Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in Plan Assets
Employer contributions	$ 306	$ 240
Pension Plans, Defined Benefit [Member]
Change in Benefit Obligation
Benefit obligation, beginning of year	5,995	5,588	4,747
Service cost	427	359	307
Interest cost	269	307	284
Actuarial loss	725	871	565
Benefits paid	(172)	(1,097)	(315)
Gain due to settlement		(33)
Benefit obligation, end of year	7,244	5,995	5,588
Changes in Plan Assets
Fair value of plan assets, beginning of year	3,454	4,284	3,921
Actual return on plan assets	458	27	478
Employer contributions	306	240	200
Benefits paid	(172)	(1,097)	(315)
Fair value of assets, end of year	4,046	3,454	4,284
Funded Status, end of year	(3,198)	(2,541)	(1,303)
Amount Recognized in Other Liabilities	$ (3,198)	$ (2,541)	$ (1,303)

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The increase in the fair value of plan assets from contributions made by the employer.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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