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Regulatory Matters (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
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 $ 1,100,517 $ 833,130
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 $ 96,300  
Actual    
Total capital to risk weighted assets 3,093,547 2,580,143
Tier I capital to risk weighted assets 2,238,535 2,024,193
Common Equity Tier I capital to risk weighted assets 2,238,413 2,024,070
Tier I capital to average assets [1] $ 2,238,535 $ 2,024,193
Actual    
Total capital to risk weighted assets (as percent) 13.20% 12.20%
Tier I capital to risk weighted assets (as percent) 9.60% 9.60%
Common Equity Tier I capital to risk weighted assets (as percent) 9.60% 9.60%
Tier I capital to average assets (as percent) [1] 8.90% 8.90%
Minimum Capital Requirement    
Total capital to risk weighted assets $ 1,874,904 $ 1,691,017
Tier I capital to risk weighted assets 1,406,178 1,268,263
Common Equity Tier I capital 1,054,634 951,197
Tier I capital to average assets [1] $ 1,003,329 $ 909,102
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) [1] 4.00% 4.00%
Pinnacle Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Retained earnings $ 617,500  
Actual    
Total capital to risk weighted assets 2,818,988 $ 2,432,419
Tier I capital to risk weighted assets 2,592,976 2,218,003
Common Equity Tier I capital to risk weighted assets 2,592,854 2,217,880
Tier I capital to average assets [1] $ 2,592,976 $ 2,218,003
Actual    
Total capital to risk weighted assets (as percent) 12.10% 11.50%
Tier I capital to risk weighted assets (as percent) 11.10% 10.50%
Common Equity Tier I capital to risk weighted assets (as percent) 11.10% 10.50%
Tier I capital to average assets (as percent) [1] 10.40% 9.80%
Minimum Capital Requirement    
Total capital to risk weighted assets $ 1,869,627 $ 1,686,046
Tier I capital to risk weighted assets 1,402,221 1,264,535
Common Equity Tier I capital 1,051,665 948,401
Tier I capital to average assets [1] $ 998,695 $ 906,185
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) [1] 4.00% 4.00%
Minimum To Be Well-Capitalized Under Prompt Corrective Action Resolutions    
Total capital to risk weighted assets $ 2,337,034 $ 2,107,558
Tier I capital to risk weighted assets 1,869,627 1,686,046
Common Equity Tier I capital to risk weighted assets 1,519,072 1,369,912
Tier I capital to average assets [1] $ 1,248,369 $ 1,132,731
Minimum To Be Well-Capitalized Under Prompt Corrective Action Resolutions    
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) [1] 5.00% 5.00%
[1]
(*) Average assets for the above calculations were based on the most recent quarter.