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8): Fair Value of Financial Instruments: Schedule of Changes in the consolidated balance sheet line items measured using level 3 inputs (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Loan Commitments    
Fair Value Balance $ 1,996,589 $ 6,809,332
Fair Value, Losses (Gains) included in earnings 537,696 (4,812,743)
Fair Value Balance 2,534,285 1,996,589
Fair Value, Losses (Gains) included in other comprehensive income   0
Loans Held For Sale    
Fair Value Balance 133,414,188 0
Fair Value, Originations 1,692,673,286 1,233,683,666
Fair Value, Sales (1,719,346,884) (1,151,031,388)
Fair Value, Transfer to mortgage loans held for investment (139,464)  
Fair Value, Losses (Gains) included in earnings 58,906,268 50,761,910
Fair Value Balance 165,507,394 133,414,188
Fair Value, Losses (Gains) included in other comprehensive income   0
Bank Loan Interest Rate Swaps    
Fair Value Balance $ 0 (3,308)
Fair Value, Losses (Gains) included in earnings   0
Fair Value Balance   0
Fair Value, Losses (Gains) included in other comprehensive income   $ 3,308