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Stock-Based Compensation Plans (Schedule of Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended |
|---|---|
|
Dec. 31, 2014
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|
| Number of Shares | |
| Options outstanding, beginning | 111,950 |
| Granted | 4,500 |
| Exercised | (19,000) |
| Forfeited and expired | (3,200) |
| Options outstanding, ending | 94,250 |
| Options exercisable | 73,150 |
| Weighted Average Exercise Price Per Share | |
| Options outstanding, beginning | $ 33.36 |
| Granted | $ 35.22 |
| Exercised | $ 32.58 |
| Forfeited and expired | $ 38.32 |
| Options outstanding, ending | $ 33.44 |
| Options exercisable | $ 33.21 |
| Weighted- Average Remaining Contractual Term | |
| Options outstanding | 4 years 6 months |
| Options exercisable | 3 years 9 months 18 days |
| Aggregate Intrinsic Value | |
| Options outstanding | $ 664 |
| Options exercisable | $ 545 |