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Regulatory Matters (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
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 $ 1,168,301 $ 1,184,183
Quarterly common stock dividend (in dollar per share) $ 0.16  
Pinnacle Financial    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Cash dividends paid to Pinnacle Financial by Pinnacle Bank $ 44,100  
Actual    
Total capital to risk weighted assets 3,158,818 3,159,375
Tier I capital to risk weighted assets 2,311,306 2,319,234
Common Equity Tier I capital to risk weighted assets 2,311,184 2,319,112
Tier I capital to average assets $ 2,311,306 [1] $ 2,319,234
Actual    
Total capital to risk weighted assets (as percent) 12.80% 13.20%
Tier I capital to risk weighted assets (as percent) 9.40% 9.70%
Common Equity Tier I capital to risk weighted assets (as percent) 9.40% 9.70%
Tier I capital to average assets (as percent) 8.80% [1] 9.10%
Minimum Capital Requirement    
Total capital to risk weighted assets $ 1,973,843 $ 1,912,885
Tier I capital to risk weighted assets 1,480,382 1,434,664
Common Equity Tier I capital 1,110,287 1,075,998
Tier I capital to average assets $ 1,048,902 [1] $ 1,021,836
Minimum Capital Requirement    
Total capital to risk weighted assets (as percent) 8.00% 8.00%
Tier I capital to risk weighted assets (as percent) 6.00% 6.00%
Common Equity Tier I capital to risk weighted assets (as percent) 4.50% 4.50%
Tier I capital to average assets (as percent) 4.00% [1] 4.00%
Minimum To Be Well-Capitalized Under Prompt Corrective Action Regulations    
Total capital to risk weighted assets $ 2,467,303 $ 2,391,106
Tier I capital to risk weighted assets $ 1,973,843 $ 1,912,885
Minimum To Be Well-Capitalized Under Prompt Corrective Action Regulations    
Total capital to risk weighted assets (as percent) 10.00% 10.00%
Tier I capital to risk weighted assets (as percent) 8.00% 8.00%
Pinnacle Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Retained earnings $ 571,300  
Actual    
Total capital to risk weighted assets 2,993,005 $ 2,906,853
Tier I capital to risk weighted assets 2,694,493 2,679,713
Common Equity Tier I capital to risk weighted assets 2,694,370 2,679,590
Tier I capital to average assets $ 2,694,493 [1] $ 2,679,713
Actual    
Total capital to risk weighted assets (as percent) 12.20% 12.20%
Tier I capital to risk weighted assets (as percent) 11.00% 11.20%
Common Equity Tier I capital to risk weighted assets (as percent) 11.00% 11.20%
Tier I capital to average assets (as percent) 10.30% [1] 10.50%
Minimum Capital Requirement    
Total capital to risk weighted assets $ 1,968,039 $ 1,906,839
Tier I capital to risk weighted assets 1,476,029 1,430,129
Common Equity Tier I capital 1,107,022 1,072,597
Tier I capital to average assets $ 1,047,399 [1] $ 1,019,210
Minimum Capital Requirement    
Total capital to risk weighted assets (as percent) 8.00% 8.00%
Tier I capital to risk weighted assets (as percent) 6.00% 6.00%
Common Equity Tier I capital to risk weighted assets (as percent) 4.50% 4.50%
Tier I capital to average assets (as percent) 4.00% [1] 4.00%
Minimum To Be Well-Capitalized Under Prompt Corrective Action Regulations    
Total capital to risk weighted assets $ 2,460,049 $ 2,383,549
Tier I capital to risk weighted assets 1,968,039 1,906,839
Common Equity Tier I capital to risk weighted assets 1,599,032 1,549,307
Tier I capital to average assets $ 1,309,248 [1] $ 1,274,012
Minimum To Be Well-Capitalized Under Prompt Corrective Action Regulations    
Total capital to risk weighted assets (as percent) 10.00% 10.00%
Tier I capital to risk weighted assets (as percent) 8.00% 8.00%
Common Equity Tier I capital to risk weighted assets (as percent) 6.50% 6.50%
Tier I capital to average assets (as percent) 5.00% [1] 5.00%
[1] (*) Average assets for the above calculations were based on the most recent quarter.