Regulatory Matters (Details) $ / shares in Units, shares in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022 USD ($) $ / shares	Jun. 30, 2020 shares	Sep. 30, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / 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		$ 2,224,736,000		$ 2,224,736,000	$ 1,864,350,000
Quarterly common stock dividend (in dollar per share) | $ / shares		$ 0.22		$ 0.22	$ 0.18
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		4,445,393,000		$ 4,445,393,000	$ 4,060,598,000
Tier I capital to risk weighted assets		3,762,311,000		3,762,311,000	3,425,751,000
Common equity Tier 1 capital to risk weighted assets		3,545,062,000		3,545,062,000	3,208,503,000
Tier I capital to average assets	[1]	$ 3,762,311,000		$ 3,762,311,000	$ 3,425,751,000
Actual
Total capital to risk weighted assets (as percent)		0.126		0.126	0.138
Tier I capital to risk weighted assets (as percent)		0.107		0.107	0.117
Common equity Tier 1 capital to risk weighted assets		0.100		0.100	0.109
Tier I capital to average assets (as percent)	[1]	0.097		0.097	0.097
Minimum Capital Requirement
Total capital to risk weighted assets		$ 2,822,505,000		$ 2,822,505,000	$ 2,347,963,000
Tier I capital to risk weighted assets		2,116,879,000		2,116,879,000	1,760,972,000
Common equity Tier 1 capital to risk weighted assets		1,587,659,000		1,587,659,000	1,320,729,000
Tier I capital to average assets	[1]	$ 1,555,559,000		$ 1,555,559,000	$ 1,412,747,000
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
Total capital to risk weighted assets		$ 3,528,132,000		$ 3,528,132,000	$ 2,934,953,000
Tier I capital to risk weighted assets		$ 2,822,505,000		$ 2,822,505,000	$ 2,347,963,000
Minimum To Be Well-Capitalized
Total capital to risk weighted assets (as percent)		0.100		0.100	0.100
Tier I capital to risk weighted assets (as percent)		0.080		0.080	0.080
Pinnacle Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid to Pinnacle Financial by Pinnacle Bank				$ 75,000,000
Retained earnings		$ 929,100,000		929,100,000
Actual
Total capital to risk weighted assets		4,155,586,000		4,155,586,000	$ 3,670,111,000
Tier I capital to risk weighted assets		3,901,504,000		3,901,504,000	3,464,265,000
Common equity Tier 1 capital to risk weighted assets		3,901,381,000		3,901,381,000	3,464,142,000
Tier I capital to average assets	[1]	$ 3,901,504,000		$ 3,901,504,000	$ 3,464,265,000
Actual
Total capital to risk weighted assets (as percent)		0.118		0.118	0.126
Tier I capital to risk weighted assets (as percent)		0.111		0.111	0.119
Common equity Tier 1 capital to risk weighted assets		0.111		0.111	0.119
Tier I capital to average assets (as percent)	[1]	0.101		0.101	0.099
Minimum Capital Requirement
Total capital to risk weighted assets		$ 2,815,240,000		$ 2,815,240,000	$ 2,334,243,000
Tier I capital to risk weighted assets		2,111,430,000		2,111,430,000	1,750,683,000
Common equity Tier 1 capital to risk weighted assets		1,583,572,000		1,583,572,000	1,313,012,000
Tier I capital to average assets	[1]	$ 1,547,192,000		$ 1,547,192,000	$ 1,406,063,000
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
Total capital to risk weighted assets		$ 3,519,050,000		$ 3,519,050,000	$ 2,917,804,000
Tier I capital to risk weighted assets		2,815,240,000		2,815,240,000	2,334,243,000
Common equity Tier 1 capital to risk weighted assets		2,287,382,000		2,287,382,000	1,896,573,000
Tier I capital to average assets	[1]	$ 1,933,990,000		$ 1,933,990,000	$ 1,757,578,000
Minimum To Be Well-Capitalized
Total capital to risk weighted assets (as percent)		0.100		0.100	0.100
Tier I capital to risk weighted assets (as percent)		0.080		0.080	0.080
Common Equity Tier I capital to risk weighted assets (as percent)		0.065		0.065	0.065
Tier I capital to average assets (as percent)	[1]	0.050		0.050	0.050

[1] (*) Average assets for the above calculations were based on the most recent quarter.