Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Retirement Plans:
Retirement plan net losses recognized in plan expenses	$ 78	$ 67	$ 318	$ 200
Gain on pension plan curtailment	0	0	1,919	0
Unrealized holding loss on financial derivative:
Change in unrealized holding loss on financial derivative	(18)	(87)	(53)	(141)
Reclassification adjustment for interest expense included in net income	13	17	43	46
Net unrealized loss on financial derivative	(5)	(70)	(10)	(95)
Unrealized holding gains (losses) on available-for-sale securities:
Unrealized holding gains arising during the period	939	316	1,551	2,430
Reclassification adjustment for net gains included in income	(18)	(469)	(179)	(791)
Net unrealized gains (losses) on securities available-for-sale	921	(153)	1,372	1,639
Other comprehensive income (loss), before tax	994	(156)	3,599	1,744
Tax effect	(397)	62	(1,440)	(699)
Other comprehensive income (loss), net of tax	597	(94)	2,159	1,045
Net Income	670	874	1,919	1,887
Comprehensive Income	1,267	780	4,078	2,932
Tax Effect Allocated to Each Component of Comprehensive Income
Retirement plan net losses recognized in plan expenses	(31)	(27)	(127)	(80)
Gain on pension plan curtailment	0	0	(768)	0
Unrealized loss on financial derivative	2	28	4	38
Unrealized gains on available-for-sale securities	(368)	61	(549)	(657)
Income tax effect related to other comprehensive income	(397)	62	(1,440)	(699)
Accumulated Other Comprehensive Loss By Component:
Unrealized loss for pension and other postretirement obligations	(3,792)		(3,792)		(6,029)
Tax effect			1,517		2,412
Net unrealized loss for pension and other postretirement obligations	(2,275)		(2,275)		(3,617)
Unrealized loss on financial derivative instruments used in cash flow hedging relationships	(210)		(210)		(200)
Tax effect			84		80
Net unrealized loss on financial derivative instruments used in cash flow hedging relationships	(126)		(126)		(120)
Unrealized gains on available-for-sale securities	3,161		3,161		1,789
Tax effect			(1,265)		(716)
Net unrealized gains on available-for-sale securities	1,896		1,896		1,073
Accumulated other comprehensive loss	$ (505)		$ (505)		$ (2,664)