Income Taxes: Schedule of Effective Income Tax Rate Reconciliation Table (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Tax at statutory rate	35.00%	35.00%	35.00%	35.00%
Nontaxable interest and dividends	(1.60%)	(7.10%)	(2.60%)	(7.20%)
Tax credits	(4.70%)	(7.40%)	(7.40%)	(6.60%)
State taxes	0.20%	1.00%	0.30%	1.40%
Other taxes	0.70%	0.60%	0.20%	0.60%
Tax percentage rate	29.60%	22.10%	25.50%	23.20%