Changes in Accumulated Other Comprehensive Income Balances (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Balance			$ 6,446
Other comprehensive income (loss):
Change in net actuarial loss	120	72	362	215
Tax effect on change in net actuarial loss	42	25	127	75
Net unrealized holding losses arising during the period	4,541	(8,134)	4,560	(8,254)
Tax effect on unrealized gains arising during the period	1,589	(2,847)	1,596	(2,889)
Reclassification adjustment for gains (losses) included in net income	926	393	2,044	3,177
Tax effect on reclassification adjustment for gains (losses) included in net income	(324)	(137)	(715)	(1,112)
Other comprehensive income (loss), net of tax	2,428	(5,496)	1,870	(7,290)
Balance	8,316		8,316
Minimum Pension Liability [Member]
Balance			(2,978)	(2,024)
Other comprehensive income (loss):
Change in net actuarial loss			362	215
Tax effect on change in net actuarial loss			(127)	(75)
Net unrealized holding losses arising during the period			0	0
Tax effect on unrealized gains arising during the period			0	0
Reclassification adjustment for gains (losses) included in net income			0	0
Tax effect on reclassification adjustment for gains (losses) included in net income			0	0
Other comprehensive income (loss), net of tax			235	140
Balance	(2,743)	(1,884)	(2,743)	(1,884)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Balance			9,424	11,661
Other comprehensive income (loss):
Change in net actuarial loss			0	0
Tax effect on change in net actuarial loss			0	0
Net unrealized holding losses arising during the period			4,560	(8,254)
Tax effect on unrealized gains arising during the period			(1,596)	2,889
Reclassification adjustment for gains (losses) included in net income			(2,044)	(3,177)
Tax effect on reclassification adjustment for gains (losses) included in net income			715	1,112
Other comprehensive income (loss), net of tax			1,635	(7,430)
Balance	11,059	4,231	11,059	4,231
Accumulated Other Comprehensive Income (Loss) [Member]
Balance			6,446	9,637
Other comprehensive income (loss):
Change in net actuarial loss			362	215
Tax effect on change in net actuarial loss			(127)	(75)
Net unrealized holding losses arising during the period			4,560	(8,254)
Tax effect on unrealized gains arising during the period			(1,596)	2,889
Reclassification adjustment for gains (losses) included in net income			(2,044)	(3,177)
Tax effect on reclassification adjustment for gains (losses) included in net income			715	1,112
Other comprehensive income (loss), net of tax			1,870	(7,290)
Balance	$ 8,316	$ 2,347	$ 8,316	$ 2,347