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Employee Benefit Plans - Narrative (Details)
 3 Months Ended
Mar. 31, 2020
USD ($)
plan
shares
Mar. 31, 2019
USD ($)
shares
Defined Benefit Plan Disclosure [Line Items]    
Defined contribution plan, cost recognized $ 251,000 $ 198,000
Number of stock option plans | plan 1  
Direct stock grant expense $ 0  
Deferred Salary Reduction Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Requisite service period 1 year  
Director [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Shares issued (in shares) | shares   3,298
Direct stock grant expense   $ 65,000
Stock Options [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Share-based compensation expense $ 0 31,000
Options, exercises in period, intrinsic value 65,000 $ 81,000
Options, outstanding, intrinsic value 618,000  
Options, exercisable, intrinsic value 618,000  
Proceeds from stock options exercised $ 173,000  
Shares vested (in shares) | shares 0 0
Deferred tax expense from stock options exercised $ 23,000 $ 22,000
Stock Appreciation Rights (SARs) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Share-based compensation expense (118,000) 21,000
Restricted Stock [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Share-based compensation expense 110,000 $ 112,000
Unrecognized compensation costs for non-vested restricted stock $ 1,300,000  
Unrecognized compensation costs, period for recognition 3 years 7 months 2 days  
Grant date fair value of vested restricted stock $ 82,000  
Restricted stock vested (in shares) | shares 4,500 0
2015 Stock Incentive Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Shares issued (in shares) | shares 32,034  
Number of shares available for grant (in shares) | shares 1,883,107  
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 49,250  
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%