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Fair Value of Financial Instruments: Schedule of Changes in the consolidated balance sheet line items measured using level 3 inputs (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Derivatives Loan Commitments        
Subsidiary, Sale of Stock [Line Items]        
Fair Value Balance $ 10,443,076 $ 5,766,265 $ 10,128,610 $ 2,491,233
Originations 0 0 0 0
Sales 0 0 0 0
Transfer to mortgage loans held for investment 0 0 0 0
Fair Value, Gains (Losses) included in earnings (482,863) [1] 5,278,100 [2] (168,397) [3] 8,553,132 [4]
Total gains (losses) included in other comprehensive income 0 0 0 0
Fair Value Balance 9,960,213 11,044,365 9,960,213 11,044,365
Loans Held For Sale 1 [Member]        
Subsidiary, Sale of Stock [Line Items]        
Fair Value Balance 304,030,372 281,052,576 422,772,418 213,457,632
Originations 1,360,389,498 1,312,854,438 2,810,230,507 2,105,048,030
Sales (1,410,147,019) (1,278,846,335) (3,025,027,077) (2,017,976,791)
Transfer to mortgage loans held for investment 0 0 (201,951) (8,933,676)
Fair Value, Gains (Losses) included in earnings 42,455,235 [1] 41,889,279 [2] 88,954,189 [3] 65,354,763 [4]
Total gains (losses) included in other comprehensive income 0 0 0 0
Fair Value Balance 296,728,086 356,949,958 296,728,086 356,949,958
Fixed Maturity Securities Available For Sale 1 [Member]        
Subsidiary, Sale of Stock [Line Items]        
Fair Value Balance 2,191,093 3,275,326 2,201,175 3,216,382
Originations 0 0 0 0
Sales (11,300) (1,010,500) (22,400) (1,020,800)
Transfer to mortgage loans held for investment 0 0 0 0
Fair Value, Gains (Losses) included in earnings 908 [5] 844 [6] 1,801 [7] 1,672 [8]
Total gains (losses) included in other comprehensive income 127 (44,278) 252 24,138
Fair Value Balance $ 2,180,828 $ 2,221,392 $ 2,180,828 $ 2,221,392
[1] As a component of Mortgage fee income on the condensed consolidated statements of earnings
[2] As a component of Mortgage fee income on the condensed consolidated statements of earnings
[3] As a component of Mortgage fee income on the condensed consolidated statements of earnings
[4] As a component of Mortgage fee income on the condensed consolidated statements of earnings
[5] As a component of Net investment income on the condensed consolidated statements of earnings
[6] As a component of Net investment income on the condensed consolidated statements of earnings 
[7] As a component of Net investment income on the condensed consolidated statements of earnings
[8] As a component of Net investment income on the condensed consolidated statements of earnings