Other borrowings (Details) $ in Thousands		9 Months Ended
		Sep. 30, 2023 USD ($) subsidiary	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Number of wholly owned subsidiaries | subsidiary		12
Term		30 years
Total Debt Outstanding		$ 424,718	$ 424,055
Debt issuance costs and fair value adjustments		$ (8,277)
Pinnacle Statutory Trust I
Debt Instrument [Line Items]
Date Established		Dec. 29, 2003
Maturity		Dec. 30, 2033
Total Debt Outstanding		$ 10,310
Interest Rate (as percent)	[1]	8.47%
Coupon Structure at September 30, 2023		3-month SOFR + 2.80% (1)
Pinnacle Statutory Trust II
Debt Instrument [Line Items]
Date Established		Sep. 15, 2005
Maturity		Sep. 30, 2035
Total Debt Outstanding		$ 20,619
Interest Rate (as percent)	[1]	7.06%
Coupon Structure at September 30, 2023		3-month SOFR + 1.40% (1)
Pinnacle Statutory Trust III
Debt Instrument [Line Items]
Date Established		Sep. 07, 2006
Maturity		Sep. 30, 2036
Total Debt Outstanding		$ 20,619
Interest Rate (as percent)	[1]	7.31%
Coupon Structure at September 30, 2023		3-month SOFR + 1.65% (1)
Pinnacle Statutory Trust IV
Debt Instrument [Line Items]
Date Established		Oct. 31, 2007
Maturity		Sep. 30, 2037
Total Debt Outstanding		$ 30,928
Interest Rate (as percent)	[1]	8.52%
Coupon Structure at September 30, 2023		3-month SOFR + 2.85% (1)
BNC Capital Trust I
Debt Instrument [Line Items]
Date Established		Apr. 03, 2003
Maturity		Apr. 15, 2033
Total Debt Outstanding		$ 5,155
Interest Rate (as percent)	[1]	8.82%
Coupon Structure at September 30, 2023		3-month SOFR + 3.25% (1)
BNC Capital Trust II
Debt Instrument [Line Items]
Date Established		Mar. 11, 2004
Maturity		Apr. 07, 2034
Total Debt Outstanding		$ 6,186
Interest Rate (as percent)	[1]	8.42%
Coupon Structure at September 30, 2023		3-month SOFR + 2.85% (1)
BNC Capital Trust III
Debt Instrument [Line Items]
Date Established		Sep. 23, 2004
Maturity		Sep. 23, 2034
Total Debt Outstanding		$ 5,155
Interest Rate (as percent)	[1]	7.97%
Coupon Structure at September 30, 2023		3-month SOFR + 2.40% (1)
BNC Capital Trust IV
Debt Instrument [Line Items]
Date Established		Sep. 27, 2006
Maturity		Dec. 31, 2036
Total Debt Outstanding		$ 7,217
Interest Rate (as percent)	[1]	7.36%
Coupon Structure at September 30, 2023		3-month SOFR + 1.70% (1)
Valley Financial Trust I
Debt Instrument [Line Items]
Date Established		Jun. 26, 2003
Maturity		Jun. 26, 2033
Total Debt Outstanding		$ 4,124
Interest Rate (as percent)	[1]	8.76%
Coupon Structure at September 30, 2023		3-month SOFR + 3.10% (1)
Valley Financial Trust II
Debt Instrument [Line Items]
Date Established		Sep. 26, 2005
Maturity		Dec. 15, 2035
Total Debt Outstanding		$ 7,217
Interest Rate (as percent)	[1]	7.16%
Coupon Structure at September 30, 2023		3-month SOFR + 1.49% (1)
Valley Financial Trust III
Debt Instrument [Line Items]
Date Established		Dec. 15, 2006
Maturity		Jan. 30, 2037
Total Debt Outstanding		$ 5,155
Interest Rate (as percent)	[1]	7.36%
Coupon Structure at September 30, 2023		3-month SOFR + 1.73% (1)
Southcoast Capital Trust III
Debt Instrument [Line Items]
Date Established		Aug. 05, 2005
Maturity		Sep. 30, 2035
Total Debt Outstanding		$ 10,310
Interest Rate (as percent)	[1]	7.16%
Coupon Structure at September 30, 2023		3-month SOFR + 1.50% (1)
Pinnacle Financial Subordinated Notes
Debt Instrument [Line Items]
Date Established		Sep. 11, 2019
Maturity		Sep. 15, 2029
Total Debt Outstanding		$ 300,000
Interest Rate (as percent)	[2]	4.13%

[1] Rate transitioned to 3-month term SOFR plus a comparable tenor spread adjustment beginning after July 1, 2023 as three month LIBOR ceased to be published effective July 1, 2023.

[2] Previously was to migrate to three month LIBOR + 2.775%, but will now migrate to an alternative benchmark rate plus comparable spread beginning September 15, 2024 through the end of the term as three month LIBOR ceased to be published effective July 1, 2023.