Fair Value Measurements (Unobservable Quantitative Input Ratios) (Details) - Loans Receivable - Level 3	Mar. 31, 2023 ft²	Dec. 31, 2022
Discount rates | Recurring
Unobservable Quantitative Input
Loans receivable, measurement input	0.075	0.075
Discount rates | Nonrecurring | Real Estate Investments | Maximum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.0750
Discount rates | Nonrecurring | Real Estate Investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.0800
Discount rates | Nonrecurring | Real Estate Investments | Weighted Average
Unobservable Quantitative Input
Other real estate owned, measurement input	0.0752
Terminal capitalization rates | Recurring
Unobservable Quantitative Input
Loans receivable, measurement input	0.055	0.055
Terminal capitalization rates | Nonrecurring | Real Estate Investments | Maximum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.0475
Terminal capitalization rates | Nonrecurring | Real Estate Investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input	0.0550
Terminal capitalization rates | Nonrecurring | Real Estate Investments | Weighted Average
Unobservable Quantitative Input
Other real estate owned, measurement input	0.0478