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Mortgage Servicing Rights: Assumptions used in determining MSR value (Details) - Decimal
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Receivables 12.20 15.60
Held-to-maturity Securities 6 years 6 months 18 days 5 years 3 months 18 days
Discount Rate 9.50 9.50