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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Assumptions
The following weighted average assumptions were used to determine the fair value of the stock options granted on the original grant date for expense recognition purposes for options granted during the nine months ended September 30, 2019 and 2018 using a Black Scholes-Merton Model:
 
 Nine months ended
 September 30, 2019September 30, 2018
Directors and Officers:  
Expected dividend rate$0.32  $0.26  
Expected volatility29.54%  29.73%  
Risk-free interest rate2.40%  2.20%  
Expected life (in years)5.05.0
Employees:  
Expected dividend rate$0.32  $0.26  
Expected volatility29.54%  29.82%  
Risk-free interest rate2.39%  2.48%  
Expected life (in years)5.05.0
Summary of Stock Options Outstanding
The following is a summary of stock options vested and exercisable as of September 30, 2019:
 
Range of
Exercise
Prices		Number
of
Shares		Weighted
Average
Remaining
Contractual Life
(in years)		Weighted
Average
Exercise
Price
Intrinsic
Value
(in thousands)
$7.18  -$33.20  350,549  5.29$21.07  $8,717  
$33.40  -$40.87  124,622  7.7935.63  1,284  
$41.37  -$50.68  4,070  0.6741.37  19  
Total479,241  5.90$25.03  $10,020  
 
The following is a summary of stock options vested and exercisable as of September 30, 2018:

Range of
Exercise
Prices		Number
of
Shares		Weighted
Average
Remaining
Contractual Life
(in years)		Weighted
Average
Exercise
Price
Intrinsic
Value
(in thousands)
$5.67  -$32.80  362,715  5.54$18.14  $7,132  
$32.85  -$33.80  5,484  4.0833.18  25  
$34.00  -$40.60  81,417  5.8734.32  283  
Total449,616  5.58$21.25  $7,440  
Summary of Stock Option Activity
A summary of option activity under the plans is as follows:
SharesWeighted
Average
Exercise
Price
Outstanding at December 31, 2018
2,445,849  $30.77  
Granted
1,965,520  41.46  
Exercised
(394,024) 28.63  
Forfeited or Expired
(293,299) 36.71  
Outstanding at September 30, 2019
3,724,046  $36.17  
Exercisable at September 30, 2019
479,241  $25.03  
Summary of Unvested Restricted Stock Awards
A summary of the unvested restricted stock awards is as follows:
 
SharesWeighted
Average
Grant Date
Fair Value
Unvested at December 31, 2018
292,450  $28.54  
Granted
112,018  40.92  
Vested
(109,514) 26.99  
Forfeited
(12,103) 33.87  
Unvested at September 30, 2019
282,851  $33.81  
Summary of Share-Based Compensation Expense
A summary of share-based compensation is as follows: 
Three months endedNine months ended
 September 30,
2019		September 30,
2018		September 30,
2019		September 30,
2018
Grant date fair value of awards during the period:(in thousands)
Options$244  $53  $20,315  $12,633  
Restricted stock—  18  4,584  3,379  
Total$244  $71  $24,899  $16,012  
Share-based compensation expense:
Options$1,874  $1,076  $5,156  $3,202  
Restricted stock911  839  2,702  2,412  
Total$2,785  $1,915  $7,858  $5,614  
Income tax benefit/(deficiency) related to share-based compensation:
Options$233  $379  $964  $980  
Restricted stock7  26  462  245  
Total$240  $405  $1,426  $1,225