Regulatory Matters (Details) $ / shares in Units, shares in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022 USD ($) $ / shares	Jun. 30, 2020 shares	Jun. 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		$ 2,096,950,000		$ 2,096,950,000	$ 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		4,289,120,000		$ 4,289,120,000	$ 4,060,598,000
Tier I capital to risk weighted assets		3,622,608,000		3,622,608,000	3,425,751,000
Common equity Tier 1 capital to risk weighted assets		3,405,359,000		3,405,359,000	3,208,503,000
Tier I capital to average assets	[1]	$ 3,622,608,000		$ 3,622,608,000	$ 3,425,751,000
Actual
Total capital to risk weighted assets (as percent)		0.129		0.129	0.138
Tier I capital to risk weighted assets (as percent)		0.109		0.109	0.117
Common equity Tier 1 capital to risk weighted assets		0.102		0.102	0.109
Tier I capital to average assets (as percent)	[1]	0.098		0.098	0.097
Minimum Capital Requirement
Total capital to risk weighted assets		$ 2,669,286,000		$ 2,669,286,000	$ 2,347,963,000
Tier I capital to risk weighted assets		2,001,964,000		2,001,964,000	1,760,972,000
Common equity Tier 1 capital to risk weighted assets		1,501,473,000		1,501,473,000	1,320,729,000
Tier I capital to average assets	[1]	$ 1,485,542,000		$ 1,485,542,000	$ 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		$ 3,336,607,000		$ 3,336,607,000	$ 2,934,953,000
Tier I capital to risk weighted assets		$ 2,669,286,000		$ 2,669,286,000	$ 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				$ 49,600,000
Retained earnings		$ 806,000,000		806,000,000
Actual
Total capital to risk weighted assets		3,877,155,000		3,877,155,000	$ 3,670,111,000
Tier I capital to risk weighted assets		3,639,643,000		3,639,643,000	3,464,265,000
Common equity Tier 1 capital to risk weighted assets		3,639,521,000		3,639,521,000	3,464,142,000
Tier I capital to average assets	[1]	$ 3,639,643,000		$ 3,639,643,000	$ 3,464,265,000
Actual
Total capital to risk weighted assets (as percent)		0.117		0.117	0.126
Tier I capital to risk weighted assets (as percent)		0.110		0.110	0.119
Common equity Tier 1 capital to risk weighted assets		0.110		0.110	0.119
Tier I capital to average assets (as percent)	[1]	0.099		0.099	0.099
Minimum Capital Requirement
Total capital to risk weighted assets		$ 2,651,969,000		$ 2,651,969,000	$ 2,334,243,000
Tier I capital to risk weighted assets		1,988,976,000		1,988,976,000	1,750,683,000
Common equity Tier 1 capital to risk weighted assets		1,491,732,000		1,491,732,000	1,313,012,000
Tier I capital to average assets	[1]	$ 1,477,760,000		$ 1,477,760,000	$ 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		$ 3,314,961,000		$ 3,314,961,000	$ 2,917,804,000
Tier I capital to risk weighted assets		2,651,969,000		2,651,969,000	2,334,243,000
Common equity Tier 1 capital to risk weighted assets		2,154,724,000		2,154,724,000	1,896,573,000
Tier I capital to average assets	[1]	$ 1,847,200,000		$ 1,847,200,000	$ 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.