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Regulatory Matters (Details)
$ / shares in Units, shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
Jun. 30, 2020
shares
Sep. 30, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
Dec. 31, 2022
$ / shares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Preceding period of retained earnings used in calculation of dividend payable     2 years    
Retained earnings $ 3,579,862,000   $ 3,579,862,000 $ 3,175,777,000  
Quarterly common stock dividend (in dollar per share) | $ / shares $ 0.24   $ 0.24   $ 0.22
Depositary Shares | shares   9,000      
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ / shares $ 16.88        
Preferred Stock, Dividend Per Depositary Share $ 0.422        
Pinnacle Financial          
Actual          
Total capital to risk weighted assets 5,898,518,000   $ 5,898,518,000 5,515,492,000  
Tier I capital to risk weighted assets 5,150,632,000   5,150,632,000 4,751,357,000  
Common equity Tier 1 capital to risk weighted assets 4,933,383,000   4,933,383,000 4,534,108,000  
Tier I capital to average assets [1] $ 5,150,632,000   $ 5,150,632,000 $ 4,751,357,000  
Actual          
Total capital to risk weighted assets (as percent) 0.129   0.129 0.131  
Tier I capital to risk weighted assets (as percent) 0.113   0.113 0.113  
Common equity Tier 1 capital to risk weighted assets 0.108   0.108 0.108  
Tier I capital to average assets (as percent) [1] 0.096   0.096 0.096  
Minimum Capital Requirement          
Total capital to risk weighted assets $ 3,645,705,000   $ 3,645,705,000 $ 3,358,116,000  
Tier I capital to risk weighted assets 2,734,278,000   2,734,278,000 2,518,587,000  
Common equity Tier 1 capital to risk weighted assets 2,050,709,000   2,050,709,000 1,888,940,000  
Tier I capital to average assets [1] $ 2,152,066,000   $ 2,152,066,000 $ 1,989,495,000  
Minimum Capital Requirement          
Total capital to risk weighted assets (as percent) 0.080   0.080 0.080  
Tier I capital to risk weighted assets (as percent) 0.060   0.060 0.060  
Common Equity Tier I capital to risk weighted assets (as percent) 0.045   0.045 0.045  
Tier I capital to average assets (as percent) [1] 0.040   0.040 0.040  
Minimum To Be Well-Capitalized (1)          
Total capital to risk weighted assets $ 4,557,131,000   $ 4,557,131,000 $ 4,197,645,000 [2]  
Tier I capital to risk weighted assets [2] $ 2,734,278,000   $ 2,734,278,000 $ 2,518,587,000  
Minimum To Be Well-Capitalized (1)          
Total capital to risk weighted assets (as percent) 0.100   0.100 0.100 [2]  
Tier I capital to risk weighted assets (as percent) [2] 0.060   0.060 0.060  
Pinnacle Bank          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Cash dividends paid to Pinnacle Financial by Pinnacle Bank     $ 91,500,000    
Retained earnings $ 1,300,000,000   1,300,000,000    
Actual          
Total capital to risk weighted assets 5,684,596,000   5,684,596,000 $ 5,246,472,000  
Tier I capital to risk weighted assets 5,245,710,000   5,245,710,000 4,851,336,000  
Common equity Tier 1 capital to risk weighted assets 5,245,588,000   5,245,588,000 4,851,213,000  
Tier I capital to average assets [1] $ 5,245,710,000   $ 5,245,710,000 $ 4,851,336,000  
Actual          
Total capital to risk weighted assets (as percent) 0.125   0.125 0.125  
Tier I capital to risk weighted assets (as percent) 0.115   0.115 0.116  
Common equity Tier 1 capital to risk weighted assets 0.115   0.115 0.116  
Tier I capital to average assets (as percent) [1] 0.098   0.098 0.098  
Minimum Capital Requirement          
Total capital to risk weighted assets $ 3,640,273,000   $ 3,640,273,000 $ 3,352,352,000  
Tier I capital to risk weighted assets 2,730,205,000   2,730,205,000 2,514,264,000  
Common equity Tier 1 capital to risk weighted assets 2,047,653,000   2,047,653,000 1,885,698,000  
Tier I capital to average assets [1] $ 2,148,674,000   $ 2,148,674,000 $ 1,984,252,000  
Minimum Capital Requirement          
Total capital to risk weighted assets (as percent) 0.080   0.080 0.080  
Tier I capital to risk weighted assets (as percent) 0.060   0.060 0.060  
Common Equity Tier I capital to risk weighted assets (as percent) 0.045   0.045 0.045  
Tier I capital to average assets (as percent) [1] 0.040   0.040 0.040  
Minimum To Be Well-Capitalized (1)          
Total capital to risk weighted assets $ 4,550,341,000   $ 4,550,341,000 $ 4,190,440,000 [2]  
Tier I capital to risk weighted assets [2] 3,640,273,000   3,640,273,000 3,352,352,000  
Common equity Tier 1 capital to risk weighted assets [2] 2,957,722,000   2,957,722,000 2,723,786,000  
Tier I capital to average assets [1],[2] $ 2,685,842,000   $ 2,685,842,000 $ 2,480,315,000  
Minimum To Be Well-Capitalized (1)          
Total capital to risk weighted assets (as percent) 0.100   0.100 0.100 [2]  
Tier I capital to risk weighted assets (as percent) [2] 0.080   0.080 0.080  
Common Equity Tier I capital to risk weighted assets (as percent) [2] 0.065   0.065 0.065  
Tier I capital to average assets (as percent) [1],[2] 0.050   0.050 0.050  
[1]
(*) Average assets for the above calculations were based on the most recent quarter.
[2] Well-capitalized minimum Common equity Tier 1 capital to risk weighted assets and Tier 1 capital to average assets are not formally defined under applicable banking regulations for bank holding companies.