Income Taxes (Summary of Tax Years Subject to Examination by Major Taxing Jurisdictions) (Details)	12 Months Ended
	Dec. 31, 2021
Federal [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2018
Federal [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2021
Arkansas [Member] | State and Local [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2018
Arkansas [Member] | State and Local [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2021
Idaho [Member] | State and Local [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2018
Idaho [Member] | State and Local [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2021
Michigan [Member] | State and Local [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2017
Michigan [Member] | State and Local [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2021
Minnesota [Member] | State and Local [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2017
Minnesota [Member] | State and Local [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2021