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Retirement and Share-based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation Expense By Plan
The following table summarizes compensation expense recognized for employees and directors as a result of share-based compensation:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(Dollars in thousands)
ESOP
$
1,474

 
$
2,522

 
$
2,604

Employee Incentive Plans
2,155

 
1,207

 
1,911

Director Equity and Incentive Plan and Stock Option Plan
812

 
685

 
613

 
$
4,441

 
$
4,414

 
$
5,128
Changes in Stock Options Outstanding
Changes in the number of stock options outstanding during the years ended December 31, 2017, 2016 and 2015 are as follows:
 
Number of
Shares
 
Weighted-Average
Exercise Price
per Share
 
Total
Exercise
Price
 
(Dollars in thousands, except per share data)
Outstanding at January 1, 2015
4,044,175

 
$
15.02

 
$
60,760

Granted
—

 
—

 
—

Canceled
(47,300
)
 
10.54

 
(499
)
Exercised
(552,884
)
 
14.51

 
(8,021
)
Outstanding at December 31, 2015
3,443,991

 
15.17

 
52,240

Granted
—

 
—

 
—

Canceled
(24,700
)
 
14.83

 
(366
)
Exercised
(500,345
)
 
9.97

 
(4,989
)
Outstanding at December 31, 2016
2,918,946

 
16.06

 
46,885

Granted
—

 
—

 
—

Canceled
(57,200
)
 
13.66

 
(781
)
Exercised
(881,481
)
 
15.90

 
(14,020
)
Outstanding at December 31, 2017
1,980,265

 
16.20

 
$
32,084
Schedule of Stock Options Outstanding, By Exercise Price Range
The following table summarizes information about stock options outstanding at December 31, 2017:
 
Stock Options Outstanding and Vested
Range of Exercise Prices
Number of
Awards
 
Remaining
Life (yrs)
 
Weighted-Average
Exercise Price
Per Share
$5.07 - $8.02
182,500

 
1.36
 
$
6.85

$9.27 - $11.35
575,055

 
1.75
 
10.15

$12.04 - $24.79
1,222,710

 
2.53
 
20.44

$5.07 - $24.79
1,980,265

 
2.20
 
16.20