Accumulated Other Comprehensive Loss Income (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
Accumulated Other Comprehensive (Loss) Income [Abstract]
Net Unrealized Gains on Available for Sale Investment Securities, Beginning Balance	$ 7,306		$ 884
Net Change in Fair Value of Derivative Used for Cash Flow Hedges, Beginning Balance	(932)		320
Net Change Related to Defined Benefit Pension Plan, Beginning Balance	(12,475)		(7,970)
Accumulated Other Comprehensive (Loss) Income, Beginning Balance	(6,101)	[1]	(6,766)
Net Unrealized Gains on Available for Sale Investment Securities, Net Change	1,909		5,470
Net Change in Fair Value of Derivative Used for Cash Flow Hedges, Net Change	(391)		(1,195)
Net Change Related to Defined Benefit Pension Plan, Net Change	448		240
Accumulated Other Comprehensive (loss) Income, Net Change	1,966		4,515
Net Unrealized Gains on Available for Sale Investment Securities, Ending Balance	9,215		6,354
Net Change in fair Value of Derivative Used for Cash Flow Hedges, Ending Balance	(1,323)		(875)
Net Change Related to Defined Benefit Pension Plan, Ending Balance	(12,027)		(7,730)
Accumulated Other Comprehensive (Loss) Income, Ending Balance	$ (4,135)		$ (2,251)

[1] Note: The consolidated balance sheet at December 31, 2011 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U. S. generally accepted accounting principles for complete financial statements. Certain amounts have been reclassified to conform to the current-year presentation. See accompanying notes to the unaudited consolidated financial statements.