Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (1,712)	$ (1,318)
Other comprehensive income (loss) before reclassifications	(93)	(213)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income	(93)	(213)
Ending balance	(1,805)	(1,530)
Gains/(Losses) on Cash Flow Hedges [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(361)	(180)
Other comprehensive income (loss) before reclassifications	34	(157)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income	34	(157)
Ending balance	(327)	(337)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,398)	(1,376)
Other comprehensive income (loss) before reclassifications	(127)	(56)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income	(127)	(56)
Ending balance	(1,525)	(1,432)
Supplemental Executive Retirement Plans [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	47	239
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income	0	0
Ending balance	$ 47	$ 239

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.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Regulation S-X (SX)

-Number 210

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-Article 5

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Net of tax amount of other comprehensive income (loss) attributable to the parent entity.

+ References

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

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-Name Accounting Research Bulletin (ARB)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Research Bulletin (ARB)

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+ Details