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Stock Options and Restricted Shares - Common Stock Options (Details) - Common stock options - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Number    
Outstanding, beginning balance (in shares) 101,769  
Granted (in shares) 0  
Exercised (in shares) (13,246)  
Forfeited (in shares) 0  
Outstanding, ending balance (in shares) 88,523 101,769
Additional disclosures    
Options exercisable (in shares) 88,523  
Weighted-average exercise price of options outstanding (in dollars per share) $ 23.53 $ 23.46
Weighted-average contractual remaining term for options outstanding 1 year 7 months 17 days 1 year 10 months 9 days
Aggregate intrinsic value $ 5,766 [1] $ 4,169 [2]
Weighted- average exercise price of options exercisable (in dollars per share) $ 23.53  
Weighted-average contractual remaining term for options exercisable 1 year 7 months 17 days  
Aggregate intrinsic value of options exercisable [1] $ 5,766  
Quoted closing price of common stock (in dollars per share) $ 88.66 $ 64.40
Number of awards used in aggregate intrinsic value (in shares) 88,523 101,769
[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 $88.66 per common share at March 31, 2021 for the 88,523 options that were in-the-money at March 31, 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.