Fair Value Measurements (Unobservable Quantitative Input Ratios) (Details) - Loans Receivable - Level 3	Sep. 30, 2023	Dec. 31, 2022 ft²
Discount rates | Recurring
Unobservable Quantitative Input
Loans receivable, measurement input	0.075	0.075
Discount rates | Recurring | Weighted Average
Unobservable Quantitative Input
Loans receivable, measurement input	0.075	0.075
Discount rates | Nonrecurring | Real Estate Investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input		0.0750
Discount rates | Nonrecurring | Real Estate Investments | Maximum
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
Terminal capitalization rates | Recurring | Minimum
Unobservable Quantitative Input
Loans receivable, measurement input	0.055
Terminal capitalization rates | Recurring | Maximum
Unobservable Quantitative Input
Loans receivable, measurement input	0.0625
Terminal capitalization rates | Recurring | Weighted Average
Unobservable Quantitative Input
Loans receivable, measurement input	0.056	0.055
Terminal capitalization rates | Nonrecurring | Real Estate Investments | Minimum
Unobservable Quantitative Input
Other real estate owned, measurement input		0.0475
Terminal capitalization rates | Nonrecurring | Real Estate Investments | Maximum
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