Loans - Schedule of Impaired Loans/Allowance for Loan Losses (Details)		3 Months Ended	12 Months Ended
		Mar. 31, 2018 USD ($) Loan	Dec. 31, 2017 USD ($) Loan
Secured Loans Designated as Impaired Loans [Abstract]
Principal		$ 139,162	$ 139,643
Recorded investment	[1]	152,405	151,637
Impaired loans without allowance		$ 152,405	$ 151,637
Number of loans | Loan		1	1

[1] Recorded investment is the sum of the principal, advances, and interest accrued for financial reporting purposes.