Comprehensive Income/Loss (Details1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance	$ (4,526)	$ (4,486)
Net change in other comprehensive income (loss)	57	658
Ending Balance	(4,469)	(3,828)
Unrealized Gain on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance	5,478	6,574
Net change in other comprehensive income (loss)	(777)	(161)
Ending Balance	4,701	6,413
Unrealized Loss on Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance	(9,577)	(10,804)
Net change in other comprehensive income (loss)	869	832
Ending Balance	(8,708)	(9,972)
Deferred Gain on Hedge Transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance	859	1,004
Net change in other comprehensive income (loss)	(36)	(36)
Ending Balance	823	968
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance	(1,286)	(1,260)
Net change in other comprehensive income (loss)	(1)	(23)
Ending Balance	$ (1,285)	$ (1,237)