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Regulatory Matters (Details) - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended	12 Months Ended
		Jun. 30, 2020	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2022
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			$ 3,175,777,000	$ 2,784,927,000
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries			$ 109,900,000
Dividends Payable, Amount Per Share			$ 0.24		$ 0.22
Preferred Stock, Dividend Rate, Per-Dollar-Amount			$ 16.88
Preferred Stock, Dividend Per Depositary Share			$ 0.422
Depositary Shares		9,000
ASU 2016-13 Cumulative Transition Adjustments						$ 68,000,000
Pinnacle Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings			1,300,000,000
Actual Amount
Total capital to risk weighted assets:			5,246,472,000	4,797,278,000
Tier I capital to risk weighted assets:			4,851,336,000	4,465,282,000
Common Equity Tier 1 capital to risk weighted assets:			4,851,213,000	4,465,159,000
Tier I capital to average assets (*):	[1]		$ 4,851,336,000	$ 4,465,282,000
Actual Ratios
Total capital to risk weighted assets:			12.50%	12.00%
Tier I capital to risk weighted assets:			11.60%	11.10%
Common equity Tier 1 capital:			11.60%	11.10%
Tier I capital to average assets (*):	[1]		9.80%	9.70%
Minimum Capital Requirement
Total capital to risk weighted assets:			$ 3,352,352,000	$ 3,207,699,000
Tier I capital to risk weighted assets:			2,514,264,000	2,405,774,000
Common equity Tier 1 capital to risk weighted assets:			1,885,698,000	1,804,330,000
Tier I capital to average assets (*):	[1]		$ 1,984,252,000	$ 1,847,972,000
Minimum Capital Requirement - Ratios
Total capital to risk weighted assets:			8.00%	8.00%
Tier I capital to risk weighted assets:			6.00%	6.00%
Common equity Tier 1 risk based capital to risk weighted assets:			4.50%	4.50%
Tier I capital to average assets (*):	[1]		4.00%	4.00%
Minimum To Be Well Capitalized
Total capital to risk weighted assets:			$ 4,190,440,000	$ 4,009,623,000
Tier I capital to risk weighted assets:			3,352,352,000	3,207,699,000
Common equity Tier 1 capital to risk weighted assets:			2,723,786,000	2,606,255,000
Tier I capital to average assets (*):	[1]		$ 2,480,315,000	$ 2,309,965,000
Minimum To Be Well Capitalized - Ratios
Total capital to risk weighted assets:			10.00%	10.00%
Tier I capital to risk weighted assets:			8.00%	8.00%
Common equity Tier 1 capital to risk weighted assets:			6.50%	6.50%
Tier I capital to average assets (*):	[1]		5.00%	5.00%
Pinnacle Financial
Actual Amount
Total capital to risk weighted assets:			$ 5,515,492,000	$ 5,115,755,000
Tier I capital to risk weighted assets:			4,751,357,000	4,354,759,000
Common Equity Tier 1 capital to risk weighted assets:			4,534,108,000	4,137,510,000
Tier I capital to average assets (*):	[1]		$ 4,751,357,000	$ 4,354,759,000
Actual Ratios
Total capital to risk weighted assets:			13.10%	12.70%
Tier I capital to risk weighted assets:			11.30%	10.80%
Common equity Tier 1 capital:			10.80%	10.30%
Tier I capital to average assets (*):	[1]		9.60%	9.40%
Minimum Capital Requirement
Total capital to risk weighted assets:			$ 3,358,116,000	$ 3,216,424,000
Tier I capital to risk weighted assets:			2,518,587,000	2,412,318,000
Common equity Tier 1 capital to risk weighted assets:			1,888,940,000	1,809,238,000
Tier I capital to average assets (*):	[1]		$ 1,989,495,000	$ 1,853,213,000
Minimum Capital Requirement - Ratios
Total capital to risk weighted assets:			8.00%	8.00%
Tier I capital to risk weighted assets:			6.00%	6.00%
Common equity Tier 1 risk based capital to risk weighted assets:			4.50%	4.50%
Tier I capital to average assets (*):	[1]		4.00%	4.00%
Minimum To Be Well Capitalized
Total capital to risk weighted assets:			$ 4,197,645,000	$ 4,020,530,000
Tier I capital to risk weighted assets:			$ 2,518,587,000	$ 2,412,318,000
Minimum To Be Well Capitalized - Ratios
Total capital to risk weighted assets:			10.00%	10.00%
Tier I capital to risk weighted assets:			6.00%	6.00%
[1] Average assets for the above calculations were based on the most recent quarter.

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