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DEBT - Summary of Mortgage Warehouse Borrowings (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]      
Amount Drawn   $ 109,593,000 $ 123,233,000
Secured Debt      
Line of Credit Facility [Line Items]      
Amount Drawn   109,593,000 123,233,000
Facility Amount   285,000,000 230,000,000
Mortgage borrowings outstanding, collateralized amount   172,500,000 190,900,000
Collateralized amount of restricted short-term investments   1,100,000 1,600,000
Secured Debt | Warehouse A      
Line of Credit Facility [Line Items]      
Amount Drawn   40,232,000 25,074,000
Facility Amount   $ 55,000,000 45,000,000
Secured Debt | Warehouse A | LIBOR      
Line of Credit Facility [Line Items]      
Interest Rate(1) 1.75% 1.75%  
Secured Debt | Warehouse B      
Line of Credit Facility [Line Items]      
Amount Drawn   $ 30,238,000 38,481,000
Facility Amount   $ 75,000,000 85,000,000
Secured Debt | Warehouse B | LIBOR      
Line of Credit Facility [Line Items]      
Interest Rate(1) 1.75% 2.50%  
Secured Debt | Warehouse C      
Line of Credit Facility [Line Items]      
Amount Drawn   $ 23,731,000 59,678,000
Facility Amount   $ 75,000,000 $ 100,000,000
Secured Debt | Warehouse C | LIBOR      
Line of Credit Facility [Line Items]      
Interest Rate(1) 1.70% 1.70%  
Warehouse D | Secured Debt      
Line of Credit Facility [Line Items]      
Amount Drawn   $ 15,392,000  
Facility Amount   $ 80,000,000  
Warehouse D | Secured Debt | LIBOR      
Line of Credit Facility [Line Items]      
Interest Rate(1)   1.75%