Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 22, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2020
Entity File Number	000-31225
Entity Registrant Name	Pinnacle Financial Partners Inc.
Entity Tax Identification Number	62-1812853
Entity Central Index Key	0001115055
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 3,092,217,712
Entity Common Stock, Shares Outstanding		75,991,557
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Incorporation, State or Country Code	TN
Entity Address, Address Line One	150 Third Avenue South, Suite 900,
Entity Address, City or Town	Nashville,
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37201
City Area Code	(615)
Local Phone Number	744-3700
Entity Interactive Data Current	Yes
Document Annual Report	true
Document Transition Report	false
Common Class A
Cover [Abstract]
Title of 12(b) Security	Common Stock, par value $1.00
Trading Symbol	PNFP
Security Exchange Name	NASDAQ
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $1.00
Trading Symbol	PNFP
Security Exchange Name	NASDAQ
Noncumulative Preferred Stock
Cover [Abstract]
Title of 12(b) Security	Depositary Shares (each representing 1/40th interest in a share of 6.75% Fixed-Rate Non-Cumulative Perpetual Preferred Stock, Series B)
Trading Symbol	PNFPP
Security Exchange Name	NASDAQ
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares (each representing 1/40th interest in a share of 6.75% Fixed-Rate Non-Cumulative Perpetual Preferred Stock, Series B)
Trading Symbol	PNFPP
Security Exchange Name	NASDAQ