Interest-bearing Deposits and Securities: Trading Securities Policy (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Sales of Trading Securities	$ 0	$ 0
Other Than Temporary Impairment Charges on Trading Securities	$ 0	$ 0
Trading Securities Nonaccrual Status	0
Trust Preferred Security Nonaccrual		1