Stock Options and Restricted Shares - Unvested Restricted Awards (Details)	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Restricted share awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning of period (in shares)	703,399
Shares awarded	199,791
Restrictions lapsed and shares released to associates/directors (in shares)	(164,428)
Shares forfeited (in shares)	(10,095)
Unvested, end of period (in shares)	728,667
Grant Date Weighted-Average Cost
Unvested, beginning of period (in dollars per share) | $ / shares	$ 77.68
Unvested, end of period (in dollars per share) | $ / shares	$ 80.26
Time Based Awards | Associates
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares awarded	189,901	[1],[2]
Restrictions lapsed and shares released to associates/directors (in shares)	(10)	[1],[2]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Shares Withheld For Taxes By Associates Leadership Team and Directors	15	[1],[2]
Shares forfeited (in shares)	(2,199)	[1],[2],[3]
Unvested, end of period (in shares)	187,677	[1],[2]
Time Based Awards | Associates | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vesting period in years	5 years
Outside Director Awards [Member] | Outside directors
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vesting period in years	1 year	[1],[4]
Shares awarded	9,890	[1],[4]
Restrictions lapsed and shares released to associates/directors (in shares)	0	[1],[4]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Shares Withheld For Taxes By Associates Leadership Team and Directors	0	[1],[4]
Shares forfeited (in shares)	0	[1],[3],[4]
Unvested, end of period (in shares)	9,890	[1],[4]

[1] Groups include employees (referred to as associates above) and outside directors. When the restricted shares are awarded, a participant receives voting rights and forfeitable dividend rights with respect to the shares, but is not able to transfer the shares until the restrictions have lapsed. Once the restrictions lapse, the participant is taxed on the value of the award and may elect to sell some shares (or have Pinnacle Financial withhold some shares) to pay the applicable income taxes associated with the award. Alternatively, the recipient can pay the withholding taxes in cash. For time-based vesting restricted share awards, dividends paid on shares for which the forfeiture restrictions do not lapse will be recouped by Pinnacle Financial at the time of termination. For awards to Pinnacle Financial's directors, dividends are placed into escrow until the forfeiture restrictions on such shares lapse.

[2] The forfeiture restrictions on these restricted share awards lapse in equal annual installments on the anniversary date of the grant.

[3] These shares represent forfeitures resulting from recipients whose employment was terminated during the year-to-date period ended March 31, 2024. Any dividends paid on shares for which the forfeiture restrictions do not lapse will be recouped by Pinnacle Financial at the time of termination or will not be distributed from escrow, as applicable.

[4] Restricted share awards are issued to the outside members of the board of directors in accordance with their board compensation plan. Restrictions lapse on March 1, 2025 based on each individual board member meeting attendance goals for the various board and board committee meetings to which each member was scheduled to attend.