Stock-based Compensation	9 Months Ended
Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based Compensation	NOTE 15 - STOCK-BASED COMPENSATION RBB Bancorp 2010 Stock Option Plan Under the RBB Bancorp 2010 Stock Option Plan (the “2010 Plan”), the Company was permitted to grant awards to eligible persons in the form of qualified and non-qualified stock options. The Company reserved up to 30% of the issued and outstanding shares of common stock as of the date the Company adopted the 2010 Plan or 3,494,478 shares, for issuance under the 2010 Plan. After approval of the 2017 Omnibus Stock Incentive Plan (the “OSIP”) at the Company’s annual meeting on May 23, 2017, no additional grants will be made under the 2010 Plan. The 2010 Plan has been terminated and options that were granted under that Plan have become subject to the OSIP. Awards that were granted under the 2010 Plan will remain exercisable pursuant to the terms and conditions set forth in individual award agreements, but such awards will be assumed and administered under the OSIP. The 2010 Plan award agreements allow for acceleration of exercise privileges of grants upon occurrence of a change in control of the Company. If a participant’s job is terminated for cause, then all unvested awards expire at the date of termination. RBB Bancorp 2017 Omnibus Stock Incentive Plan The OSIP was adopted by the Company’s board of directors on January 18, 2017 and approved by the Company’s shareholders at the Company’s annual meeting on May 23, 2017. The OSIP was designed to ensure continued availability of equity awards that will assist the Company in attracting and retaining competent managerial personnel and rewarding key employees, directors and other service providers for high levels of performance. Pursuant to the OSIP, the Company’s board of directors are allowed to grant awards to eligible persons in the form of qualified and non-qualified stock options, restricted stock, restricted stock units, stock appreciation rights and other incentive awards. The Company has reserved up to 30% of issued and outstanding shares of common stock as of the date the Company adopted the OSIP, or 3,848,341 shares. This represents 23% of the issued and outstanding shares of the Company’s common stock as of September 30, 2018. As of September 30, 2018, there were 1,319,782 shares of common stock available for issuance under the OSIP. Awards vest, become exercisable and contain such other terms and conditions as determined by the board of directors and set forth in individual agreements with the employees receiving the awards. The OSIP enables the board of directors to set specific performance criteria that must be met before an award vests. The OSIP allows for acceleration of vesting and exercise privileges of grants if a participant’s termination of employment is due to a change in control, death or total disability. If a participant’s job is terminated for cause, then all awards expire at the date of termination. On August 15, 2018, the Company granted 43,425 shares of restricted stock to Mr. Alan Thian, President and Chief Executive Officer of the Company. The Company recognized stock-based compensation expense of $446,000 and $592,000 and recognized income tax benefits on that expense of $88,000 and $181,000 for the nine months ended September 30, 2018 and 2017, respectively.

NOTE 15 - STOCK-BASED COMPENSATION

RBB Bancorp 2010 Stock Option Plan

Under the RBB Bancorp 2010 Stock Option Plan (the “2010 Plan”), the Company was permitted to grant awards to eligible persons in the form of qualified and non-qualified stock options. The Company reserved up to 30% of the issued and outstanding shares of common stock as of the date the Company adopted the 2010 Plan or 3,494,478 shares, for issuance under the 2010 Plan. After approval of the 2017 Omnibus Stock Incentive Plan (the “OSIP”) at the Company’s annual meeting on May 23, 2017, no additional grants will be made under the 2010 Plan. The 2010 Plan has been terminated and options that were granted under that Plan have become subject to the OSIP. Awards that were granted under the 2010 Plan will remain exercisable pursuant to the terms and conditions set forth in individual award agreements, but such awards will be assumed and administered under the OSIP. The 2010 Plan award agreements allow for acceleration of exercise privileges of grants upon occurrence of a change in control of the Company. If a participant’s job is terminated for cause, then all unvested awards expire at the date of termination.

RBB Bancorp 2017 Omnibus Stock Incentive Plan

The OSIP was adopted by the Company’s board of directors on January 18, 2017 and approved by the Company’s shareholders at the Company’s annual meeting on May 23, 2017. The OSIP was designed to ensure continued availability of equity awards that will assist the Company in attracting and retaining competent managerial personnel and rewarding key employees, directors and other service providers for high levels of performance. Pursuant to the OSIP, the Company’s board of directors are allowed to grant awards to eligible persons in the form of qualified and non-qualified stock options, restricted stock, restricted stock units, stock appreciation rights and other incentive awards. The Company has reserved up to 30% of issued and outstanding shares of common stock as of the date the Company adopted the OSIP, or 3,848,341 shares. This represents 23% of the issued and outstanding shares of the Company’s common stock as of September 30, 2018. As of September 30, 2018, there were 1,319,782 shares of common stock available for issuance under the OSIP. Awards vest, become exercisable and contain such other terms and conditions as determined by the board of directors and set forth in individual agreements with the employees receiving the awards. The OSIP enables the board of directors to set specific performance criteria that must be met before an award vests. The OSIP allows for acceleration of vesting and exercise privileges of grants if a participant’s termination of employment is due to a change in control, death or total disability. If a participant’s job is terminated for cause, then all awards expire at the date of termination.

On August 15, 2018, the Company granted 43,425 shares of restricted stock to Mr. Alan Thian, President and Chief Executive Officer of the Company.

The Company recognized stock-based compensation expense of $446,000 and $592,000 and recognized income tax benefits on that expense of $88,000 and $181,000 for the nine months ended September 30, 2018 and 2017, respectively.