Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2008	$ 3,048	$ 12,981	$ 41,034	$ (4,319)	$ 26	$ 52,770
Balance (in shares) at Dec. 31, 2008	3,048,289
Comprehensive income:
Net income			9,864			9,864
Unrealized gain (loss) on securities, net of reclassification and tax					1,435	1,435
Unrealized gain (loss) on interest rate swap, net of tax					117	117
Other comprehensive loss (income) related to pensions plans, net of tax					463	463
Total comprehensive income						11,879
Stock dividend	28	566	(594)			0
Stock dividend (in shares)	27,964
Purchase of treasury stock				(286)		(286)
Restricted stock awards		(147)		147		0
Restricted stock vesting		58		0		58
Stock awards		(1)		58		57
Cash dividends			(2,951)			(2,951)
Balance at Dec. 31, 2009	3,076	13,457	47,353	(4,400)	2,041	61,527
Balance (in shares) at Dec. 31, 2009	3,076,253
Comprehensive income:
Net income			11,502			11,502
Unrealized gain (loss) on securities, net of reclassification and tax					(1,132)	(1,132)
Unrealized gain (loss) on interest rate swap, net of tax					(160)	(160)
Other comprehensive loss (income) related to pensions plans, net of tax					305	305
Total comprehensive income						10,515
Stock dividend	28	733	(761)			0
Stock dividend (in shares)	28,181
Purchase of treasury stock				(386)		(386)
Restricted stock awards		(128)		119		(9)
Restricted stock vesting		154		0		154
Forfeited restricted stock		10		(10)		0
Stock awards		9		42		51
Cash dividends			(3,162)			(3,162)
Balance at Dec. 31, 2010	3,104	14,235	54,932	(4,635)	1,054	68,690
Balance (in shares) at Dec. 31, 2010	3,104,434
Comprehensive income:
Net income			12,832			12,832
Unrealized gain (loss) on securities, net of reclassification and tax					4,475	4,475
Unrealized gain (loss) on interest rate swap, net of tax					40	40
Other comprehensive loss (income) related to pensions plans, net of tax					(620)	(620)
Total comprehensive income						16,727
Stock dividend	29	1,023	(1,052)			0
Stock dividend (in shares)	28,432
Purchase of treasury stock				(851)		(851)
Restricted stock awards		(159)				(159)
Restricted stock vesting		209				209
Cash dividend reinvestment paid from treasury stock		5	(227)	222		0
Cash dividends			(3,148)			(3,148)
Balance at Dec. 31, 2011	$ 3,133	$ 15,313	$ 63,337	$ (5,264)	$ 4,949	$ 81,468
Balance (in shares) at Dec. 31, 2011	3,132,866