Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011
Accumulated other comprehensive income balances, net of tax [Abstract]
Net unrealized holding gain (loss) on securities available for sale	$ 6,297	$ 6,297		$ 3,022	$ (1,018)
Net change in funded status of pension and postretirement benefit plans	(1,418)	(1,418)		(1,437)	(1,475)
Accumulated other comprehensive income (loss)	4,879	4,879		1,585	(2,493)
Net unrealized holding gain (loss) on securities available for sale, YTD/QTD change	3,275	7,315
Net change in funded status of pension and postretirement benefit plans, YTD/QTD change	19	57
Other comprehensive income (loss) YTD/QTD change	$ 3,294	$ 7,372	$ 4,377