Defined Contribution Plan, Requisite Service Period

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- Definition

Percentage of fourth anniversary of grant date.

+ References

No definition available.

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- Definition

Percentage of incentive stock options vested on second anniversary of grant date.

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- Definition

Percentage of incentive of third anniversary of grant date.

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- Definition

Percentage of non qualified stock options vested on first anniversary of grant date.

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- Definition

Percentage of non qualified stock options vested on second anniversaries of grant date.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Inactive Stock Option Plans With Outstanding Grants

+ References

No definition available.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Stock Option Plans

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- Definition

Share-based Compensation Arrangement, Ownership Percentage by Individual

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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.

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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.

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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.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount of cost for defined contribution plan.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

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No definition available.

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Employee Benefit Plans (Textual) (Details)			12 Months Ended
Employee Benefit Plans (Textual) (Details)	Jan. 25, 2018 $ / shares shares	Aug. 04, 2017 $ / shares shares	Dec. 31, 2018 USD ($) plan shares	Dec. 31, 2017 USD ($) shares
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.
Number of stock option plans \| plan			1
Number of inactive stock option plans with outstanding grants \| plan			4
Share-based compensation expense			$ 133,884	$ 97,966
Options vested in period, fair value			243,831	313,977
Deferred tax expense from stock options exercised			318,826	1,331,689
Options, exercises in period, intrinsic value			1,523,014	$ 5,468,780
Options, outstanding, intrinsic value			1,307,043
Options, exercisable, intrinsic value			1,263,872
Proceeds from stock options exercised			$ 1,519,244
Number of shares granted (in shares) \| shares			0	0
Director [Member]
Defined Benefit Plan Disclosure [Line Items]
Direct stock grant expense			$ 9,062	$ 31,791
Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized			715,698	427,975
Stock Appreciation Rights (SARs) [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based compensation expense			33,916	21,829
Stock Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized compensation costs			$ 124,450
Unrecognized compensation costs, period for recognition			1 year
Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of shares granted (in shares) \| shares			7,553
Vested (in shares) \| shares			5,553
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%
2015 Stock Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Exercise price, not less than (as a percent)			110.00%
Number outstanding (in shares) \| 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%
2015 Stock Incentive Plan [Member] \| Nonstatutory Stock Option [Member]
Defined Benefit Plan Disclosure [Line Items]
Exercise price, not less than (as a percent)			100.00%
2015 Stock Incentive Plan [Member] \| Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based compensation expense			$ 263,013	$ 56,330
Number of shares granted (in shares) \| shares	7,553	27,500
Grant date fair value (in dollars per share) \| $ / shares	$ 21.61	$ 24.58
Unrecognized compensation cost			$ 519,727
Legacy Capstone Stock Option Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Exercise price, not less than (as a percent)			100.00%
401 (k) Matching Range One [Member] \| Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Request service period			1 year
Employer matching contribution, percent of match			100.00%
Employer matching contribution, percent of employees gross pay			3.00%
401 (k) Matching Range Two [Member] \| Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent of match			50.00%
Employer matching contribution, percent of employees gross pay			2.00%
Share-based Compensation Award, Tranche Three [Member] \| 2015 Stock Incentive Plan [Member] \| Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of option to participants with more than ten percent voting power			5 years
Vested (in shares) \| shares	2,000
Share-based Compensation Award, Tranche Two [Member] \| 2015 Stock Incentive Plan [Member] \| Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of option to participants with more than ten percent voting power			6 months
Share-based Compensation Award, Tranche Two [Member] \| 2015 Stock Incentive Plan [Member] \| Restricted Stock [Member] \| Director [Member]
Defined Benefit Plan Disclosure [Line Items]
Vested (in shares) \| shares	926
Share-based Compensation Award, Tranche One [Member] \| 2015 Stock Incentive Plan [Member] \| Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Vested (in shares) \| shares	4,627