MSRs - MSR Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Mortgage Service Rights Activity [Line Items]
Balance at beginning of year	$ 0
MSRs related to deconsolidation of securitization trust	0
Changes in fair value due to:
Balance at end of year	555,172,891	$ 0
Mortgage servicing rights
Schedule Of Mortgage Service Rights Activity [Line Items]
Balance at beginning of year	2,963,861	3,440,809
MSRs retained from sales to securitizations	0	10,910
MSRs related to deconsolidation of securitization trust	1,025,129	0
Changes in fair value due to:
Changes in valuation inputs or assumptions used in valuation model	375,016	39,688
Other changes to fair value	(366,220)	(527,546)
Balance at end of year	3,997,786	2,963,861
Loans associated with MSRs	$ 407,332,854	$ 338,167,569
MSR values as percent of loans	0.98%	0.88%