Federal and State Income Taxes (Details 3)	12 Months Ended
	Dec. 31, 2012
Federal [Member]
Income Tax Examination [Line Items]
Income tax return jurisdictions and years that remain subject to examination	2009, 2010 and 2011
Montana [Member]
Income Tax Examination [Line Items]
Income tax return jurisdictions and years that remain subject to examination	2009, 2010 and 2011
Idaho [Member]
Income Tax Examination [Line Items]
Income tax return jurisdictions and years that remain subject to examination	2009, 2010 and 2011
Colorado [Member]
Income Tax Examination [Line Items]
Income tax return jurisdictions and years that remain subject to examination	2008, 2009, 2010 and 2011
Utah [Member]
Income Tax Examination [Line Items]
Income tax return jurisdictions and years that remain subject to examination	2009, 2010 and 2011