Other Comprehensive Income/Loss (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Comprehensive Income/Loss
Net unrealized holding gain on securities available-for-sale arising during the period, Before Tax Amount	$ 200
Net unrealized holding gain on securities available-for-sale arising during the period, Tax Expense	(70)
Net unrealized holding gain on securities available-for-sale arising during the period, After Tax Amount	130	(814)
Reclassification adjustment for net actuarial loss included in net income, Before Tax Amount	967
Reclassification adjustment for net actuarial loss included in net income, Tax Expense	(340)
Reclassification adjustment for net actuarial loss included in net income, After Tax Amount	627	2,201
Reclassification adjustment for prior service cost included in net income, Before Tax Amount	53
Reclassification adjustment for prior service cost included in net income, Tax Expense	(19)
Reclassification adjustment for prior service cost included in net income, After Tax Amount	34	2
Other Comprehensive income, Before Tax Amount	1,220
Other Comprehensive income, Tax Expense	(429)
Total other comprehensive income, net of tax	$ 791	$ 20,582