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Employee Benefit Plans (Detail Textuals 1) (Supplemental Retirement Plan ('SERP'), USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Retirement Plan ('SERP')
Defined Benefit Plan Disclosure [Line Items]
Variable life insurance policies investment amount	$ 44,300,000	$ 17,700,000
Fair value of plan assets	11,103,000	8,251,000
Trading gains (losses) related to the SERP assets	$ 1,352,000	$ (194,000)	$ 701,000

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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