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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Components of share-based compensation awards The following table summarizes the components of the Corporation's share-based compensation awards recorded as an expense and the income tax benefit of such awards.
 
Three Months Ended
March 31,
 
2019
 
2018
Stock and ESPP Options
 
 
 
Pre-tax compensation expense
$
11

 
$
24

Income tax benefit
(16
)
 
(59
)
Stock and ESPP option expense, net of income taxes
$
(5
)
 
$
(35
)
Restricted Stock Awards
 
 
 
Pre-tax compensation expense
$
970

 
$
851

Income tax benefit
(540
)
 
(566
)
Restricted stock awards expense, net of income taxes
$
430

 
$
285

Total Share-Based Compensation
 
 
 
Pre-tax compensation expense
$
981

 
$
875

Income tax benefit
(556
)
 
(625
)
Total share-based compensation expense, net of income taxes
$
425

 
$
250
Stock option activity under stock option plans Stock option activity under the Corporation's stock option plans as of March 31, 2019 and changes during the three months ended March 31, 2019, were as follows:
 
Number of
Shares
 
Weighted-Average Exercise Price
 
Weighted Average Remaining
Contractual Term
(in Years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2019
76,300

 
$
12.40

 
 
 
 
Exercised
(3,700
)
 
$
10.88

 
 
 
 
Cancelled
—

 
$
—

 
 
 
 
Outstanding March 31, 2019
72,600

 
$
12.48

 
2.73
 
$
1,769,628

Vested and Expected to Vest at March 31, 2019
72,600

 
$
12.48

 
2.73
 
$
1,769,628

Exercisable at March 31, 2019
72,600

 
$
12.48

 
2.73
 
$
1,769,628
Unvested RSAs outstanding The following table summarizes information on unvested RSAs outstanding as of March 31, 2019:
 
Number of Shares
 
Weighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2019
344,362

 
$
36.80

Granted
700

 
$
37.44

Vested
(103,660
)
 
$
23.41

Forfeited
(600
)
 
$
35.62

Unvested RSAs at March 31, 2019
240,802

 
$
42.57