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DEBT - Summary of Mortgage Warehouse Borrowings (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Amount Drawn $ 180,833,000 $ 127,289,000
Secured Debt    
Line of Credit Facility [Line Items]    
Amount Drawn 180,833,000 127,289,000
Facility Amount 215,000,000 295,000,000
Mortgage borrowings outstanding, collateralized amount 243,300,000 201,200,000
Collateralized amount of restricted short-term investments 1,000,000.0 1,300,000
Secured Debt | Warehouse A    
Line of Credit Facility [Line Items]    
Amount Drawn 7,114,000 40,958,000
Facility Amount $ 10,000,000 $ 55,000,000
Secured Debt | Warehouse A | LIBOR    
Line of Credit Facility [Line Items]    
Interest Rate 1.75% 1.75%
Secured Debt | Warehouse B    
Line of Credit Facility [Line Items]    
Amount Drawn $ 46,218,000 $ 19,457,000
Facility Amount $ 50,000,000 $ 85,000,000
Secured Debt | Warehouse B | LIBOR    
Line of Credit Facility [Line Items]    
Interest Rate 1.75% 1.75%
Secured Debt | Warehouse C    
Line of Credit Facility [Line Items]    
Amount Drawn $ 71,799,000 $ 43,148,000
Facility Amount $ 75,000,000 $ 75,000,000
Secured Debt | Warehouse C | LIBOR    
Line of Credit Facility [Line Items]    
Interest Rate 2.05% 2.05%
Warehouse D | Secured Debt    
Line of Credit Facility [Line Items]    
Amount Drawn $ 55,702,000 $ 23,726,000
Facility Amount $ 80,000,000 $ 80,000,000
Warehouse D | Secured Debt | LIBOR    
Line of Credit Facility [Line Items]    
Interest Rate 1.65% 1.65%