Fair Value Measurements (Unobervable Quantitative Input Ratios) (Details) - Recurring - Level 3	Jun. 30, 2020	Dec. 31, 2019
Discount Rate | Real estate fund investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.068	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	0.134	0.093
Terminal Capitalization Rate | Real estate fund investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.055	0.046
Terminal Capitalization Rate | Real estate fund investments | Maximum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.093	0.082
Terminal Capitalization Rate | Real estate fund investments | Weighted Average
Unobservable Quantitative Input
Other real estate owned, measurement input	0.073	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	0.065
Loans Receivable | Discount Rate | Weighted Average
Unobservable Quantitative Input
Loans receivable, measurement input	0.061
Loans Receivable | Terminal Capitalization Rate
Unobservable Quantitative Input
Loans receivable, measurement input	0.050
Loans Receivable | Terminal Capitalization Rate | Weighted Average
Unobservable Quantitative Input
Loans receivable, measurement input	0.050