Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	$ 8,523	$ 4,593	$ 14,210	$ 8,484
Investments in unconsolidated entities	64,077		64,077		$ 55,616
GB Challenger, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	7,019	3,225	11,086	5,975
Investments in unconsolidated entities	43,599		43,599		37,737
Green Brick Mortgage, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	502	545	830	1,633
Investments in unconsolidated entities	1,017		1,017		715
EJB River Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	646	473	1,384	472
Investments in unconsolidated entities	7,514		7,514		6,130
GBTM Sendera, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities		17
Investments in unconsolidated entities	10,981		10,981		9,854
BHome Mortgage, LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	356	333	910	404
Investments in unconsolidated entities	966		966		$ 1,180
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated entities	$ 8,523	$ 4,593	$ 14,210	$ 8,484