Stock Options and Restricted Shares - Common Stock Options (Details) - Common stock options - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Number
Outstanding, beginning balance (in shares)	40,188
Granted (in shares)	0
Exercised (in shares)	(40,188)
Forfeited (in shares)	0
Outstanding, ending balance (in shares)	0	40,188
Additional disclosures
Options exercisable (in shares)	0
Weighted-average exercise price of options outstanding (in dollars per share)	$ 0	$ 25.00
Weighted-average contractual remaining term for options outstanding	0 years	3 months 29 days
Aggregate intrinsic value	$ 0	$ 1,945	[1]
Weighted- average exercise price of options exercisable (in dollars per share)	$ 0
Weighted-average contractual remaining term for options exercisable	0 years
Aggregate intrinsic value of options exercisable	$ 0

[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 $73.40 per common share at December 31, 2022 for the 40,188 options that were in-the-money at December 31, 2022.