Intangible Assets and Mortgage Servicing Rights: Mortgage Servicing Rights Policy (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Mortgage Servicing Rights Impairment Charge	$ 0	$ 0
Mortgage Loans Serviced for Others	780,000,000	660,000,000
Mortgage Servicing Rights Custodial Accounts	$ 4,200,000	$ 3,100,000