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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, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Number    
Outstanding, beginning balance (in shares) 176,709  
Granted (in shares) 0  
Exercised (in shares) (10,285)  
Forfeited (in shares) 0  
Outstanding, ending balance (in shares) 166,424 176,709
Weighted-Average Exercise Price    
Outstanding, beginning balance (in dollars per share) | $ / shares $ 22.77  
Outstanding, ending balance (in dollars per share) | $ / shares $ 22.69 $ 22.77
Additional disclosures    
Options exercisable (in shares) 166,424  
Weighted- average exercise price of options exercisable (in dollars per share) | $ / shares $ 22.69  
Weighted-average contractual remaining term for options outstanding 2 years 6 months 14 days 2 years 2 months 23 days
Weighted-average contractual remaining term for options exercisable 2 years 6 months 14 days  
Aggregate intrinsic value | $ $ 5,732 [1] $ 4,123 [2]
Aggregate intrinsic value of options exercisable | $ $ 5,732 [1]  
Quoted closing price of common stock (in dollars per share) | $ / shares $ 56.75 $ 46.10
Number of awards used in aggregate intrinsic value (in shares) 166,424 176,709
[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 $56.75 per common share at September 30, 2019 for the 166,424 options that were in-the-money at September 30, 2019.
[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 $46.10 per common share at December 31, 2018 for the 176,709 options that were in-the-money at December 31, 2018.