Stock-Based Compensation Plans (Stock Option Plan) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-Based Compensation Plans [Abstract]
Number of shares, options outstanding, beginning of year	88	95	121
Number of shares, granted	0	0	0
Number of shares, exercised	6	8	18
Number of shares, forfeited	0	0	8
Number of shares, expired	0	0	0
Number of shares, options outstanding, end of year	82	88	95
Number of shares, options exercisable	82	88	51
Weighted average exercise price per share, options outstanding, beginning of year	$ 22.95	$ 22.87	$ 22.81
Weighted average exercise price per share, granted	$ 0.00	$ 0.00	$ 0.00
Weighted average exercise price per share, exercised	$ 22.07	$ 22.07	$ 22.81
Weighted average exercise price per share, forfeited	$ 0.00	$ 0.00	$ 22.07
Weighted average exercise price per share, expired	$ 0.00	$ 0.00	$ 0.00
Weighted average exercise price per share, options outstanding, end of year	$ 23.00	$ 22.95	$ 22.87
Weighted average exercise price per share, options exercisable	$ 23.00	$ 22.95	$ 23.57

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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