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Share-Based Compensation Disclosures |  | 12 Months Ended |
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Oct. 27, 2014 shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) non-employee $ / shares shares | Dec. 31, 2016 $ / shares shares
Share-based Payment Arrangement [Abstract] |  |  |  |  |
Share-based Payment Arrangement [Text Block] |  | SHARE-BASED COMPENSATION 2014 Omnibus Equity Incentive Plan On October 17, 2014, the Company’s stockholders approved the Green Brick Partners, Inc. 2014 Omnibus Equity Incentive Plan (the “2014 Equity Plan”). The purpose of the 2014 Equity Plan is to provide a means for the Company to attract and retain key personnel and to provide a means whereby current and prospective directors, officers, employees, consultants and advisors can acquire and maintain an equity interest in the Company, or be paid incentive compensation, which may (but need not) be measured by reference to the value of the Company’s common stock, thereby strengthening their commitment to the welfare of the Company and aligning their interests with those of the Company’s stockholders. The 2014 Equity Plan will terminate automatically on the tenth anniversary of the date it became effective. No awards will be granted under the 2014 Equity Plan after that date, but awards granted prior to that date may extend beyond that date. Under the 2014 Equity Plan, awards of stock options, including both incentive stock options and nonqualified stock options, stock appreciation rights, restricted stock and restricted stock units, other share-based awards and performance compensation awards, may be granted. The maximum number of shares of the Company’s common stock that is authorized and reserved for issuance under the 2014 Equity Plan is 2,350,956 shares, subject to adjustment for certain corporate events or changes in the Company’s capital structure. In general, the Company’s employees or those reasonably expected to become the Company’s employees, consultants and directors, are eligible for awards under the 2014 Equity Plan, provided that incentive stock options may be granted only to employees. The Company has six non-employee directors and approximately 460 employees (including employees of our builders) who are eligible to receive awards under the 2014 Equity Plan. Written agreements between the Company and each participant evidence the terms of each award granted under the 2014 Equity Plan. If any award under the 2014 Equity Plan expires or otherwise terminates, in whole or in part, without having been exercised in full, the common stock withheld from issuance under that award will become available for future issuance under the plan. If shares issued under the 2014 Equity Plan are reacquired by the Company pursuant to the terms of any forfeiture provision, those shares will become available for future awards under the plan. Awards that can only be settled in cash will not be treated as shares of common stock granted for purposes of the 2014 Equity Plan. The maximum amount that can be paid to any single participant in any one calendar year pursuant to a cash bonus award under the 2014 Equity Plan is $2.0 million. As of December 31, 2019, 1,656,703 shares remain available for future grant of awards under the 2014 Equity Plan. Share-Based Award Activity During the year ended December 31, 2019, the Company granted restricted stock awards (“RSAs”) under the 2014 Equity Plan to Executive Officers (“EOs”) and non-employee members of the BOD. The RSAs granted to EOs were 100% vested and non-forfeitable on the grant date. Some members of the BOD elected to defer up to 100% of their annual retainer fee in the form of common stock. The RSAs granted to the BOD will become fully vested on the earlier of (i) the first anniversary of the date of grant of the shares of restricted common stock or (ii) the date of the Company’s 2019 Annual Meeting of Stockholders. The fair value of the RSAs granted to EOs and non-employee members of the BOD were recorded as share-based compensation expense on the grant date and over the vesting period, respectively. During the year ended December 31, 2019, the Company withheld 59,116 shares of common stock from EOs, at a total cost of $0.5 million, to satisfy statutory minimum tax requirements upon grant of the RSAs. A summary of share-based awards activity during the years ended December 31, 2019, 2018 and 2017 is as follows:
| Number of Shares (in thousands) |  | Weighted Average Grant Date Fair Value per Share
Nonvested, December 31, 2016 | 38 |  |  | $ | 7.51 |
Granted | 229 |  |  | $ | 10.11 |
Vested | (229 | ) |  | $ | 9.66 |
Forfeited | — |  |  | $ | — |
Nonvested, December 31, 2017 | 38 |  |  | $ | 10.25 |
Granted | 140 |  |  | $ | 10.45 |
Vested | (144 | ) |  | $ | 10.03 |
Forfeited | — |  |  | $ | — |
Nonvested, December 31, 2018 | 34 |  |  | $ | 12.00 |
Granted | 219 |  |  | $ | 9.14 |
Vested | (194 | ) |  | $ | 9.67 |
Forfeited | — |  |  | $ | — |
Nonvested, December 31, 2019 | 59 |  |  | $ | 9.05 |
Stock Options Stock options granted to date were not granted under the 2014 Equity Plan. The stock options outstanding as of December 31, 2019 vested and became exercisable in five substantially equal installments on each of the first five anniversaries of the grant date and expire 10 years after the date on which they were granted. Compensation expense related to these options was expensed on a straight-line basis over the 5 years year service period. All of the stock options outstanding as of December 31, 2019 are vested. We utilized the Black-Scholes option pricing model for estimating the grant date fair value of the stock options. There were no stock options granted during the years ended December 31, 2019, 2018 and 2017. A summary of stock option activity during the year ended December 31, 2019 is as follows:
| Number of Shares (in thousands) |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Options outstanding, December 31, 2018 | 500 |  |  | $ | 7.49 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Options outstanding, December 31, 2019 | 500 |  |  | $ | 7.49 |  |  | 4.82 |  | $ | 1,995 |
Options exercisable, December 31, 2019 | 500 |  |  | $ | 7.49 |  |  | 4.82 |  | $ | 1,995 |
A summary of unvested stock option activity during the year ended December 31, 2019 is as follows:
| Number of Shares (in thousands) |  | Weighted Average Per Share Grant Date Fair Value
Unvested, December 31, 2018 | 100 |  |  | $ | 2.88 |
Granted | — |  |  | $ | — |
Vested | (100 | ) |  | $ | 2.88 |
Forfeited | — |  |  | $ | — |
Unvested, December 31, 2019 | — |  |  | $ | 2.88 |
Share-Based Compensation Expense Share-based compensation expense was $2.2 million, $1.8 million and $2.6 million for the years ended 2019, 2018 and 2017, respectively. Recognized tax benefit related to share-based compensation expense was $0.5 million, $0.4 million and $0.6 million for the years ended December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, the estimated total remaining unamortized share-based compensation expense related to unvested RSAs, net of forfeitures, was $0.2 million which is expected to be recognized over a weighted-average period of 0.4 years. The total fair value of RSAs vested during the years ended December 31, 2019, 2018 and 2017 was $1.9 million, $1.4 million and $2.2 million, respectively. As of December 31, 2019, there was no remaining unamortized share-based compensation expense related to stock options. |  |  |
Summary of Stock Option Activity |  | A summary of stock option activity during the year ended December 31, 2019 is as follows:
| Number of Shares (in thousands) |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Options outstanding, December 31, 2018 | 500 |  |  | $ | 7.49 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Options outstanding, December 31, 2019 | 500 |  |  | $ | 7.49 |  |  | 4.82 |  | $ | 1,995 |
Options exercisable, December 31, 2019 | 500 |  |  | $ | 7.49 |  |  | 4.82 |  | $ | 1,995 |
A summary of unvested stock option activity during the year ended December 31, 2019 is as follows:
| Number of Shares (in thousands) |  | Weighted Average Per Share Grant Date Fair Value
Unvested, December 31, 2018 | 100 |  |  | $ | 2.88 |
Granted | — |  |  | $ | — |
Vested | (100 | ) |  | $ | 2.88 |
Forfeited | — |  |  | $ | — |
Unvested, December 31, 2019 | — |  |  | $ | 2.88 |
Schedule of Share-based Compensation, Activity |  | A summary of share-based awards activity during the years ended December 31, 2019, 2018 and 2017 is as follows:
| Number of Shares (in thousands) |  | Weighted Average Grant Date Fair Value per Share
Nonvested, December 31, 2016 | 38 |  |  | $ | 7.51 |
Granted | 229 |  |  | $ | 10.11 |
Vested | (229 | ) |  | $ | 9.66 |
Forfeited | — |  |  | $ | — |
Nonvested, December 31, 2017 | 38 |  |  | $ | 10.25 |
Granted | 140 |  |  | $ | 10.45 |
Vested | (144 | ) |  | $ | 10.03 |
Forfeited | — |  |  | $ | — |
Nonvested, December 31, 2018 | 34 |  |  | $ | 12.00 |
Granted | 219 |  |  | $ | 9.14 |
Vested | (194 | ) |  | $ | 9.67 |
Forfeited | — |  |  | $ | — |
Nonvested, December 31, 2019 | 59 |  |  | $ | 9.05 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 0 |  |  |
Exercised (in dollars per share) | $ / shares |  | 0 |  |  |
Forfeited (in dollars per share) | $ / shares |  | $ 0 |  |  |
Options exercisable, aggregate intrinsic value | $ |  | $ 1,995,000 |  |  |
Options exercisable (in dollars per share) | $ / shares |  | $ 7.49 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Options outstanding, beginning balance (in shares) |  | 500,000 |  |  |
Exercised (in shares) |  | 0 |  |  |
Forfeited (in shares) |  | 0 |  |  |
Options outstanding, ending balance (in shares) |  | 500,000 | 500,000 |  |
Options exercisable (in shares) |  | 500,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Unvested, beginning balance (in dollars per share) | $ / shares |  | $ 2.88 |  |  |
Granted (in dollars per share) | $ / shares |  | 0 |  |  |
Vested (in dollars per share) | $ / shares |  | 2.88 |  |  |
Forfeited (in dollars per share) | $ / shares |  | 0 |  |  |
Unvested, ending balance (in dollars per share) | $ / shares |  | $ 2.88 | $ 2.88 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Unvested, beginning balance (in shares) |  | 100,000 |  |  |
Granted (in shares) |  | 0 |  |  |
Vested (in shares) |  | (100,000) |  |  |
Forfeited (in shares) |  | 0 |  |  |
Unvested, ending balance (in shares) |  | 0 | 100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options outstanding, weighted average remaining life (in years) |  | 4 years 9 months 25 days |  |  |
Options exercisable, weighted average remaining life (in years) |  | 4 years 9 months 25 days |  |  |
Options outstanding, aggregate intrinsic value | $ |  | $ 1,995,000 |  |  |
Share-based compensation expense | $ |  | 2,191,000 | $ 1,774,000 | $ 2,571,000 |
Share-based Payment Arrangement, Expense, Tax Benefit | $ |  | $ (500,000) | (400,000) | (600,000) |
Number of shares authorized and reserved for issuance | 2,350,956 |  |  |  |
Maximum amount to be paid to individual pursuant to cash bonus award | $ |  |  |  | 2,000,000.0 |
Document Period End Date |  | Dec. 31, 2019 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ |  | $ 1,900,000 | $ 1,400,000 | $ 2,200,000 |
Share-based Payment Arrangement, Expense | $ |  | $ 2,200,000 |  |  |
Number of shares available for grant |  |  |  | 1,656,703 |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (59,116) | (39,228) | (63,057) |
Shares granted |  | 0 |  |  |
Per share exercise price | $ / shares |  | $ 7.49 | $ 7.49 |  |
Expiration period (in years) | 10 years |  |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement | $ |  | $ (544,000) | $ (412,000) | $ (586,000) |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | $ |  | $ 544,000 | $ 412,000 | $ 586,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 59,000 | 34,000 | 38,000 | 38,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares |  | $ 9.05 | $ 12.00 | $ 10.25 | $ 7.51
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 9.14 | $ 10.45 | $ 10.11 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 219,000 | 140,000 | 229,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | (194,000) | (144,000) | (229,000) |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 9.67 | $ 10.03 | $ 9.66 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  | 0 | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares |  | $ 0 | $ 0 | $ 0 |
Non-employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number eligible for awards | non-employee |  |  |  | 6 |
Percentage of amount of retainer fee deferred (up to) |  |  |  | 100.00% |
Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | $ |  | $ (1,000) | $ 0 | $ (1,000) |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Service period |  |  |  | 5 years |
Stock Issued During Period, Value, Stock Options Exercised | $ |  |  |  | $ 0 |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unamortized share-based compensation expense | $ |  | $ 200,000 |  |  |
Unamortized share-based compensation expense, weighted average period of recognition |  | 4 months 24 days |  |  |
Restricted Stock [Member] | Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of awards vested in period |  |  |  | 100.00% |

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