Loans Receivable, Net (Narrative) (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) loan payments	Sep. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($)	Sep. 30, 2017 loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming Loans, Accrual Status, Minimum Consecutive Payments	6	90
TDRs included in impaired loans	$ 4,000,000.0	$ 4,000,000.0	$ 4,100,000.0
Financing Receivable, Modifications, Subsequent Default, Aggregate Number of Contracts | loan	1	1		2
Days Past Due to Be Considered In Default		30
Review period to request a new third party appraisal		24 months
Impaired Financing Receivable, Recorded Investment	$ 12,595,869	$ 12,595,869	$ 8,442,306