21) Mortgage Servicing Rights: Assumptions used in determining MSR value (Details) - Decimal	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Text Block [Abstract]
Prepayment Speeds	15.60	15.30
Average Life in Years of MSR	5 years 3 months 19 days	5 years 3 months 8 days
Discount Rate	9.50	9.51