Document:

EX-10.5

 Exhibit 10.5 

EMPLOYMENT AGREEMENT 

THIS AGREEMENT (“Agreement”) is made and entered into on the 5th day of June, 2015, to be effective on the date
provided herein (the “Effective Date”), by and among ATLANTIC CAPITAL BANCSHARES, INC., a Georgia corporation (the “Holding Company”); ATLANTIC CAPITAL BANK, a wholly-owned banking subsidiary of the Holding Company
(the “Bank”) (collectively, “Employers”); and D. MICHAEL KRAMER (“Executive”). 

WITNESSETH: 

WHEREAS, the Boards of Directors (“Boards”) of Employers consider the establishment and maintenance of highly
competent and skilled management personnel for the Bank and the Holding Company to be essential to protect and enhance their best interests, and are desirous of inducing Executive to become and remain in the employ of the Holding Company and the
Bank, subject to the Agreement’s terms and conditions; 
 WHEREAS, Executive desires to become employed with and remain
employed by the Employers, subject to the Agreement’s terms and conditions; and 
 WHEREAS, the parties agree that the
provisions of this Agreement shall control with respect to the parties’ rights and obligations resulting from Executive’s employment with Employers. 

NOW, THEREFORE, for and in consideration of the Agreement’s mutual covenants, and other good and valuable consideration, the
receipt and legal sufficiency of which are hereby acknowledged, the parties agree as follows: 
 1. Definitions. The following
terms used in this Agreement shall have the following meanings: 
 (a) “Base Salary” shall mean the
annual compensation (excluding Incentive Compensation as defined in (e) of this Agreement paragraph 1 and other benefits) payable to Executive pursuant to Agreement paragraph 4(a). 

(b) “Change of Control” shall be deemed to have occurred: 

(i) Upon the consummation of any transaction in which any person, partnership, financial institution, corporation, other
organization or group, acting alone or in concert, shall own, control, or hold with the power to vote more than forty percent (40%) of any class of voting securities of the Bank or the Holding Company; provided, however, that
“Change of Control” shall not include the purchase by underwriters of voting securities of the Bank or the Holding Company pursuant to a bona fide underwritten public offering of such securities. 

(ii) Upon the consummation of any transaction in which the Holding Company, or substantially all of the assets of the Holding
Company, shall be sold or transferred to, or consolidated or merged with, another financial institution, 

 
corporation or other organization; provided, however, if the Bank shall become a subsidiary of a corporation or other organization or shall be merged or consolidated into another corporation or
organization, and a majority of the outstanding voting shares of the parent or surviving corporation are owned immediately after such acquisition, merger, or consolidation by the owners of a majority of the voting shares of the Bank immediately
before such acquisition, merger, or consolidation, in substantially the same proportion as their ownership of such voting shares immediately prior to such acquisition, merger or consolidation, then no Change of Control shall be deemed to have
occurred; or 
 (iii) If, within any twelve-month period (beginning on or after the Effective Date) the persons who were
Employers’ directors immediately before the beginning of such twelve-month period (the “Incumbent Directors”) shall cease to constitute at least a majority of the Board of Directors; provided that any director who was not a
director as of the beginning of such twelve-month period shall be deemed to be an Incumbent Director if that director were elected to the Board of Directors by, or on the recommendation of or with the approval of, at least two-thirds (2/3) of
the directors who then qualified as Incumbent Directors; and provided further that no director whose initial assumption of office is in connection with an actual or threatened election contest relating to the election of directors shall be deemed to
be an Incumbent Director. 
 (c) “Disability” shall mean a condition for which benefits would be
payable under any long-term disability insurance coverage (without regard to the application of any elimination period requirement) then provided to Executive by the Employers; or, if no such coverage is then being provided, the inability of
Executive to perform the material aspects of Executive’s duties under this Agreement with reasonable accommodation for a period of at least ninety (90) substantially consecutive days, as determined by an independent physician selected with
the approval of the Employers and Executive. 
 (d) “Event of Termination” shall mean the Executive’s
termination of employment under this Agreement for Good Reason or the Employers’ termination of Executive’s employment under this Agreement by written notice delivered to Executive for any reason other than Termination for Cause as defined
in Agreement paragraph (g) or termination following a continuous period of disability exceeding twelve (12) calendar months pursuant to Agreement paragraph 6(a). 

(e) “Good Reason” shall mean if, (1) during the term of Executive’s employment under this Agreement,
the status, character, capacity, location, or circumstances of Executive’s employment as provided in paragraphs 2, 3, 4, 5, and 6 of this Agreement have been materially and adversely altered by the Employers, whether by 

(i) any material breach of this Agreement by the Employers (including the failure of Employers to comply with paragraphs 2, 3,
4, and 5 of this Agreement but not including a reduction in Executive’s Base Salary in connection with a proportionate reduction in the base salaries of all other senior executives); 

  
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 (ii) any material and adverse change in the title, reporting relationship(s), or
responsibilities of Executive; 
 (iii) any assignment of duties materially and adversely inconsistent with Executive’s
position and duties described in this Agreement; 
 (iv) the failure of the Employers to assign this Agreement to a successor
in interest or the failure of the successor in interest to explicitly assume and agree to be bound by this Agreement; or 

(v) the failure of the Executive to be elected or re-elected to the Employers’ Board of Directors. 

Notwithstanding the foregoing, no event shall constitute Good Reason unless the Executive notifies the Employers’ Board of Directors in
writing regarding the existence of the condition(s) constituting Good Reason no later than thirty days after Executive knows of the condition(s) and the Employers do not cure said condition within thirty days after their receipt of the
Executive’s written notice. 
 (f) “Incentive Compensation” shall mean an annual bonus payable to
Executive pursuant to Agreement paragraphs 4(b). 
 (g) “Termination for Cause” shall have the meaning
provided in Agreement paragraph 6(a). 
 2. Employment. The Employers agree to employ Executive, and Executive agrees to accept such
employment, as President and Chief Operating Officer, for the period stated in Agreement paragraph 3(a) (unless earlier terminated as set forth in this Agreement) and upon the other Agreement terms and conditions. Executive agrees to perform
faithfully such duties, responsibilities, and authorities as are customary for the President and Chief Operating Officer of businesses of similar size and businesses as the Employers and as the Chief Executive Officer and Boards may assign to him
from time to time. At all times, Executive shall manage and conduct the business of the Employers in accordance with the policies established by the Boards and in compliance with applicable laws and regulations promulgated by governing regulatory
agencies or authorities. Executive shall report to the Chief Executive Officer of the Employers, and responsibility for the supervision of Executive shall rest with the Chief Executive Officer of the Employers, who shall review Executive’s
performance at least annually. The Chief Executive Officer of the Employers shall also have the authority to terminate Executive, subject to the provisions outlined in Agreement paragraphs 6 and 7. 

3. Term and Duties. 

(a) Term of Employment. This Agreement and the period of Executive’s employment under this Agreement shall be
deemed to have commenced as of the Effective Date and shall continue for a period of thirty-six (36) full calendar months (the 

  
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“Initial Term”), unless earlier terminated pursuant to Agreement paragraph 7 or unless Executive dies before the end of such period, in which case the period of employment shall
be deemed to continue until the end of the month of such death. If the Agreement is in effect at the end of the Initial Term, the period of employment shall be renewed automatically for successive twelve-month periods unless and until one party
gives written notice to the other of its or the Executive’s intent not to extend this Agreement with such written notice to be given not less than ninety (90) days prior to the end of the Initial Term or any such twelve-month period (the
Initial Term and any twelve-month extension thereof is referred to herein as the “Employment Term”). 
 (b)
Performance of Duties. During the period of employment under this Agreement, except for periods of illness, disability, reasonable vacation periods, and reasonable leaves of absence, all subject to policies generally applicable to senior
executives, Executive shall devote substantially all of his business time, attention, skill, and efforts to the faithful performance of his Agreement duties. Executive shall be eligible to participate as a member in community, civic, religious, or
similar organizations, and may pursue personal investments which do not present any material conflict of interest with the Employers, or unfavorably affect the performance of Executive’s duties pursuant to this Agreement. 

(c) Office of Executive. The office of Executive shall be located at the Bank’s office in Chattanooga, TN, or at
such other location within thirty (30) miles of such office, as the Employers may from time to time designate. 
 (d)
No Other Agreement. Executive shall have no employment contract or other written or oral agreement concerning employment with any organization, entity or person other than the Employers during the term of his employment under this Agreement,
except for such arrangements as the Employers shall pre-approve in writing. 
 4. Compensation. 

(a) Salary. Subject to the provisions of Agreement paragraphs 6 and 7, the Employers shall pay Executive, as
compensation for serving as President and Chief Operating Officer, an initial Base Salary of $385,000 per year; such initial Base Salary, or any increased Base Salary, shall be payable in substantially equal installments in accordance with the
Employers’ normal pay practices, but not less frequently than monthly. Executive’s Base Salary and any Incentive Compensation (an annual bonus as defined in Agreement paragraph 4(b)) shall be reviewed and approved at least annually by the
Employers’ Boards of Directors. The Boards of Directors, if warranted in their sole discretion, may increase Executive’s Base Salary to reflect Executive’s performance. The Boards of Directors, if warranted in their sole discretion,
may not decrease Executive’s Base Salary unless all senior executives’ Base Salary is decreased. 
 (b)
Incentive Compensation. Executive shall be eligible to participate in an annual bonus plan, similar to that offered to other executives, with award opportunities approved from year to year by the Boards. Threshold, target, and superior
corporate performance levels shall be established by the Boards from year to year based on certain 

  
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earnings growth, profitability, and asset quality metrics and shall be outlined in the specific award agreement or plan document. For the initial period of participation by Executive in the
Short-Term Incentive Plan and Long-Term Incentive Plan of Employers, Executive shall participate at a target level equal to 45% of Base Salary, with a maximum payment equal to 187.5% of the target level. Specific bonus criteria may change in the
future. Entitlement to and payment of an annual bonus is subject to the discretion and approval of the Boards. Notwithstanding the foregoing, Executive shall receive an incentive compensation payment for 2015 of not less than $100,000 under the
Short-Term Incentive Plan. 
 (c) Stock Option Awards. Executive will be eligible to participate in any stock option
plan, restricted stock or long term incentive plans offered by Employers similar to that offered to other senior executives. As soon as practicable following the Effective Date, Executive shall be granted options to purchase 100,000 shares of the
Holding Company common stock at the current fair market value of the shares for a term of ten years that first become exercisable on the fifth anniversary of the date of grant, and shall be awarded 14,000 restricted shares of the Holding Company
common stock that become vested on the third anniversary of the date of the award. 
 (d) Reimbursement of Expenses;
Provision of Business Development Expenses. Subject to Agreement paragraph 7(e), the Employers shall pay or reimburse Executive for all reasonable travel and entertainment expenses incurred by Executive in the performance of his obligations and
duties under this Agreement, as provided in the Employers’ policies and procedures, and as the Employers’ Boards of Directors have adopted or may adopt in the future. 

(e) Membership on Employers’ Boards of Directors. Subject to an annual election for membership on the
Employers’ Boards of Directors, Executive shall serve on the Boards of Directors of the Employers. 
 (f) Resignation
from the Board of Directors. If Executive’s employment with the Employers is terminated for any reason, or if Executive resigns from his Employers employment for any reason, then Executive agrees that he shall tender his resignation from
the Boards of Directors of the Employers and any company affiliated with the Employers on which Executive serves as a director at the time of his employment termination or resignation. The decision whether to accept such resignation shall be within
the sole discretion of the Board of Directors of the Employers and any such affiliated company. 
 5. Participation in Benefit Plans.

 (a) Incentive, Savings, and Retirement Plans. During the term of Executive’s employment under this Agreement,
Executive shall be entitled to participate in all incentive, stock option, stock appreciation, restricted stock, savings, and retirement plans, practices, policies, and programs applicable generally to senior executive officers of the Employers, on
the same basis as such other senior executive officers, unless otherwise prohibited by the terms of such plans. 

  
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 (b) Health and Welfare Benefit Plans. During the term of Executive’s
employment under this Agreement, Executive and/or Executive’s family, as the case may be, shall be eligible for participation in and shall receive all benefits under any health and welfare benefit plans, practices, policies and programs
provided by the Employers, to the extent applicable generally to senior executive officers of the Employers and subject to the terms, conditions, and eligibility requirements therefore as may be prescribed by the Employers from time to time. 

(c) Vacation and Sick Leave. Executive shall be entitled, without loss of pay, to be voluntarily absent from work or the
performance of his work duties under this Agreement as recited below, all voluntary absences to count as vacation time, provided that: 

(i) Executive shall be entitled to not less than 4 weeks of annual paid vacation or the amount of vacation in accordance with
the policies that the Boards of Directors of the Employers periodically establish for senior management employees of the Employers. 

(ii) Executive shall not receive any additional compensation from the Employers on account of his failure to take a vacation,
and Executive shall not accumulate unused vacation from one fiscal year to the next, except as authorized by the Employers’ Boards of Directors. 

(iii) In addition to paid vacations under this Agreement, Executive shall be entitled, without loss of pay, to be voluntarily
absent from work under this Agreement for such additional periods of time and for such valid and legitimate reasons as the Boards of Directors of the Employers may in their discretion approve. It is also provided that the Boards of Directors of the
Employers may grant to Executive a leave or leaves of absence, with or without pay, at such time or times and upon such terms and conditions as the Boards of Directors of the Employers in their discretion determine. 

(iv) Executive shall be further entitled to an annual sick leave benefit as may be established by the Boards of Directors of
the Employers. 
 6. Benefits Payable Upon Disability. 

(a) Disability Benefits. In the event of the Disability of Executive, the Employers shall continue to pay Executive 100%
of Executive’s then current Base Salary pursuant to paragraph 4(a) during the first twelve (12) months of a substantially continuous period of Disability. It is provided, however, that in the event Executive is disabled for a substantially
continuous period exceeding twelve (12) months, the Employers may, at their election, terminate this Agreement, in which event payment of Executive’s Base Salary shall cease. 

  
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 (b) Disability Benefit Offset. Any amounts payable under Agreement
paragraph 6(a) shall be reduced by any amounts paid to Executive under any other disability program or policy of insurance maintained by the Employers. 

7. Payments to Executive Upon Termination of Employment. The Boards of Directors of the Employers may terminate Executive’s
employment under this Agreement at any time, but any termination other than Termination for Cause shall not prejudice Executive’s right to compensation or other benefits under this Agreement. Executive may voluntarily terminate his employment
under this Agreement. The rights and obligations of the Employers and Executive in the event of employment termination are set forth in this Agreement paragraph 7 as follows: 

(a) Termination for Cause. Following the Executive’s termination for Cause, the Employers shall pay the Executive
any accrued but unpaid Base Salary through the date of termination of Executive’s employment and any earned but unpaid cash bonuses for any prior period. Executive shall have no right to other compensation or benefits (except for vested
benefits under any employee benefit plan and any right to continued health coverage under COBRA or similar state law) for any period after a Termination for Cause, and all outstanding, unvested equity and shares/units associated with outstanding
performance cycles and all options will be cancelled. For purposes of this Agreement, Termination for Cause which shall be determined by the Employers’ Boards of Directors, in the reasonable exercise of its discretion and acting in good faith,
is a termination of Executive’s employment as a result of Executive’s dishonesty, willful misconduct, incarceration for ten or more days, breach of fiduciary duties; intentional failure to perform his job duties; willful violation of any
law (other than minor traffic violations or less serious offenses), or a final cease-and-desist order; the regulatory suspension or removal of Executive as defined in Agreement paragraphs 8(a) and 8(b); Executive’s failure or refusal to follow
instructions of the President and Chief Executive Officer or the Boards of Directors of the Employers; or Executive’s material breach of any provision of this Agreement. The termination of Executive’s employment shall not be a Termination
for Cause unless and until there shall have been delivered to Executive a copy of a resolution duly adopted in good faith by the affirmative vote of not less than two-thirds of the membership of the Employers’ Boards of Directors at a meeting
of the Boards called and held for such purpose (after at least fifteen (15) days prior written notice of such meeting and the Executive’s alleged improper conduct is communicated to Executive and Executive is given an opportunity to be
heard before the Boards of Directors), finding that Executive is guilty of the conduct described as Termination for Cause and specifying in detail the grounds for its decision, and further that the specified conduct remains uncured or was not
capable of cure. The Employers’ Boards of Directors, in their discretion, may place Executive on a paid leave of absence for all or any portion of the period of time from the delivery of the written notice described in this Agreement until the
effective date of the Termination for Cause, or the date on which Executive returns to work from a paid leave of absence. 

(b) Event of Termination Without Change of Control. Upon the occurrence of an Event of Termination, other than for Cause
as provided in paragraph 7(a) or after a Change of Control as provided in Agreement paragraph 7(c), and if Executive faithfully 

  
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and fully abides by all of the covenants contained in Agreement paragraph 9, the Employers shall pay to Executive, or in the event of his subsequent death, to his designated beneficiary or
beneficiaries, or to his estate, as the case may be, as liquidated damages, in lieu of all other claims, any accrued but unpaid Base Salary through the date of termination of Executive’s employment, any earned but unpaid cash bonuses for any
prior period, and equity, including long term incentive performance plans, governed in accordance with the terms of the award agreement. In addition, Employers shall pay Executive a severance payment equal to Executive’s Base Salary plus Target
Bonus with (i) the then-current Base Salary Component of said Severance Payment to be paid in equal monthly installments (each in the amount of the current annual Base Salary divided by 12) and in accordance with Employers’ regular payroll
practices, for the greater of twelve (12) months following the date of said Event of Termination or the balance of the Employment Term then in effect (“Severance Period”) and (ii) any Incentive Compensation component of said
severance payment to be paid in a lump sum within thirty (30) days after expiration of the Severance Period. In addition, the Employers shall reimburse an amount equal to the Employers’ portion of the health insurance premiums then paid
for active employees for the level of coverage elected by the Executive pursuant to COBRA until the earlier of the expiration of the Severance Period or the date on which Executive receives substantially comparable coverage and benefits under the
group health plans of a subsequent employer. In return for the severance payment described in this Agreement paragraph 7(b), Executive shall agree to execute a full release and waiver (substantially similar to the Release and Waiver attached hereto
as Exhibit “A” and made a part of this Agreement) of all known or unknown claims or causes of action Executive has, had, or may have against the Employers, except that such release shall not apply to (i) any rights of the Executive to
indemnification under the Employers’ Certificate of Incorporation or By-Laws or written agreement or to directors’ and officers’ liability insurance coverage of the Employers and its affiliates, (ii) any rights to the severance
pay or benefits under this Agreement, (iii) any rights to vested tax-qualified retirement benefits, and (iv) any rights to continued group health coverage under COBRA or applicable state law. The severance payments described in clause
(i) above shall commence within 60 days following the Executive’s termination of employment provided the Executive has executed the release and the release has become irrevocable before then. If the 60-day period described in the
immediately preceding sentence begins in one calendar year and ends in a later calendar year, the payments shall commence in the later calendar year even if the Executive executes the release and it becomes irrevocable in the earlier calendar year.
If the Executive does not execute the release and the release does not become irrevocable before the 60th day after the Executive’s termination of employment, the Executive shall not receive the severance payment described in this Agreement
paragraph 7(b). 
 (c) Event of Termination in Connection With a Change of Control. If, during the term of
Executive’s employment under this Agreement and within eighteen (18) months immediately following a Change of Control or within three months immediately prior to such Change of Control, Executive’s employment with the Employers under
this Agreement is terminated by an Event of Termination and if Executive faithfully and fully abides by all of the covenants contained in this Agreement paragraph 9, then the Employers shall pay to Executive, or in the event of his subsequent death,
to his 

  
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designated beneficiary or beneficiaries, or to his estate, as the case may be, as liquidated damages, in lieu of all other claims and payments under this Agreement, a severance payment equal to
2.25 times the sum of Executive’s Base Salary plus Target Bonus (equal to his Base Salary multiplied by his annual incentive Target Bonus percentage, each as then in effect), pro-rated over a period of thirty (30) months following the date
of said Event of Termination and paid in accordance with Employers’ regular payroll practices. In addition, the Employers shall reimburse an amount equal to the Employers’ portion of the health insurance premiums then paid for active
employees for the level of coverage elected by the Executive pursuant to COBRA until the earlier of the expiration of the twelve (12) month period following the Event of Termination or the date on which Executive receives substantially
comparable coverage and benefits under the group health plans of a subsequent employer. In return for the severance payment described in this Agreement paragraph 7(c), Executive shall agree to execute a full release and waiver (substantially similar
to the Release and Waiver attached hereto as Exhibit “A” and made a part of this Agreement) of all known or unknown claims or causes of action Executive has, had, or may have against the Employers, except that such release shall not apply
to (i) any rights of the Executive to indemnification under the Employers’ Certificate of Incorporation or By-Laws or written agreement or to directors’ and officers’ liability insurance coverage of the Employers and its
affiliates, (ii) any rights to the severance pay or benefits under this Agreement, (iii) any rights to vested tax-qualified retirement benefits, and (iv) any rights to continued group health coverage under COBRA or applicable state
law. The severance payments described in clause (i) above shall commence within 60 days following the Executive’s termination of employment provided the Executive has executed the release and the release has become irrevocable before then.
If the 60-day period described in the immediately preceding sentence begins in one calendar year and ends in a later calendar year, the payments shall commence in the later calendar year even if the Executive executes the release and it becomes
irrevocable in the earlier calendar year. If the Executive does not execute the release and the release does not become irrevocable before the 60th day after the Executive’s termination of employment, the Executive shall not receive the
severance payment described in this Agreement paragraph 7(c). 
 (d) Compliance with Protective Covenants.
Notwithstanding anything to the contrary in this Agreement, in the event Executive fails or ceases to fully abide by all of the covenants contained in Agreement paragraph 9, or in the event any court of competent jurisdiction or arbitrator deems any
such covenant(s) to be invalid or unenforceable as the result of a challenge by Executive, then Executive acknowledges and agrees that such circumstances shall constitute a failure of consideration and Executive shall not be entitled to any
compensation pursuant to Agreement paragraphs 7(b) or (c). If Executive has already received any such compensation at the time he violates any such covenant, the Employers shall immediately be entitled to recover all such amounts in full from
Executive. 
 (e) Limits on Payments. Executive and the Employers intend for all payments under this Agreement to be
either outside the scope of Section 409A of the Code or to comply with its requirements as to timing of payments. Accordingly, to the extent applicable, this Agreement shall at all times be operated in accordance with the

  
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requirements of Section 409A of the Code, as amended, and the regulations and rulings thereunder, including any applicable transition rules. The Employers shall have authority to take
action, or refrain from taking any action, with respect to the payments and benefits under this Agreement that is reasonably necessary to comply with Section 409A. Any payments that qualify for the “short-term deferral” exception or
another exception under Section 409A of the Code shall be paid under the applicable exception. For purposes of the limitations on nonqualified deferred compensation under Section 409A of the Code, each payment of compensation under this
Agreement shall be treated as a separate payment of compensation for purposes of applying the Section 409A of the Code deferral election rules and the exclusion under Section 409A of the Code for certain short-term deferral amounts.
Notwithstanding anything in this Agreement to the contrary, if any amounts or benefits payable under this Agreement in the event of Executive’s termination of employment constitute “nonqualified deferred compensation” within the
meaning of Code Section 409A, payment of such amounts and benefits shall commence when the Executive incurs a “separation from service” within the meaning of Treasury Regulation 1.409A-1(h), without regard to any of the optional
provisions thereunder, from the Employers and any entity that would be considered a single employer with the Employers under Code Section 414(b) or 414(c) (“Separation from Service”). Such payments or benefits shall be provided in
accordance with the timing provisions of this Agreement by substituting the Agreement’s references to “termination of employment” or “termination” with Separation from Service. In addition, if at the time of Executive’s
Separation from Service the Executive is a “specified employee” within the meaning of Code Section 409A(a)(2)(B)(i), any amount or benefits that the constitutes “nonqualified deferred compensation” within the meaning of Code
Section 409A that becomes payable to Executive on account of the Executive’s Separation from Service will not be paid until after the earlier of (i) first business day of the seventh month following Executive’s Separation from
Service, or (ii) the date of the Executive’s death (the “409A Suspension Period”). Within 14 calendar days after the end of the 409A Suspension Period, the Executive shall be paid a cash lump sum payment equal to any payments
(including interest on any such payments, at an interest rate of not less than the prime interest rate, as published in the Wall Street Journal, over the period such payment is restricted from being paid to the Executive) and benefits that the
Company would otherwise have been required to provide under this Agreement but for the imposition of the 409A Suspension Period delayed because of the preceding sentence. Thereafter, the Executive shall receive any remaining payments and benefits
due under this Agreement in accordance with the terms of this Section (as if there had not been any Suspension Period beforehand). To the extent not otherwise specified in this Agreement, all (A) reimbursements and (B) in-kind benefits
provided under this Agreement shall be made or provided in accordance with the requirements of Section 409A of the Code, including, where applicable, the requirement that (1) any reimbursement is for expenses incurred during the
Executive’s lifetime (or during a shorter period of time specified in this Agreement); (2) the amount of expenses eligible for reimbursement, or in kind benefits provided, during a calendar year may not affect the expenses eligible for
reimbursement, or in kind benefits to be provided, in any other calendar year; (3) the reimbursement of an eligible expense will be made no later than the last day of the calendar year following the year in which the expense is incurred; and
(4) the right to reimbursement or in kind benefits is not subject to liquidation or exchange for another benefit. 

  
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 Notwithstanding any provision of this Agreement to the contrary, if any payments
or benefits received under this Agreement would constitute an “excess parachute payment” within the meaning of Section 280G of the Code, the payments or benefits provided to Executive under this Agreement will be reduced by reducing
the amount of payments or benefits payable to Executive to the extent necessary so that no portion of Executive’s payments or benefits will be subject to the excise tax imposed by Section 4999 of the Code. Notwithstanding the foregoing, a
reduction will be made under the previous sentence only if, by reason of that reduction, Executive’s net after tax benefit exceeds the net after tax benefit he or she would realize if the reduction were not made. If any payments or benefits are
reduced under this Agreement pursuant to this paragraph and Executive is assessed any excise tax under Code Section 4999 as a result of payments or benefits under this Agreement, the Executive shall pay all such assessed excise taxes, and any
income taxes and additional excise taxes resulting solely from the payment of such excise taxes. 
 (f) Voluntary
Termination of Employment. If the Executive terminates his employment without Good Reason, then the Employers shall pay to Executive, or in the event of his subsequent death, to his designated beneficiary or beneficiaries, or to his estate, as
the case may be, any accrued but unpaid Base Salary through the date of termination of Executive’s employment, and any earned but unpaid cash bonuses for any prior period. 

8. Regulatory Suspension. 

(a) If Executive is suspended and/or temporarily prohibited from participating in the conduct of the affairs of the Bank by a
notice served under Sections 8(e)(3) or (g)(1) of the Federal Deposit Insurance Act, 12 U.S.C. § 1818(e)(3) or (g)(1), the obligations of the Employers under this Agreement shall be suspended as of the date of service of such notice, unless
stayed by appropriate proceedings. If the charges in the notice are dismissed, the Employers, subject to any bar or prohibition arising from any applicable law or regulation, shall (i) pay Executive the compensation withheld while its contract
obligations were suspended and (ii) reinstate in whole or in part any of its obligations which were suspended; provided, however, that the Employers’ obligation to pay or reinstate as set forth herein shall not exceed one year of
compensation or other obligations, shall be reduced by the amount of any compensation received by Executive from any source during the period of suspension, and shall be contingent upon faithful compliance by Executive with the Protective Covenants
in Agreement paragraph 9 throughout such period of suspension. Vested rights of Executive shall not otherwise be affected. 

(b) If Executive is removed and/or permanently prohibited from participating in the conduct of the affairs of the Bank by an
order issued under Section 8(e)(4) or (g)(1) of the Federal Deposit Insurance Act, 12 U.S.C. § 1818(e)(4) or (g)(1), all obligations of the Employers under this Agreement shall terminate as of the effective date of the order, but vested
rights of the parties hereto shall not be affected. 

  
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 9. Protective Covenants. Executive shall abide by and be bound by the following Protective
Covenants: 
 (a) Confidential Information and Trade Secrets. During Executive’s employment, the parties
acknowledge that the Employers shall disclose, or have already disclosed, to Executive for use in Executive’s employment, and that Executive will be provided access to and otherwise make use of, acquire, create, or add to certain valuable,
unique, proprietary, and secret information of the Employers (whether tangible or intangible and whether or not electronically kept or stored), including financial statements, drawings, designs, manuals, business plans, processes, procedures,
formulas, inventions, pricing policies, customer and prospect lists and contacts, contracts, sources and identity of vendors and contractors, financial information of customers of the Employers, and other proprietary documents, materials, or
information indigenous to the Employers, relating to their businesses and activities, or the manner in which the Employers do business, which is valuable to the Employers in conducting their business because the information is kept confidential and
is not generally known to the Employers’ competitors or to the general public (“Confidential Information”). Confidential Information does not include information generally known or easily obtained from public sources or public
records, unless Executive causes the Confidential Information to become generally known or easily obtained from public sources or public records. 

To the extent that the Confidential Information rises to the level of a trade secret under applicable law, then Executive
shall, during Executive’s employment and for so long as the Confidential Information remains a trade secret under applicable law (or for the maximum period of time otherwise allowed by applicable law) (i) protect and maintain the
confidentiality of such trade secrets and (ii) refrain from disclosing, copying, or using any such trade secrets, without the Employers’ prior written consent, except as necessary in Executive’s performance of Executive’s duties
while employed with the Employers. 
 To the extent that the Confidential Information defined above does not rise to the
level of a trade secret under applicable law, Executive shall, during Executive’s employment and for a period of two years following any voluntary or involuntary termination of employment (whether by the Employers or Executive),
(i) protect and maintain the confidentiality of the Confidential Information and (ii) refrain from disclosing, copying, or using any Confidential Information without the Employers’ prior written consent, except as necessary in
Executive’s performance of Executive’s duties while employed with the Employers. 
 (b) Return of Property of
the Employers. Upon any voluntary or involuntary termination of Executive’s employment (or at any time upon request of the Employers), Executive agrees to immediately return to the Employers all property of the Employers (including, without
limitation, all documents, electronic files, records, computer disks or 

  
 12 

 
other tangible or intangible things that may or may not relate to or otherwise comprise Confidential Information or trade secrets, as defined by applicable law) that Executive created, used,
possessed or maintained while working for the Employers from whatever source and whenever created, including all reproductions or excerpts thereof. This provision does not apply to purely personal documents of Executive, but it does apply to
business calendars, Rolodexes, customer lists, contact sheets, computer programs, disks and their contents and like information that may contain some personal matters of Executive. Executive acknowledges that title to all such property is vested in
the Employers. 
 (c) Non-Diversion of Business Opportunity. During Executive’s employment with the Employers and
consistent with Executive’s duties and fiduciary obligations to the Employers, Executive shall (i) disclose to the Employers any business opportunity that comes to Executive’s attention during Executive’s employment with the
Employers and that relates to the business of the Employers or otherwise arises as a result of Executive’s employment with the Employers and (ii) not take advantage of or otherwise divert any such opportunity for Executive’s own
benefit or that of any other person or entity without prior written consent of the Employers. 
 (d) Non-Solicitation of
Customers. During Executive’s employment and for a period of twelve (12) months following any employment termination, Executive agrees not to, directly or indirectly, contact, solicit, divert, appropriate, or call upon, the customers
or clients of the Employers with whom Executive has had material contact during the last year of Executive’s employment with the Employers, including prospects of the Employers with whom Executive had such contact during said last year of
Executive’s employment (i) to solicit such customers or clients or prospective customers or clients for a Competitive Business as herein defined (including, without limitation, any Competitive Business started by Executive) or (ii) to
otherwise encourage any such customer or client to discontinue, reduce, or adversely alter the amount of its business with the Employers. Executive acknowledges that, due to Executive’s relationship with the Employers, Executive will develop,
or has developed, special contacts and relationships with the Employers’ clients and prospects, and that it would be unfair and harmful to the Employers if Executive took advantage of these relationships. 

A “Competitive Business”, as defined in this Agreement, is an enterprise that is in the business of offering
banking products and/or services, which services and/or products are similar or substantially identical to those offered by the Employers during Executive’s employment with the Employers. 

(e) Non-Piracy of Employees. During Executive’s employment and for a period of twelve (12) months following
any termination, Executive covenants and agrees that Executive shall not, directly or indirectly: (i) solicit, recruit, or hire (or attempt to solicit, recruit, or hire) or otherwise assist anyone in soliciting, recruiting, or hiring, any
employee or independent contractor (which shall not include non-exclusive outside vendors) of the Employers who performed work for the Employers within the last six (6) months of Executive’s employment with the Employers or who was
otherwise engaged or employed with the Employers at the time of said termination of employment of Executive 

  
 13 

 
or (ii) otherwise encourage, solicit, or support any such employees or independent contractors to leave their employment or engagement with the Employers, in either case until such employee
or contractor has been terminated or separated from the Employers for at least twelve (12) months. 
 (f)
Non-Compete. During Executive’s employment and for a period of twelve (12) months following any employment termination, Executive agrees not to, directly or indirectly, compete with the Employers, as an officer, director, member,
principal, partner, shareholder (other than a shareholder in a company that is publicly traded and so long as such ownership is less than five percent), owner, manager, supervisor, administrator, employee, consultant, or independent contractor, by
working in the Territory (as defined herein) for or as a “Competitive Business” (as defined above) in the Territory (as defined herein), in a capacity identical or substantially similar to the capacity in which Executive served at the
Employers. The “Territory” shall be defined as any other state in which the Employers actively solicit business or are engaged in doing business. Executive acknowledges that the Employers conduct their business within the Territory, that
Executive will perform services for and on behalf of the Employers within the Territory, and that this paragraph 9(f) (and the Territory) is a reasonable limitation on Executive’s ability to compete with the Employers. 

(g) Acknowledgment. It is understood and agreed by Executive that the parties have attempted to limit his right to
compete only to the extent necessary to protect the Employers from unfair competition and that the terms and provisions of this paragraph 9 are not intended to restrict Executive in the exercise of his skills or the use of knowledge or information
that does not rise to the level of a trade secret under applicable law or Confidential Information of the Employers (to which trade secrets and Confidential Information Executive has had and/or will have access and has made and/or will make use of
during employment with the Employers). 
 It is acknowledged that the purpose of these covenants and promises is (and that
they are necessary) to protect the Employers’ legitimate business interests, to protect the Employers’ investment in the overall development of its business and the good will of its customers, and to protect and retain (and to prevent
Executive from unfairly and to the detriment of the Employers utilizing or taking advantage of) such business trade secrets and Confidential Information of the Employers and those substantial contacts and relationships (including those with
customers and employees of the Employers) which Executive established due to his employment with the Employers. 
 This
Agreement is not intended to preclude Executive’s opportunity to engage in or otherwise pursue occupations in any unrelated or non-competitive field of endeavor, or to engage in or otherwise pursue directly competitive endeavors so long as they
meet the requirements of this Agreement. Executive represents that his experience and abilities are such that existence or enforcement of these covenants and promises will not prevent Executive from earning or pursuing an adequate livelihood and
will not cause an undue burden to Executive or his family. 

  
 14 

 Executive acknowledges that these covenants and promises (and their respective
time, geographic, and/or activity limitations) are reasonable and that said limitations are no greater than necessary to protect said legitimate business interests in light of Executive’s position with the Employers and the Employers’
business, and Executive agrees to strictly abide by the terms hereof. 
 10. Source of Payments. All payments provided in Agreement
paragraphs 4, 6, and 7 shall be paid in cash from the general funds of the Employers, or their successors in interest, as provided herein; and no special or separate fund shall be established by the Employers, and no other segregation of assets
shall be made to assure payment. Executive shall have no right, title, or interest in or to any investments which the Employers may make to meet its payment obligations. 

11. Injunctive Relief/Arbitration. The Employers or Executive shall have the right to apply to any court of competent jurisdiction for
injunctive relief with respect to the enforcement of the covenants and agreements set forth in Agreement paragraph 9. This remedy shall be in addition to, and not in limitation of, any other rights or remedies to which the Employers or Executive are
or may be entitled at law or in equity respecting this Agreement. All other disputes or claims for relief arising from or related to this Agreement, Executive’s employment with the Employers, or the termination of Executive’s employment
with the Employers, or as to arbitrability shall be brought and resolved in binding arbitration before the American Arbitration Association. The arbitration shall be conducted under the AAA National Rules for the Resolution of Employment Disputes.
The Employers and Executive agree that the arbitration will be conducted in Atlanta, Georgia. Judgment upon any award rendered by the arbitrator may be entered only in the Superior Court of Fulton County, Georgia, or in the U.S. District Court for
the Northern District of Georgia (Atlanta Division). 
 12. Attorneys’ Fees. In the event any party hereto is required to engage
in legal action, whether before a court of competent jurisdiction or before the American Arbitration Association, against any other party hereto, either as plaintiff or defendant, in order to enforce or defend any of its or his rights under this
Agreement, and such action results in a final judgment in favor of one or more parties, then the party or parties against whom said final judgment is obtained shall reimburse the prevailing party or parties for all legal fees and expenses incurred
by the prevailing party or parties in asserting or defending its or his rights hereunder. Furthermore, if following a Change of Control Executive must bring a claim to enforce Executive’s rights, and such claim results in payments to Executive,
then whether or not reduced to a final judgment, Executive shall be reimbursed for reasonable legal fees incurred. 
 13. No Duty to
Mitigate. In no event shall the Executive be obligated to seek other employment or take any other action by way of mitigation of the amounts payable to the Executive under any provisions of this Agreement and such amounts shall not be reduced
regardless of whether the Executive obtains other employment. 
 14. Federal Income Tax Withholding. The Employers may withhold from
any benefits payable under this Agreement all federal, state, city, or other taxes as shall be required pursuant to any law or governmental regulation or ruling. 

  
 15 

 15. Effect of Prior Agreements. This Agreement constitutes the entire agreement between
the parties concerning the subject matter of this Agreement. No oral statements or prior written material not specifically incorporated in this Agreement shall be of any force and effect, and no changes in or additions to this Agreement shall be
recognized, unless incorporated in this Agreement by written amendment, such amendment to become effective on the date stipulated in it. Executive acknowledges and represents that, in executing this Agreement, he did not rely, and has not relied, on
any communications, promises, statements, inducements, or representation(s), oral or written, by the Employers or any of its officers, directors, attorneys, agents, or representatives, except as expressly contained in this Agreement. This Agreement
supersedes any prior employment agreement and any contemporaneous oral agreement or understanding by or between the Employers and Executive. 

16. General Provisions. 

(a) Nonassignability. Neither this Agreement nor any right or interest hereunder shall be assignable by Executive, his
beneficiaries or legal representatives, without the prior written consent of the Employers; provided, however, that nothing in this Agreement paragraph 16(a) shall preclude (i) Executive from designating a beneficiary to receive any benefits
payable hereunder upon his death, or (ii) the executors, administrators, or other legal representatives of Executive or his estate from assigning any rights hereunder to the person or persons entitled thereto. The Employers may assign this
Agreement without the consent of Executive. 
 (b) No Attachment. Except as required by law, no right to receive
payments under this Agreement shall be subject to anticipation, commutation, alienation, sale, assignment, encumbrance, charge, pledge, or hypothecation, or to execution, attachment, levy, and any attempt, voluntary or involuntary, to effect any
such action shall be null, void, and of no effect. 
 (c) Binding Agreement. This Agreement shall be binding upon, and
inure to the benefit of, the Employers and Executive and their respective heirs, successors, assigns, and legal representatives. 

(d) No Bar. Executive acknowledges and agrees that the existence of any claim or cause of action against the Employers
shall not constitute a defense to the enforcement by the Employers of Executive’s covenants, obligations, or undertakings in this Agreement. 

(e) No Conflicting Obligations. Executive hereby acknowledges and represents that his execution of this Agreement and
performance of employment-related obligations and duties for the Employers will not cause any breach, default, or violation of any other employment, nondisclosure, confidentiality, non-competition, or other agreement to which Executive may be a
party or otherwise bound. 
 Moreover, Executive hereby agrees that he will not use in the performance of such
employment-related obligations and duties for the Employers or otherwise disclose to the Employers any trade secrets or confidential information of any person or entity 

  
 16 

 
(including any former employer) if and to the extent that such use or disclosure may cause a breach or violation of any obligation or duty owed to such employer, person, or entity under any
agreement or applicable law. 
 17. Modification and Waiver. 

(a) Amendment of Agreement. This Agreement may not be modified or amended except by an instrument in writing, signed by
the parties hereto, and which specifically refers to this Agreement. 
 (b) Waiver. No term or condition of this
Agreement shall be deemed to have been waived, nor shall there be any estoppel against the enforcement of any provision of this Agreement, except by written instrument of the party charged with such waiver or estoppel. No such written waiver shall
be deemed a continuing waiver unless specifically stated therein, and each waiver shall operate only as to the specific term or condition waived and shall not constitute a waiver of such term or condition for the future or as to any act other than
that specifically waived. 
 18. Severability. If for any reason any provision of this Agreement is held invalid, the parties agree
that the court or arbitrator shall modify the provision(s) (or subpart(s) thereof) to make the provision(s) (or subpart(s) thereof) and this Agreement valid and enforceable. Any invalid provision shall not affect any other provision of this
Agreement not held invalid, and each such other provision shall to the full extent consistent with law continue in full force and effect. If any provision of this Agreement shall be held invalid in part, such invalidity shall in no way affect the
rest of such provision not held so invalid, and the rest of such provision, together with all other provisions of this Agreement, shall to the full extent consistent with law continue in full force and effect. 

19. Headings. The headings of the Agreement paragraphs are included solely for convenience of reference and shall not control the
meaning or interpretation of any of the provisions of this Agreement. 
 20. Governing Law. This Agreement has been executed and
delivered in the State of Georgia, and its validity, interpretation, performance, and enforcement shall be governed by the laws of the State of Georgia. 

21. Rights of Third Parties. Nothing herein expressed or implied is intended to or shall be construed to confer upon or give to any
person, firm, or other entity, other than the parties hereto and their permitted assigns, any rights or remedies under or by reason of this Agreement. 

  
 17 

 22. Notices. All notices, requests, demands, and other communications provided for by this
Agreement shall be in writing and shall be sufficiently given if and when mailed in the United States by registered or certified mail, or personally delivered, to the party entitled thereto at the address stated below or to such changed address as
the addressee may have given by a similar notice: 
  

					
			To the Employers:		Chairman
					Board of Directors
					Atlantic Capital Bank
					3280 Peachtree Road
					Suite 1600
					Atlanta, Georgia 30326
			
			Copied to		Steven S. Dunlevie, Esq.
			Employers’ counsel:		Womble Carlyle Sandridge & Rice, LLP
					 271 17th Street, N.W.

Suite 2400

					Atlanta, Georgia 30309
			
			To Executive:		

 Any notice to the Employers is ineffective if not also sufficiently given to its counsel. 

23. Effective Date. The Effective Date of this Agreement is the date of merger of Atlantic Capital Bancshares, Inc. and First Security
Group, Inc. (the “Merger”). In the event the Merger does not occur, this Agreement is null and void. 

  
 18 

 IN WITNESS WHEREOF, the Holding Company and the Bank have caused this Agreement to be
executed and their seals to be affixed hereunto by their duly authorized officers, and Executive has signed this Agreement, as of the date set forth above. 
  

							
	ATTEST:				ATLANTIC CAPITAL BANCSHARES, INC.
				
	 /s/ Carol H. Tiarsmith
						
	Secretary				By:		 /s/ Douglas L. Williams

					Name:		Douglas L. Williams
	(CORPORATE SEAL)						
					Title:		President and Chief Executive Officer
			
	ATTEST:				ATLANTIC CAPITAL BANK
				
	 /s/ Carol H. Tiarsmith
						
	Secretary				By:		 /s/ Douglas L. Williams

					Name:		Douglas L. Williams
				
	(BANK SEAL)						
					Title:		President and Chief Executive Officer
			
					EXECUTIVE
			
	 /s/ Carol H. Tiarsmith
				 /s/ D. Michael Kramer

	Witness				D. Michael Kramer

  
 19 

 EXHIBIT A 

RELEASE 
 In exchange for
certain termination payments, benefits and promises to which                      (“Executive”) would not otherwise be entitled, Executive,
knowingly and voluntarily releases and Atlantic Capital Bank and Atlantic Capital Bancshares, Inc., their subsidiaries, affiliates or related corporations, together with their officers, directors, agents, employees and representatives (collectively,
the “Employer”), of and from any and all claims, demands, obligations, liabilities and causes of action, of whatsoever kind in law or equity, whether known or unknown, which Executive has or ever had against the Employer on or before the
date of the execution of this Release, including but not limited to claims in common law, whether in contract or in tort, and causes of action under the Age Discrimination in Employment Act, 29 U.S.C. Sections 621 et seq., Title VII of the Civil
Rights Act of 1964, 42 U.S.C. Sections 2000e et seq., the Employee Retirement Income Security Act, 29 U.S.C. Sections 1001 et seq., the Americans with Disabilities Act, 29 U.S.C. Section 12101 et seq., and all other federal, state or local
laws, ordinances or regulations, for any losses, injuries or damages (including compensatory or punitive damages), attorney’s fees and costs arising out of employment or termination from employment with the Employer. Notwithstanding the
foregoing, Executive does not waive or release the Employer from any claims, demands, obligations, liabilities or causes of action that may hereafter arise as the result of the breach by the Employer of its obligations under the Employment Agreement
dated as of             , 20    by and among the Atlantic Capital Bancshares, Inc., Atlantic Capital Bank and Executive. 

Executive acknowledges that he has had a period of twenty-one (21) days from the date of receipt of this Release to consider it.
Executive acknowledges that he has been given the opportunity to consult an attorney prior to executing this Release. This Release shall not become effective or enforceable until seven (7) days following its execution by Executive. Prior to the
expiration of the seven-(7) day period, Executive may revoke Executive’s consent to this Release. 
 Executive acknowledges by
executing this Release that Executive has returned to the Employer all Employer property in Executive’s possession. 
 Executive
acknowledges that the terms of this Release and Executive’s separation of employment are confidential and, unless otherwise required by law or for the purposes of enforcing the Release or when needed to consult with Executive’s immediate
family or tax or legal advisors, neither Executive nor Executive’s agents shall divulge, publish or publicize any such confidential information to any third parties or the media, or to any current or former employee, customer or client of the
Employer or its businesses or any of its affiliates. 
 EXECUTIVE ACKNOWLEDGES HE FULLY UNDERSTANDS THE CONTENTS OF THIS RELEASE AND
EXECUTES IT FREELY AND VOLUNTARILY, WITHOUT DURESS, COERCION OR UNDUE INFLUENCE. 
  

									
	Signed:		  
				Date:		  

			            ExecutiveEX-10.6

 Exhibit 10.6 

[ATLANTIC CAPITAL LETTERHEAD] 

March 24, 2015 
 John R. Haddock 

531 Broad Street 
 Chattanooga, TN 37402 

 

	Re:	Retention Benefits 

 Dear John: 

As Atlantic Capital Bancshares, Inc. (“Atlantic”) and First Security Group, Inc. (“FSG”) and their affiliates
(collectively, the “Employer”) strive to achieve certain important goals in the upcoming months, it is critical that we retain our experienced and key employees. Because you are a valued employee, the Employer is providing an opportunity
for you to earn additional compensation as outlined below, (the “Retention Benefits”) that includes certain items that are contingent upon your continued employment with the Employer and its successors through December 31, 2015 (the
“Retention Date”) with two additional 90-day extensions available by the mutual agreement of the Employer and the Employee (the “Extension Periods”). 

The Effective Date of this Agreement (the “Effective Date”) is the date of the merger of Atlantic and FSG. In the event the merger
between Atlantic and FSG does not occur, this Agreement is null and void and your employment shall continue with FSG subject to the terms of the Employment Agreement dated April 11, 2014 (“FSG Employment Agreement”). 

As of the Effective Date, this retention agreement (“Retention Agreement”) replaces and supersedes any prior employment agreements
that relates to severance benefits. If you choose not to accept this Agreement, your employment will terminate on the effective date of the merger of Atlantic and FSG, and you will receive the severance benefits under the change of control
provisions provided for in the FSG Employment Agreement. 
 The Retention Benefits will be payable to you in accordance with the following
terms and conditions: 
  

	 	1.	Your current base salary of $243,100 (“Current Base Salary”) and target bonus of 30% (“Target Bonus”) of Current Base Salary shall remain in effect for your continued employment with the Employer.

	 	2.	The Employer will pay to you a minimum cash bonus for 2015 equal to 30% of your then Current Base Salary. If you remain employed after December 31, 2015, the Employer will pay to you a minimum cash bonus for 2016
equal to 30% of your Current Base Salary, prorated for the portion of the year during which you are employed during 2016. The annual cash bonus will be paid in accordance with the normal payroll practices of the Employer, and will be subject to all
applicable withholdings. The 2016 cash bonus, as applicable, will be paid in accordance with normal payroll practices of the Employer and will be paid within 60 days following separation. 

 

	 	3.	If you terminate employment from the Employer on or after the Retention Date, or in the event of your involuntary termination without Cause prior to the Retention Date, all remaining unvested stock options will
immediately vest and you will be eligible to exercise all outstanding stock options during the remaining term of the options, defined as ten years from the grant date. 

 

	 	4.	As of the Effective Date of this Agreement, upon your termination of employment for any reason and whether voluntary or involuntary, you will be entitled to receive severance benefits in an amount equal to 2.25 times
the sum of your Current Base Salary plus Target Bonus in equal semi-monthly installments over a twenty-four month period. 

  

	 	a.	In return for the severance payment described in this paragraph 4, you must execute a full release and waiver (the Severance Agreement and Full and Final Release of Claims attached hereto as Exhibit “A” and
made a part of this Agreement) of all known or unknown claims or causes of action you may have against the Employer. The severance payments shall begin within 60 days following your termination of employment provided you have executed the release
and the release has become irrevocable before then. If the 60-day period described in the immediately preceding sentence begins in one calendar year and ends in a later calendar year, the payments shall begin in the later calendar year even if you
execute the release and it becomes irrevocable in the earlier calendar year. If you do not execute the release and the release does not become irrevocable before the 60th day after your termination of employment, you will not receive the severance
payment described in this paragraph 4. 

  

	 	b.	 Notwithstanding any provision of this Agreement to the contrary, if any amount or benefit to be paid or provided under this Agreement or otherwise
payable to you by the Employer would be an “Excess Parachute Payment,” within the meaning of Section 280G of the Code, but for the application of this sentence, then the payments and benefits to be paid or provided under this
Agreement will be reduced to the minimum extent necessary (but in no event to less than zero) so that no portion of any such payment or benefit, as so reduced, constitutes an Excess Parachute Payment; provided, however, that the foregoing reduction
will be made only if and to the extent that such reduction would result in an increase in the aggregate payment and benefits to be provided, determined on an after-tax basis (taking into account the excise tax imposed pursuant to Section 4999
of the Code, any tax imposed by any comparable provision of state law, and any 

	 	
applicable federal, state and local income and employment taxes). Whether requested by you or the Employer, the determination of whether any reduction in such payments or benefits to be provided
under this Agreement or otherwise is required pursuant to the preceding sentence will be made at the expense of the Employer by the Employer’s independent accountants. In the event the payments to you are required to be reduced pursuant to
paragraph 4, the portions of the payments that would be paid latest in time will be reduced first and if multiple portions of the payments to be reduced are paid at the same time, any non-cash payments will be reduced before any cash payments, and
any remaining cash payments will be reduced pro rata. 

  

	 	c.	In the event that any of the Employer’s regulatory capital ratios fall below the levels to be considered “well-capitalized” under applicable bank regulations, you may demand that all future payments be
paid in a lump sum benefit within 30 days; except to the extent the payments hereunder are subject to Section 409A of the Internal Revenue Code and acceleration of such payments would be prohibited by Section 409A. 

 

	 	5.	As of the Effective Date of this Agreement, you are entitled to the following COBRA benefit. The benefit will begin following your separation date. The Employer will reimburse to you an amount equal to the
Employer’s portion of the health insurance premiums then paid for active employees for the level of coverage you elect pursuant to COBRA until the earlier of the expiration of the twelve (12) month period following the termination date or
the date on which you receive substantially comparable coverage and benefits under the group health plans of a subsequent employer. 

  

	 	6.	For purposes of this Agreement, “Cause” shall mean your (i) act of fraud against or material dishonesty in the course of your employment to the Employer that results in material financial harm to the
Employer; (ii) conviction of a crime constituting a felony; (iii) willful misconduct or gross negligence in the performance of your duties that results in material financial harm to the Employer, or (iv) material breach of any written
code of conduct applicable to your employment with the Employer that results in material financial harm to the Employer. For items (i), (iii) and (iv), written notice must be provided within 30 days of the alleged action and you will be
entitled to a 30 day cure period. 

  

	 	7.	 All payments under this Agreement are intended to be either outside the scope of Section 409A or to comply with its requirements as to timing of
payments. Accordingly, to the extent applicable, this Agreement shall at all times be operated in accordance with the requirements of Section 409A. The Employer shall have authority to take action, or refrain from taking any action, with
respect to the payments and benefits under this Agreement that is reasonably necessary to comply with Section 409A. Any payments that qualify for the “short-term deferral” exception or another exception under Section 409A shall
be paid under the applicable exception. Notwithstanding anything in this Agreement to the contrary, if any amounts or benefits payable under this Agreement in the event of your termination of employment constitute “nonqualified deferred

	 	
compensation” within the meaning of Section 409A, payment of such amounts and benefits shall commence when you incur a “separation from service” within the meaning of Treasury
Regulation 1.409A-1(h), without regard to any of the optional provisions thereunder, from the Employer and any entity that would be considered a single employer with the Employers under Code Section 414(b) or 414(c) (“Separation from
Service”). Such payments or benefits shall be provided in accordance with the timing provisions of this Agreement by substituting the Agreement’s references to “termination of employment” or “termination” with
Separation from Service. In addition, if you are a “specified employee” within the meaning of Code Section 409A(a)(2)(B)(i) at the time of your Separation from Service, any amount or benefits that the constitutes “nonqualified
deferred compensation” within the meaning of Section 409A that becomes payable to you on account of the Separation from Service will not be paid until after the earlier of (i) the first business day of the seventh month following your
Separation from Service, or (ii) the date of the your death (the “409A Suspension Period”). Within 14 calendar days after the end of the 409A Suspension Period, you will be paid a cash lump sum payment equal to any payments (including
interest on any such payments, at an interest rate of not less than the prime interest rate, as published in the Wall Street Journal, over the period such payment is restricted from being paid) and benefits that the Employer would otherwise have
been required to provide under this Agreement but for the imposition of the 409A Suspension Period. Thereafter, you will receive any remaining payments and benefits due under this Agreement. 

Please be aware that upon acceptance of this Agreement, your employment will continue as an “at-will” employee of the Employer.
Thus, you may terminate your employment with the Employer at any time, and the Employer may terminate your employment at any time. 
 To
acknowledge your understanding and acceptance of the terms and conditions of this Agreement, please sign and date the enclosed copy of this letter and return the signed copy to me. 

 

	
	Very truly yours,
	
	/s/ Douglas L. Williams

 ACCEPTED AND AGREED this 26th day of March, 2015. 

 

	
	 /s/ John R. Haddock

	John R. Haddock

 Exhibit “A” 

SEVERANCE AGREEMENT AND 

FULL AND FINAL RELEASE OF CLAIMS 

This Severance Agreement and Full and Final Release of Claims (“Agreement”) is made and entered into by and among Atlantic Capital
Bancshares, Inc., a bank holding company organized under the laws of the State of Georgia (the “Company”), Atlantic Capital Bank, N.A., a national association organized under the laws of the United States (the “Bank” and
collectively with the Company, the “Employer”), and John R. Haddock (the “Executive”). 
 1.
SEPARATION. Executive’s employment with the Employer will terminate on March 24, 2015 or such later date as may be determined by the parties (“Separation Date”). The parties acknowledge that Executive’s
termination from employment will result in a “Separation from Service” as defined in Section 409A of the Internal Revenue Code. Executive further agrees that the Executive hereby resigns as an officer and director of the Employer and
any related or affiliated entities as of the Separation Date, as applicable. 
 2. CONSIDERATION. In consideration of
the Executive’s decision to enter into this Agreement, the Employer will continue to employ Executive through the Separation Date and will provide Executive severance pay in accordance with the terms of the employment agreement between the
Employer and the Executive dated March 24, 2015 (the “Retention Agreement”). Federal, state and local tax withholdings and other legal deductions may be applied to the above payment as determined by the Employer in its sole
discretion. 
 Whether or not Executive executes this Agreement, the Employer will pay Executive any and all wages for all hours worked up
to and through the Separation Date within the appropriate time frame required by applicable law. If Executive fails or refuses to execute this Agreement, or if Executive revokes this Agreement as provided herein, Executive will not be entitled to
the consideration set forth above. 
 3. FULL AND FINAL RELEASE. 

(a) In consideration of the payments being provided to Executive above, Executive, for himself, his attorneys, heirs, executors,
administrators, successors and assigns, fully, finally and forever releases and discharges the Employer and all other affiliated companies, including but not limited to First Security Group, Inc., a bank holding company organized under the laws of
the state of Tennessee and FSGBank, N. A., a national banking association organized under the laws of the United States, as well as its and their successors, assigns, officers, owners, directors, agents, representatives, attorneys, and employees
(all of whom are referred to throughout this Agreement as the “Releasees”), of and from all claims, demands, actions, causes of action, suits, damages, losses, and expenses, of any and every nature whatsoever, as a result of actions or
omissions occurring through the date Executive signs this Agreement. 

 Specifically included in this waiver and release are, among other things, any and all claims
related to any severance pay plan, any and all claims related to Executive’s employment and separation from employment or otherwise, including without limitation: (1) Title VII of the Civil Rights Act of 1964, as amended by the Civil
Rights Act of 1991; (2) the Americans with Disabilities Act, as amended; (3) 42 U.S.C. § 1981; (4) the Age Discrimination in Employment Act (29 U.S.C. §§ 621-624); (5) 29 U.S.C. § 206(d)(1); (6) Executive
Order 11246; (7) Executive Order 11141; (8) Section 503 of the Rehabilitation Act of 1973; (9) Executive Retirement Income Security Act (ERISA); (10) the Occupational Safety and Health Act; (11) the Worker Adjustment and
Retraining Notification (WARN) Act; (12) the Family and Medical Leave Act; (13) the Ledbetter Fair Pay Act; and (14) other federal, state and local discrimination laws, including those of the State of Tennessee. 

Executive further acknowledges that Executive is releasing, in addition to all other claims, any and all claims based on any tort,
whistle-blower, personal injury, defamation, invasion of privacy or wrongful discharge theory; retaliatory discharge theory; any and all claims based on any oral, written or implied contract or on any contractual theory (including the Retention
Agreement); any claims based on a severance pay plan; and all claims based on any other federal, state or local Constitution, regulation, law (statutory or common), or other legal theory, as well as any and all claims for punitive, compensatory,
and/or other damages, back pay, front pay, fringe benefits and attorneys’ fees, costs or expenses. 
 (b) Nothing in this Agreement,
however, is intended to waive Executive’s entitlement to vested benefits under any 401(k) plan or other benefit plan provided by the Employer. Furthermore, the parties specifically agree that this release does not cover, and Executive
expressly reserves, indemnification rights existing to the Executive as a current or former director and/or officer of First Security Group, Inc., FSGBank, N.A. and/or the Employer under the Articles and Bylaws of each pursuant to applicable state
law, in accordance with any D&O policy existing for former officers and directors of First Security Group, Inc., FSGBank, N.A. and/or the Employer, and in accordance with the definitive merger agreement by and between First Security Group, Inc.
and Atlantic Capital Bancshares, Inc. Finally, the above release does not waive claims that Executive could make, if available, for unemployment or workers’ compensation or claims that cannot be released by private agreement. 

(c) Executive understands that this Agreement does not bar the Executive from filing a complaint and/or charge with any appropriate federal,
state, or local government agency or cooperating with said agency in its investigation. Executive agrees, however, that the Executive shall not be entitled to receive any relief or recovery (monetary or otherwise) in connection with any complaint or
charge brought against the Releasees, without regard as to who brought said complaint or charge. 
 4. ADVICE OF COUNSEL.
Executive acknowledges that the Executive has been and is hereby advised by the Employer to consult with an attorney in regard to this matter. 

5. POST-EMPLOYMENT COOPERATION. Executive agrees to fully cooperate with the Employer in the defense or prosecution of any
claims or actions now in existence or which may be brought in the future against or on behalf of the Employer which relate to events or occurrences that transpired or which failed to transpire while Executive was employed by the Employer. Executive
also agrees to cooperate fully with the Employer in connection with any 

 
internal investigation or review, or any investigation or review by any federal, state or local regulatory authority, relating to events or occurrences that transpired or failed to transpire
while Executive was employed by the Employer. Executive’s full cooperation in connection with such matters shall include, but not be limited to, providing information to counsel, being available to meet with counsel to prepare for discovery or
trial and acting as a witness on behalf of the Employer at mutually convenient times. 
 6. NO OTHER CLAIMS. Executive
represents that Executive has not filed, nor assigned to others the right to file, nor are there currently pending, any complaints, charges or lawsuits against the Releasees with any governmental agency or any court or in any arbitration forum. 

7. NON-DISPARAGEMENT. Executive agrees that Executive has not (including during the time period while this Agreement was under
consideration by Executive) and will not make statements to clients, customers and suppliers of the Employer or to other members of the public that are in any way disparaging or negative towards the Employer, the Employer’s products or
services, or the Employer’s representatives or employees. 
 The Employer will advise the members of its Boards of Directors and all
executive officers of the Employer (collectively, the “Persons to be Advised”) that they should not make public statements that are in any way disparaging or negative towards the Executive. The Employer will advise the Persons to be
Advised that a non-disparagement agreement is in effect, and will use reasonable efforts to enforce compliance with this Agreement. Notwithstanding the foregoing agreement, the parties hereto recognize and acknowledge that the Employer will not be
liable for statements between the Employer and its independent auditors or statements necessary to comply with applicable law. 
 8.
NON-ADMISSION OF LIABILITY OR WRONGFUL CONDUCT. This Agreement shall not be construed as an admission by the Employer of any liability or acts of wrongdoing or discrimination, nor shall it be considered to be evidence of such liability,
wrongdoing, or discrimination. 
 9. RETURN OF PROPERTY. Executive acknowledges, understands, and agrees that Executive
will turn over to Atlantic Capital Bank all documents, files, memoranda, records, credit cards, books, manuals, computer equipment, computer software, pagers, cellular phones, facsimile machines, PDAs, keys and electronic keys or access cards into
the building and any other equipment or documents, and all other physical or electronic property of similar type that Executive received from the Employer and/or that Executive used in the course of his employment with the Employer and that are the
property of the Employer, except as mutually agreed to in writing. Executive agrees that Executive will not delete, destroy or erase any data stored on or associated with such property, including but not limited to data stored on computers, servers,
phones, or other electronic devices. Executive further agrees to return to Atlantic Capital Bank any and all hard copies of any documents which are the subject of a document preservation notice or other legal hold and to notify Atlantic Capital Bank
of the location of any electronic documents which are subject to a legal hold. 

 10. CONFIDENTIALITY. The nature and terms of this Agreement are strictly
confidential and they have not been and shall not be disclosed by Executive at any time to any person (including the Employer’s employees) except Executive’s lawyer, accountant, or immediate family without the prior written consent of an
officer of the Employer, except as necessary in any legal proceedings directly related to the provisions and terms of this Agreement, to prepare and file income tax forms, or pursuant to court order after reasonable notice to the Employer. Executive
may disclose that Executive is subject to an agreement not to disclose trade secrets and confidential information where necessary to comply with such confidentiality agreement. Executive agrees that Executive is responsible for informing these
persons of the confidential nature of this Agreement and that any breach of this confidentiality provision by any of these persons shall be deemed a breach by Executive. 

11. GOVERNING LAW. This Agreement shall be interpreted under the laws of the State of Tennessee. 

12. SEVERABILITY. The provisions of this Agreement are severable, and if any part of this Agreement except Paragraphs 3,
5 or 7 are found by a court of law to be unenforceable, the remainder of the Agreement will continue to be valid and effective, and the court is authorized to amend relevant provisions of the Agreement to carry out the intent of the parties to the
extent legally permissible. If Paragraph 3, 5 or 7 is found by a court of competent jurisdiction to be unenforceable, the parties agree to seek a determination by the court as to the rights of the parties, including whether Executive is entitled
under those circumstances and the relevant law to retain the benefits paid to Executive under this Agreement. 
 13. SOLE AND ENTIRE
AGREEMENT. This Agreement and the Retention Agreement set forth the entire agreement between the parties with respect to the subject matters covered by this Agreement and the Retention Agreement. Any other prior agreements between or
directly involving the parties to the Agreement and the Retention Agreement with respect to the subject matters covered by this Agreement and the Retention Agreement are superseded by the terms of this Agreement and the Retention Agreement and thus
are rendered null and void. 
 14. NO OTHER PROMISES. Executive affirms that the only consideration for his signing this
Agreement is that set forth in Paragraph 2 that no other promise or agreement of any kind has been made to or with Executive by any person or entity to cause Executive to execute this document, and that Executive fully understands the meaning and
intent of this Agreement, including but not limited to, its final and binding effect. 
 15. ACKNOWLEDGEMENTS. 

(a) Executive acknowledges, understands and agrees that Executive has been notified of Executive’s rights under the Family and Medical
Leave Act (FMLA) and state leave laws. Executive further acknowledges, understands and agrees that Executive has not been denied any leave requested under the FMLA or applicable state leave laws and that, to the extent applicable, Executive has been
returned to Executive’s job, or an equivalent position, following any FMLA or state leave taken pursuant to the FMLA or state laws. 

 (b) Executive acknowledges, understands and agrees that it is Executive’s obligation to make
a timely report, in accordance with the Employer’s policy and procedures, of any work related injury or illness. Executive further acknowledges, understands and agrees that Executive has reported to the Employer’s management personnel any
work related injury or illness that occurred up to and including Executive’s last day of employment. 
 16. LEGALLY BINDING
AGREEMENT. Executive understands and acknowledges that this Agreement contains a full and final release of claims against the Employer; and that Executive has agreed to its terms knowingly, voluntarily, and without intimidation, coercion or
pressure. 
 17. ADVICE OF COUNSEL / CONSIDERATION AND REVOCATION PERIODS. Executive hereby acknowledges and agrees that this
Agreement and the termination of Executive’s employment and all actions taken in connection therewith are in compliance with the Age Discrimination in Employment Act and the Older Workers Benefit Protection Act and that the releases set forth
herein shall be applicable, without limitation, to any claims brought under these Acts. Executive acknowledges that the Executive has been and is hereby advised by the Employer to consult with an attorney in regard to this matter. Executive further
acknowledges that Executive has been given more than twenty-one (21) days from the time that Executive receives this Agreement to consider whether to sign it. Executive shall have seven (7) days from the date Executive signs this Agreement
to revoke the Agreement. To revoke, Executive must ensure that written notice is delivered to Anita M. Hill, EVP Human Resources, 3280 Peachtree Road NE, Suite 1600, Atlanta, Georgia 30305, by the end of the day on the seventh calendar day after
Executive signs this Agreement. If Executive does not revoke this Agreement within seven (7) days of signing, this Agreement will become final and binding on the day following such seven (7) day period. 

 This Agreement includes a release of all known and unknown claims through the date of this Agreement. Executive
should carefully consider all of its provisions before signing it. Executive’s signature below indicates Executive’s understanding and agreement with all of the terms in this Agreement. 

 

											
									Atlantic Capital Bancshares, Inc.
						
	Date:								By:		  

											
						
									Full Name:		
									Title:		
					
									Atlantic Capital Bank, N.A.

											
						
	Date:								By:		  

											
						
									Full Name:		
									Title:		
					
	Date:								  

									Executive

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