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Fair Value Measurements - Narrative (Details) - USD ($)
9 Months Ended 12 Months Ended
Jun. 08, 2021
Sep. 30, 2021
Dec. 31, 2020
Financial Instruments Not Measured at Fair Value      
Financial liabilities fair value   $ 0  
Financial assets fair value   0  
Real Estate Investment      
Financial Instruments Not Measured at Fair Value      
Sale of derivatives $ 3,000,000    
Impairment charge   $ 520,000  
Level 2 | Market Approach Valuation Technique | Junior subordinated notes      
Financial Instruments Not Measured at Fair Value      
Market interest rate percentage   4.12% 4.22%
Level 2 | Market Approach Valuation Technique | Mortgages payable | Minimum      
Financial Instruments Not Measured at Fair Value      
Market interest rate percentage   3.49% 2.87%
Level 2 | Market Approach Valuation Technique | Mortgages payable | Maximum      
Financial Instruments Not Measured at Fair Value      
Market interest rate percentage   3.87% 3.28%
Carrying and Fair Value | Level 2 | Junior subordinated notes      
Financial Instruments Not Measured at Fair Value      
Estimated fair value (lower) higher than carrying value   $ 8,445,000 $ 8,670,000
Carrying and Fair Value | Level 2 | Mortgages payable      
Financial Instruments Not Measured at Fair Value      
Estimated fair value (lower) higher than carrying value   $ 2,156,000 $ 3,831,000