12) Mortgage Servicing Rights: Assumptions used in determining MSR value (Details) - Decimal	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Text Block [Abstract]
Prepayment Speeds	16.7	15.3
Average Life in Years of MSR	5 years 22 days	5 years 3 months 8 days
Discount Rate	9.5	9.51