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]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2009	$ 3,076	$ 13,457	$ 47,353	$ 2,041	$ (4,400)	$ 61,527
Balance (in shares) at Dec. 31, 2009	3,076,253
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			11,502			11,502
Net other comprehensive loss				(987)		(987)
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	1,054	(4,635)	68,690
Balance (in shares) at Dec. 31, 2010	3,104,434
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			12,832			12,832
Net other comprehensive loss				3,895		3,895
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	4,949	(5,264)	81,468
Balance (in shares) at Dec. 31, 2011	3,132,866
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			14,215			14,215
Net other comprehensive loss				(318)		(318)
Comprehensive income						13,897
Stock dividend	28	1,110	(1,138)			0
Stock dividend (in shares)	28,458
Purchase of treasury stock					(1,348)	(1,348)
Restricted stock awards		(156)			14	(142)
Restricted stock vesting		201				201
Cash dividends			(4,601)			(4,601)
Balance at Dec. 31, 2012	$ 3,161	$ 16,468	$ 71,813	$ 4,631	$ (6,598)	$ 89,475
Balance (in shares) at Dec. 31, 2012	3,161,324