MSRs - MSR Activity (Details) - Mortgage Servicing Rights - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Movement in Mortgage Service Rights
Balance at beginning of year	$ 3,440,809	$ 4,268,673
MSRs relating to 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	(50,751)	(102,855)
Other changes to fair value	(406,971)	(1,089,172)
Balance at end of period	2,993,997	3,440,809
Loans associated with MSRs	$ 352,061,683	$ 397,925,409
MSR values as percent of loans	0.85%	0.86%