MSRs - Components of Servicing Income (Details) - Mortgages - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Components Of Servicing Income [Line Items]
Servicing income, net	$ 922,094	$ 932,425	$ 211,878
Income from MSRs, net	$ 922,094	$ 932,425	$ 211,878