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4) Loans Held For Sale: Schedule of Mortgage Fee Income for Loans Held for Sale (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Interest and Other Income $ 1,993,895 $ 2,097,249 $ 4,698,899 $ 5,679,868
Mortgage fee income 31,664,704 41,597,573 88,833,944 122,086,734
Loans Held For Sale        
Loan fees 7,758,284 15,086,168 21,347,320 33,149,877
Secondary gains 22,315,022 28,667,234 58,633,363 87,307,806
Change in fair value of loan commitments 94,569 (4,833,268) 537,696 (3,677,554)
Change in fair value of loans held for sale (203,623) 1,061,917 4,563,222 1,061,917
Provision for loan loss reserve (293,443) (481,727) (946,556) (1,435,180)
Mortgage fee income $ 31,664,704 $ 41,597,573 $ 88,833,944 $ 122,086,734