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Stock-Based Compensation Plans (Additional Information) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
|
12 Months Ended |
0 Months Ended |
|
Dec. 31, 2014
|
Dec. 31, 2013
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Dec. 31, 2012
|
May 01, 2012
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Percentage of total compensation |
4.00% |
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| Stock Option and Incentive Plan 2003 [Member] |
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|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Maximum number of shares of stock reserved and available for issuance |
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|
|
800,000 |
| Stock Option and Incentive Plan 2012 [Member] |
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|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Stock based compensation, vesting period |
5 years |
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|
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| Stock based compensation, option granted, contractual life |
10 years |
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|
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| Stock Options [Member] |
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|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
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| Share-based compensation |
81 |
$ 134 |
$ 99 |
|
| Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |
28 |
47 |
35 |
|
| Unrecognized compensation cost for nonvested stock options |
103 |
|
|
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| Unrecognized compensation cost, recognition period |
2 years 9 months 0 days |
|
|
|
| Total intrinsic value of options exercised |
134 |
153 |
146 |
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| Restricted Stock Awards and Management Stock Purchase Plan [Member] |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
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| Share-based compensation |
321 |
222 |
228 |
|
| Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |
112 |
78 |
80 |
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| Unrecognized compensation cost, recognition period |
1 year 8 months 12 days |
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|
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| Unrecognized compensation cost related to nonvested shares |
207 |
|
|
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| Management Stock Purchase Plan [Member] |
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|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
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| Exercise price as a percentage of fair market value on the date of grant |
0.00% |
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| Stock based compensation, vesting period |
2 years |
|
|
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| Share-based compensation |
67 |
73 |
65 |
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| Granted |
5,055 |
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| Long-Term Performance Share Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
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| Share-based compensation |
151 |
200 |
174 |
|
| Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |
53 |
70 |
61 |
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| Unrecognized compensation cost, recognition period |
1 year 9 months 18 days |
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|
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| Unrecognized compensation cost related to nonvested shares |
338 |
|
|
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| Granted |
20,613 |
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| Deferred Stock Awards [Member] |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Share-based compensation |
46 |
40 |
37 |
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| Unrecognized compensation cost, recognition period |
12 years 1 month 6 days |
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| Unrecognized compensation cost related to nonvested shares |
191 |
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|
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| Percentage of total compensation |
10.00% |
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|
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| Percentage vested on 65th birthday |
100.00% |
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| Granted |
2,020 |
2,304 |
2,322 |
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| Qualified Stock Options [Member] | Stock Option and Incentive Plan 2012 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Exercise price as a percentage of fair market value on the date of grant |
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|
|
100.00% |
| Nonqualified Stock Options [Member] | Stock Option and Incentive Plan 2012 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price as a percentage of fair market value on the date of grant |
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|
85.00% |
| Executive Officer [Member] | Stock Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Forfeiture rate |
0.00% |
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| Management [Member] | Stock Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Forfeiture rate |
13.00% |
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