Fair Value Measurements (Unobervable Quantitative Input Ratios) (Details) - Recurring - Level 3	Mar. 31, 2020	Dec. 31, 2019
Discount Rate | Real estate fund investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.100	0.082
Discount Rate | Real estate fund investments | Maximum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.150	0.120
Discount Rate | Real estate fund investments | Weighted Average
Unobservable Quantitative Input
Other real estate owned, measurement input	0.138	0.093
Cap Rate | Minimum
Unobservable Quantitative Input
Loans receivable, measurement input	0.050
Cap Rate | Maximum
Unobservable Quantitative Input
Loans receivable, measurement input	0.060
Cap Rate | Real estate fund investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.060	0.046
Cap Rate | Real estate fund investments | Maximum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.099	0.082
Cap Rate | Real estate fund investments | Weighted Average
Unobservable Quantitative Input
Other real estate owned, measurement input	0.076	0.053
Loans Receivable | Discount Rate | Minimum
Unobservable Quantitative Input
Loans receivable, measurement input	0.060
Loans Receivable | Discount Rate | Maximum
Unobservable Quantitative Input
Loans receivable, measurement input	0.140
Loans Receivable | Discount Rate | Weighted Average
Unobservable Quantitative Input
Loans receivable, measurement input	0.070
Loans Receivable | Cap Rate | Weighted Average
Unobservable Quantitative Input
Loans receivable, measurement input	0.051