Document And Entity Information	12 Months Ended
	Dec. 31, 2021 employee	Feb. 25, 2022 shares	Jun. 30, 2021 USD ($)
Entity Information [Line Items]
Entity Incorporation, State or Country Code	DE
Document Transition Report	false
Document Quarterly Report	true
Entity Number of Employees | employee	540
Entity Registrant Name	Green Brick Partners, Inc.
Entity Central Index Key	0001373670
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity File Number	001-33530
Entity Tax Identification Number	20-5952523
City Area Code	(469)
Local Phone Number	573-6755
Entity Address, Address Line One	2805 Dallas Pkwy
Entity Address, Address Line Two	Ste 400
Entity Address, City or Town	Plano
Entity Address, Postal Zip Code	75093
Entity Address, State or Province	TX
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Shell Company	false
Entity Public Float | $			$ 703,959,338
Entity Common Stock, Shares Outstanding | shares		50,759,972
Entity Small Business	false
Auditor Location	Dallas, Texas
Auditor Name	RSM US LLP
ICFR Auditor Attestation Flag	true
Auditor Firm ID	49
Current Fiscal Year End Date	--12-31
Series A Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares (each representing a 1/1000th interest in a share of 5.75% Series A Cumulative Perpetual Preferred Stock, par value $0.01 per share)
Trading Symbol	GRBK PRA
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	GRBK
Security Exchange Name	NYSE
Preferred Stock
Entity Information [Line Items]
Security Exchange Name	NYSE