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Employee Benefit Plans - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) plan shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 shares
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	$ 307	$ 217	$ 558	$ 415
Number of stock option plans | plan			1
Shares vested (in shares) | shares			0		0
Deferred tax expense from stock options exercised	2	5	$ 22	27
Unrecognized compensation costs for non-vested restricted stock	0		0
Stock Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based compensation expense		31	0	62
Options, exercises in period, intrinsic value	2	32	66	112
Options, outstanding, intrinsic value	732		732
Proceeds from stock options exercised			178
Stock Appreciation Rights (SARs) [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based compensation expense	92	60	(26)	80
Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based compensation expense	114	$ 102	223	$ 214
Unrecognized compensation costs for non-vested restricted stock	$ 1,200		$ 1,200
Unrecognized compensation costs, period for recognition			3 years 4 months 9 days
Grant date fair value of vested restricted stock			$ 105
Restricted stock vested (in shares) | shares			5,500
2015 Stock Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares issued (in shares) | shares			30,599
Number of shares available for grant (in shares) | shares	1,882,689		1,882,689
Legacy Cornerstone Bancshares, Inc. Long-Term Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares issued (in shares) | shares			38,250
Cornerstone Non-Qualified Plan Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares issued (in shares) | shares			48,750
Legacy Capstone Stock Option Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares issued (in shares) | shares			2,266
401 (k) Matching Range One [Member] | Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
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%

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