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Regulatory Matters (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 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 $ 1,002,434 $ 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 $ 78,700  
Actual    
Total capital to risk weighted assets 2,729,341 2,580,143
Tier I capital to risk weighted assets 2,168,431 2,024,193
Common Equity Tier I capital to risk weighted assets 2,168,308 2,024,070
Tier I capital to average assets [1] $ 2,168,431 $ 2,024,193
Actual    
Total capital to risk weighted assets (as percent) 12.00% 12.20%
Tier I capital to risk weighted assets (as percent) 9.50% 9.60%
Common Equity Tier I capital to risk weighted assets (as percent) 9.50% 9.60%
Tier I capital to average assets (as percent) [1] 9.10% 8.90%
Minimum Capital Requirement    
Total capital to risk weighted assets $ 1,821,607 $ 1,691,017
Tier I capital to risk weighted assets 1,366,205 1,268,263
Common Equity Tier I capital 1,024,654 951,197
Tier I capital to average assets [1] $ 957,546 $ 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 $ 608,900  
Actual    
Total capital to risk weighted assets 2,563,617 $ 2,432,419
Tier I capital to risk weighted assets 2,342,892 2,218,003
Common Equity Tier I capital to risk weighted assets 2,342,770 2,217,880
Tier I capital to average assets [1] $ 2,342,892 $ 2,218,003
Actual    
Total capital to risk weighted assets (as percent) 11.30% 11.50%
Tier I capital to risk weighted assets (as percent) 10.30% 10.50%
Common Equity Tier I capital to risk weighted assets (as percent) 10.30% 10.50%
Tier I capital to average assets (as percent) [1] 9.80% 9.80%
Minimum Capital Requirement    
Total capital to risk weighted assets $ 1,816,521 $ 1,686,046
Tier I capital to risk weighted assets 1,362,391 1,264,535
Common Equity Tier I capital 1,021,793 948,401
Tier I capital to average assets [1] $ 955,401 $ 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    
Total capital to risk weighted assets $ 2,270,651 $ 2,107,558
Tier I capital to risk weighted assets 1,816,521 1,686,046
Common Equity Tier I capital to risk weighted assets 1,475,923 1,369,912
Tier I capital to average assets [1] $ 1,194,252 $ 1,132,731
Minimum To Be Well-Capitalized    
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.