Regulatory Matters (Details) $ / shares in Units, shares in Thousands		3 Months Ended
		Mar. 31, 2023 USD ($) $ / shares	Dec. 31, 2020 shares	Dec. 31, 2022 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		$ 2,458,006,000		$ 2,341,706,000
Quarterly common stock dividend (in dollar per share) | $ / shares		$ 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		4,720,387,000		$ 4,584,292,000
Tier I capital to risk weighted assets		3,992,847,000		3,888,100,000
Common equity Tier 1 capital to risk weighted assets		3,775,599,000		3,670,851,000
Tier I capital to average assets	[1]	$ 3,992,847,000		$ 3,888,100,000
Actual
Total capital to risk weighted assets (as percent)		0.124		0.124
Tier I capital to risk weighted assets (as percent)		0.105		0.105
Common equity Tier 1 capital to risk weighted assets		0.099		0.100
Tier I capital to average assets (as percent)	[1]	0.096		0.097
Minimum Capital Requirement
Total capital to risk weighted assets		$ 3,049,413,000		$ 2,949,276,000
Tier I capital to risk weighted assets		2,287,060,000		2,211,957,000
Common equity Tier 1 capital to risk weighted assets		1,715,295,000		1,658,968,000
Tier I capital to average assets	[1]	$ 1,660,651,000		$ 1,595,457,000
Minimum Capital Requirement
Total capital to risk weighted assets (as percent)		0.080		0.080
Tier I capital to risk weighted assets (as percent)		0.060		0.060
Common Equity Tier I capital to risk weighted assets (as percent)		0.045		0.045
Tier I capital to average assets (as percent)	[1]	0.040		0.040
Minimum To Be Well-Capitalized (1)
Total capital to risk weighted assets		$ 3,811,766,000		$ 3,686,595,000
Tier I capital to risk weighted assets		$ 2,287,060,000		$ 2,211,957,000
Minimum To Be Well-Capitalized (1)
Total capital to risk weighted assets (as percent)		0.100		0.100
Tier I capital to risk weighted assets (as percent)		0.060		0.060
Pinnacle Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid to Pinnacle Financial by Pinnacle Bank		$ 26,300,000
Retained earnings		981,700,000
Actual
Total capital to risk weighted assets		4,417,066,000		$ 4,282,742,000
Tier I capital to risk weighted assets		4,118,526,000		4,015,550,000
Common equity Tier 1 capital to risk weighted assets		4,118,404,000		4,015,427,000
Tier I capital to average assets	[1]	$ 4,118,526,000		$ 4,015,550,000
Actual
Total capital to risk weighted assets (as percent)		0.116		0.116
Tier I capital to risk weighted assets (as percent)		0.108		0.109
Common equity Tier 1 capital to risk weighted assets		0.108		0.109
Tier I capital to average assets (as percent)	[1]	0.099		0.101
Minimum Capital Requirement
Total capital to risk weighted assets		$ 3,041,133,000		$ 2,941,082,000
Tier I capital to risk weighted assets		2,280,849,000		2,205,812,000
Common equity Tier 1 capital to risk weighted assets		1,710,637,000		1,654,359,000
Tier I capital to average assets	[1]	$ 1,656,143,000		$ 1,591,502,000
Minimum Capital Requirement
Total capital to risk weighted assets (as percent)		0.080		0.080
Tier I capital to risk weighted assets (as percent)		0.060		0.060
Common Equity Tier I capital to risk weighted assets (as percent)		0.045		0.045
Tier I capital to average assets (as percent)	[1]	0.040		0.040
Minimum To Be Well-Capitalized (1)
Total capital to risk weighted assets		$ 3,801,416,000		$ 3,676,353,000
Tier I capital to risk weighted assets		3,041,133,000		2,941,082,000
Common equity Tier 1 capital to risk weighted assets		2,470,920,000		2,389,629,000
Tier I capital to average assets	[1]	$ 2,070,179,000		$ 1,989,378,000
Minimum To Be Well-Capitalized (1)
Total capital to risk weighted assets (as percent)		0.100		0.100
Tier I capital to risk weighted assets (as percent)		0.080		0.080
Common Equity Tier I capital to risk weighted assets (as percent)		0.065		0.065
Tier I capital to average assets (as percent)	[1]	0.050		0.050

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