Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	$ 5,299	$ 3,022	$ 13,038	$ 7,565
GB Challenger, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	3,825	2,572	9,391	6,574
Green Brick Mortgage, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	1,498	340	3,658	668
Providence Group Title
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities		111	14	323
EJB River Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities			(1)
BHome Mortgage, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	(24)		(24)
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	$ 5,299	$ 3,022	$ 13,038	$ 7,565