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Stock Options and Restricted Shares - Common Stock Options (Details) - Common stock options
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Number    
Outstanding, beginning balance (in shares) 101,769  
Granted (in shares) 0  
Exercised (in shares) (31,451)  
Forfeited (in shares) (497)  
Outstanding, ending balance (in shares) 69,821 101,769
Additional disclosures    
Options exercisable (in shares) 69,821  
Weighted-average exercise price of options outstanding (in dollars per share) | $ / shares $ 23.97 $ 23.46
Weighted-average contractual remaining term for options outstanding 1 year 3 months 10 days 1 year 10 months 9 days
Aggregate intrinsic value | $ $ 4,895 [1] $ 4,169 [2]
Weighted- average exercise price of options exercisable (in dollars per share) | $ / shares $ 23.97  
Weighted-average contractual remaining term for options exercisable 1 year 3 months 10 days  
Aggregate intrinsic value of options exercisable | $ $ 4,895 [1]  
[1] The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted closing price of Pinnacle Financial common stock of $94.08 per common share at September 30, 2021 for the 69,821 options that were in-the-money at September 30, 2021.
[2] The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted closing price of Pinnacle Financial common stock of $64.40 per common share at December 31, 2020 for the 101,769 options that were in-the-money at December 31, 2020.