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Fair Value Measurements - Summary of Carrying Value and Fair Value of Mortgage Facilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Fair Value [Member] | Mortgage Facility Payable to Flagship Bank [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Mortgage facility payable $ 6,872 $ 7,396
Fair Value [Member] | Mortgage Facility Payable to Seacoast National Bank [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Mortgage facility payable 17,529  
Fair Value [Member] | Mortgage Facility Payable to Hancock Whitney Bank [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Mortgage facility payable 27,089  
Carrying Value [Member] | Mortgage Facility Payable to Flagship Bank [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Mortgage facility payable 6,899 $ 7,396
Carrying Value [Member] | Mortgage Facility Payable to Seacoast National Bank [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Mortgage facility payable 17,675  
Carrying Value [Member] | Mortgage Facility Payable to Hancock Whitney Bank [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Mortgage facility payable $ 27,106