 
 
 
 
 
 
 
 
 
Issued
 
 
2,439
 
 
$
35.55
 
 
 
 
 
 
 
 
 
Vested
 
 
(2,439
)
 
$
35.55
 
 
 
 
 
 
 
 
 
Forfeited
 
 
(1,675
)
 
 
26.59
 
 
 
 
 
 
 
 
 
Non-vested at June 30, 2018
 
 
64,375
 
 
$
26.80
 
 
 
2.3
 
 
$
2,343,000
 
 
* The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of the Company's stock on June 29, 2018 of $36.40 multiplied by the number of non-vested restricted shares outstanding.