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Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Deferred compensation arrangements, overall, description | After one year of service the Company matches 100 percent of employee contributions up to 3 percent of compensation and 50 percent of employee contributions on the next 2 percent of compensation. |
Share-based compensation expense | $ 132,635 | $ 140,077
Options vested in period, fair value | 95,658 | 103,604
Deferred tax expense from stock options exercised | 660,567 | 27,738
Options, exercises in period, intrinsic value | 660,476 | 171,574
Options, outstanding, intrinsic value | 6,074,252 |
Options, exercisable, intrinsic value | 5,905,718 |
Proceeds from stock options exercised | $ 803,957 |
Number of shares granted | 0 |
Weighted average grant-date fair value, granted (in dollars per share) | $ 0.00 |
Deferred Salary Reduction Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution plan, cost recognized | $ 403,309 | 219,017
Director [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Direct stock grant expense |  | $ 100,216
Stock Options [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized compensation costs | $ 365,000 |
Unrecognized compensation costs, period for recognition | 4 years |
Weighted average grant-date fair value, granted (in dollars per share) |  | $ 12.31
Legacy Cornerstone Bancshares, Inc. Long-Term Incentive Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Exercise price, not less than (as a percent) | 100.00% |
Smart Bank Stock Option Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Number of shares authorized | 525,000 |
Exercise price, not less than (as a percent) | 100.00% |
Legacy Smart Financial Inc 2010 Incentive Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Number of shares authorized | 525,000 |
Exercise price, not less than (as a percent) | 100.00% |
Stock Incentive Plan Two Thousand Fifteen [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Exercise price, not less than (as a percent) | 110.00% |
Number Outstanding (in shares) | 2,000,000 |
Term of options, no more than | 10 years |
Voting power held by participant (as a percent) | 10.00% |
Term of option to participants with more than ten percent voting power | 5 years |
Percentage Of incentive stock options vesting on second anniversary | 30.00% |
Percentage Of incentive stock options vesting on third anniversary | 30.00% |
Percentage Of incentive stock options vesting on fourth anniversary | 40.00% |
Percentage Of nonqualified stock options vesting on first anniversary | 50.00% |
Percentage Of nonqualified stock options vesting on second anniversary | 50.00% |
401 (k) Matching Range One [Member] | Deferred Salary Reduction Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer matching contribution, percent of employees gross pay | 3.00% |
Employer matching contribution, percent of match | 100.00% |
401 (k) Matching Range Two [Member] | Deferred Salary Reduction Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer matching contribution, percent of employees gross pay | 2.00% |
Employer matching contribution, percent of match | 50.00% |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition General description of deferred compensation arrangements. Deferred compensation represents currently earned compensation that, under the terms of a profit-sharing, rabbi trust, pension, employee contract, or equity-based (including stock or unit option) plan, is not actually paid until a later date and is therefore not taxable until that date. May also include some split-dollar life insurance arrangements. This type of arrangement is usually made to help employees postpone paying taxes on the income and also to retain employees longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Rabbi Trusts -URI http://asc.fasb.org/extlink&oid=6522716 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Endorsement Split-Dollar Life Insurance -URI http://asc.fasb.org/extlink&oid=6511593 + Details
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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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