MSRs - MSR Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Mortgage Service Rights Activity [Line Items]
Balance at beginning of year	$ 2,849,981
MSRs related to deconsolidation of securitization trust	0
Changes in fair value due to:
Balance at end of period	0	$ 2,849,981
Mortgage servicing rights
Schedule Of Mortgage Service Rights Activity [Line Items]
Balance at beginning of year	3,440,809	4,268,673
MSRs retained from sales to securitizations	10,910	0
MSRs related to deconsolidation of securitization trust	0	364,163
Changes in fair value due to:
Changes in valuation inputs or assumptions used in valuation model	39,688	(102,855)
Other changes to fair value	(527,546)	(1,089,172)
Balance at end of period	2,963,861	3,440,809
Loans associated with MSRs	$ 338,167,569	$ 397,925,409
MSR values as percent of loans	0.88%	0.86%