v3.22.2.2
Investment in Loans (Schedule of Commercial Loans: Geographic Distribution) (Details) - Geographic Concentration Risk [Member] - Commercial mortgage loans - Financing Receivables, Unpaid Principal Balance [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 100.00% 100.00%
Florida [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 20.80% 32.30%
NEW YORK    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 10.60% 13.50%
NEW JERSEY    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 1.30% 0.00%
CONNECTICUT    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 1.90% 3.50%
MASSACHUSETTS    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 5.40% 5.10%
NORTH CAROLINA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 0.00% 7.00%
MASSACHUSETTS    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 4.80% 0.00%
ARIZONA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 9.30% 9.30%
PENNSYLVANIA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 3.30% 5.90%
Tennessee [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 2.30% 7.70%
ILLINOIS    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 4.10% 0.00%
Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 1.10% 0.00%
OHIO    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 4.00% 7.30%
MICHIGAN    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 4.80% 4.90%
NEW HAMPSHIRE    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 1.90% 3.50%
Texas [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 11.70% 0.00%
GEORGIA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 6.70% 0.00%
OKLAHOMA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 3.60% 0.00%
RHODE ISLAND    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 1.10% 0.00%
LOUISIANA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of Total Outstanding Unpaid Principal Balance 1.30% 0.00%