Fair Value Measurements (Unobservable Quantitative Input Ratios) (Details) - Recurring - Level 3	Mar. 31, 2022	Dec. 31, 2021
Discount Rate | Real estate fund investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.118	0.120
Discount Rate | Real estate fund investments | Maximum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.130	0.150
Discount Rate | Real estate fund investments | Weighted Average
Unobservable Quantitative Input
Other real estate owned, measurement input	0.125	0.132
Terminal Capitalization Rate | Real estate fund investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.055	0.055
Terminal Capitalization Rate | Real estate fund investments | Maximum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.091	0.088
Terminal Capitalization Rate | Real estate fund investments | Weighted Average
Unobservable Quantitative Input
Other real estate owned, measurement input	0.075	0.074
Loans Receivable | Discount Rate
Unobservable Quantitative Input
Loans receivable, measurement input	0.065	0.065
Loans Receivable | Discount Rate | Weighted Average
Unobservable Quantitative Input
Loans receivable, measurement input	0.065	0.065
Loans Receivable | Terminal Capitalization Rate
Unobservable Quantitative Input
Loans receivable, measurement input	0.050	0.050
Loans Receivable | Terminal Capitalization Rate | Weighted Average
Unobservable Quantitative Input
Loans receivable, measurement input	0.050	0.050