Marketable Securities - Additional Information (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Fair market value of investment securities exceeds cost basis	$ 584,000
Other-than-temporary impairments recorded for securities	0
Changes in unrealized gains on available for sale securities, taxes	182,000	(82,000)	(3,000)
Estimated taxes of change in value of available-for-sale securities	72,000
Gross unrealized holding gains	669,000
Gross unrealized holding losses	$ 85,000

Available for sale securities, fair market value exceeds cost basis, by amount.

No definition available.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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- Definition

Before tax amount of the appreciation (loss) in the value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) losses.

+ References

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

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-Topic 220

-SubTopic 10

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-Paragraph 10A

-Subparagraph (e)

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- Definition

Tax effect of the appreciation (loss) in the value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) losses.

+ References

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- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ References

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