Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Increase (Decrease} In Accumulated Other Comprehensive Income (Loss), Net Of Tax1 [Roll Forward]
Beginning balance	$ (1,667)	$ (4,894)
Other comprehensive income before reclassifications	797	3,516
Amounts reclassified from accumulated other comprehensive income (loss)	(436)	(259)
Total other comprehensive income	361	3,257
Ending balance	(1,306)	(1,637)
Net Unrealized Gain on Available for Sale Securities
Increase (Decrease} In Accumulated Other Comprehensive Income (Loss), Net Of Tax1 [Roll Forward]
Beginning balance	2,930	(2,169)
Other comprehensive income before reclassifications	797	3,516
Amounts reclassified from accumulated other comprehensive income (loss)	(436)	(259)
Total other comprehensive income	361	3,257
Ending balance	3,291	1,088
Defined Benefit Plan
Increase (Decrease} In Accumulated Other Comprehensive Income (Loss), Net Of Tax1 [Roll Forward]
Beginning balance	(4,597)	(2,725)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income	0	0
Ending balance	$ (4,597)	$ (2,725)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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