Accumulated Other Comprehensive Loss Income (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011		Dec. 31, 2010
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, Net Change	206	3,667
Net Unrealized Gains on Available for Sale Investment Securities, Net Change	159	3,744
Net Change in Fair Value of Derivative Used for Cash Flow Hedges, Net Change	(253)	(242)
Net Change Related to Defined Benefit Pension Plan, Net Change	300	165
Unrealized Gains on Available for Sale Investment Securities, Ending Balance	7,465	4,628
Net Change in fair Value of Derivative Used for Cash Flow Hedges, Ending Balance	(1,185)	78
Net Change Related to Defined Benefit Pension Plan, Ending Balance	(12,175)	(7,805)
Accumulated other comprehensive loss, net of taxes	$ (5,895)	$ (3,099)	$ (6,101)	[1]	$ (6,766)

[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.