Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive income balances, net of tax [Abstract]
Net unrealized holding gain (loss) on securities available for sale	$ 3,022	$ 3,022		$ 1,509	$ (1,018)
Net change in funded status of pension and postretirement benefit plans	(1,437)	(1,437)		(1,456)	(1,475)
Accumulated other comprehensive income (loss)	1,585	1,585		53	(2,493)
Net unrealized holding gain (loss) on securities available for sale, YTD/QTD change	1,513	4,040
Net change in funded status of pension and postretirement benefit plans, YTD/QTD change	19	38
Other comprehensive income YTD/QTD change	$ 1,532	$ 4,078	$ 6,965