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8) Fair Value of Financial Instruments: Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Loans Held For Sale    
Fair Value Balance $ 304,030,372 $ 422,772,418
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset And Liability, Range of Inputs minimum 95.00% 99.00%
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset And Liability, Range of Inputs maximum 109.00% 110.00%
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset And Liability, Weighted Average 103.00% 104.00%
Net Derivatives Loan Commitments    
Fair Value Balance $ 10,443,076 $ 10,128,610
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset And Liability, Range of Inputs minimum 61.00% 52.00%
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset And Liability, Range of Inputs maximum 92.00% 92.00%
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset And Liability, Weighted Average 82.00% 81.00%
Fixed maturity securities available for sale    
Fair Value Balance $ 2,191,093 $ 2,201,175