Income Taxes Income Taxes - Effective Income Taxes Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Computed expected tax expense									$ 2,734	$ 2,094	$ 2,241
Tax exempt interest on obligations of state and political subdivisions									(451)	(404)	(371)
Tax exempt interest on bank owned life insurance									(210)	(203)	(199)
New markets tax credit									(208)	(270)	(536)
Other, net									69	(61)	91
Total Income Tax expense	$ 491	$ 538	$ 324	$ 581	$ 329	$ 500	$ 61	$ 266	$ 1,934	$ 1,156	$ 1,226