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Stock Incentive Plans (Tables)
3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Shares Issued and Available Under Each Plans

A summary of the shares issued and available under each of the Plans is shown below as of March 31, 2018. Share data and exercise price range per share have been adjusted to reflect the 5% stock dividend effective April 13, 2018. Although the 2003 Plan and 2005 Plan have expired and no new grants will be issued under these plans, there were options issued before the plans expired which are still outstanding as shown below.

      2003 Plan       2005 Plan       2014 Plan
Aggregate shares issuable 134,787 241,500 262,500
Options issued, net of forfeited and expired options (113,457 ) (70,884 ) (2,100 )
Cancelled due to Plan expiration (21,330 ) (170,616 ) -
Remaining available for grant - - 260,400
 
Grants issued and outstanding:
                         
Total vested and unvested shares 16,348 21,478 1,575
                         
Fully vested shares 16,348 21,478 -
                         
Exercise price range $      17.39 to $      11.18 to $      28.76 to
$ 17.39 $ 22.15 $ 28.76
Summary of Stock Option Activity

Changes in the stock options outstanding related to all of the Plans are summarized below. Share and per share data have been retroactively adjusted to reflect the 5% stock dividend effective April 13, 2018. (Dollars in thousands except per share data):

March 31, 2018
            Weighted Average       Aggregate
Number of Options Exercise Price Intrinsic Value
Outstanding at January 1, 2018                   46,121 $      19.96
Exercised (6,720 ) 21.50 $      111
Outstanding at March 31, 2018 39,401 $ 19.69 $ 844
                   
Options exercisable at March 31, 2018 37,826 $ 19.32 $ 824
Schedule of Options Outstanding and Exercisable, by Exercise Price Range

Summary information pertaining to options outstanding at March 31, 2018 is shown below. Share and per share data have been retroactively adjusted to reflect the 5% stock dividend effective April 13, 2018.

Options Outstanding Options Exercisable
            Weighted-       Weighted-             Weighted-
Number of Average Average Number of Average
Options Remaining Exercise Options Exercise
Exercise Price Outstanding Contractual Life Price Exercisable Price
$11.18 to $20.00 18,766 1.3 Years $      16.97 18,766 $      16.97
$20.01 to $28.76 20,635 1.1 Years 22.17 19,060 21.63
Total 39,401 1.2 Years $ 19.69 37,826 $ 19.32