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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Share-Based Compensation Amounts Included in Net Income | The table below presents the amounts included in net income related to share-based compensation expense for the awards granted under the DSCP and the PIP for the years ended December 31, 2012, 2011 and 2010:
For the Years Ended December 31, |  | 2012 |  |  | 2011 |  |  | 2010 |
(in thousands) |  |  |  |  |  |  |  |  |
Directors Stock Compensation Plan |  | $ | 443 |  |  | $ | 407 |  |  | $ | 283 |
Performance Incentive Plan |  |  | 976 |  |  |  | 1,043 |  |  |  | 872 |
Total compensation expense |  |  | 1,419 |  |  |  | 1,450 |  |  |  | 1,155 |
Less: tax benefit |  |  | 569 |  |  |  | 581 |  |  |  | 463 |
Share-Based Compensation amounts included in net income |  | $ | 850 |  |  | $ | 869 |  |  | $ | 692 |
Directors Stock Compensation Plan [Member] |
Summary of Stock Activity under DSCP | A summary of stock activity under the DSCP for the years ended December 31, 2012, 2011 and 2010 is presented below.
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding — December 31, 2010 |  |  | — |  |  |  | — |
Granted (1) |  |  | 11,104 |  |  | $ | 41.02 |
Vested |  |  | 11,104 |  |  | $ | 41.02 |
Forfeited |  |  | — |  |  |  | — |
Outstanding — December 31, 2011 |  |  | — |  |  |  | — |
Granted |  |  | 10,800 |  |  | $ | 41.06 |
Vested |  |  | 10,800 |  |  | $ | 41.06 |
Forfeited |  |  | — |  |  |  | — |
Outstanding — December 31, 2012 |  |  | — |  |  |  | — |
(1) | In January 2011, our former Chief Executive Officer retired from the Company and was awarded 304 shares of common stock for the prorated portion of his service period as he began his service as a non-executive board member.
Performance Incentive Plan [Member] |
Summary of Stock Activity under DSCP | A summary of stock activity under the PIP is presented below:
|  | Number of Shares |  |  | Weighted Average Fair Value |
Outstanding — December 31, 2010 |  |  | 101,150 |  |  | $ | 28.78 |
Granted |  |  | 41,664 |  |  | $ | 40.16 |
Vested |  |  | 31,400 |  |  | $ | 27.63 |
Fortfeited |  |  | 24,000 |  |  | $ | 29.31 |
Expired |  |  | — |  |  |  | — |
Outstanding — December 31, 2011 |  |  | 87,414 |  |  | $ | 34.47 |
Granted |  |  | 35,706 |  |  | $ | 39.62 |
Vested |  |  | 13,837 |  |  | $ | 29.19 |
Fortfeited(1) |  |  | 21,600 |  |  | $ | 36.57 |
Expired |  |  | 3,038 |  |  | $ | 26.29 |
Outstanding — December 31, 2012 |  |  | 84,645 |  |  | $ | 37.86 |
(1) | Includes shares settled with a cash payment pursuant to the terms of a separation agreement with a former named executive officer.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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