Employee Compensation Plans - Schedule of Stock Option Activity (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, Number of shares, beginning of year	72,573	86,803
Options granted, Number of shares	2,976	951
Options exercised, Number of shares	(15,000)	(12,165)
Options forfeited or expired, Number of shares	(15,000)	(3,016)
Options outstanding, Number of shares, end of year	45,549	72,573
Share-based Compensation Arrangement by Share-based Payment Award, Options, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options outstanding, Weighted average exercise price, beginning of year	$ 24.46	$ 23.35
Options granted, Weighted average exercise price	$ 23.49	$ 17.20
Options exercised, Weighted average exercise price	$ 12.33	$ 12.30
Options forfeited or expired, Weighted average exercise price	$ 33.22	$ 39.45
Options outstanding, Weighted average exercise price, end of year	$ 25.50	$ 24.46
Options vested, Number of shares, end of year	30,513	45,683
Options vested, Weighted average exercise price, end of year	$ 25.99	$ 23.34
Weighted average fair value of options granted during the year, Number of shares	$ 9.94	$ 6.60

For presentations that combine terminations, 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 or that expired.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price of options that were either forfeited or expired.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB

-Name Accounting Standards Codification

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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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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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-Publisher FASB

-Name Accounting Standards Codification

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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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 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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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