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Other borrowings (Details) - USD ($) $ in Thousands				12 Months Ended
		Nov. 16, 2021	Jul. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Subordinated debt and other borrowings				$ 424,055	$ 423,172
Debt issuance costs and fair value adjustments				$ (8,940)
Repayments of Subordinated Debt		$ 120,000	$ 130,000
Pinnacle Statutory Trust I
Debt Instrument [Line Items]
Date Established				Dec. 29, 2003
Maturity				Dec. 30, 2033
Subordinated debt and other borrowings				$ 10,310
Interest Rate (as percent)				7.54%
Coupon Structure				3-month LIBOR + 2.80%
Debt Instrument, Basis Spread on Variable Rate				2.80%
Pinnacle Statutory Trust II
Debt Instrument [Line Items]
Date Established				Sep. 15, 2005
Maturity				Sep. 30, 2035
Subordinated debt and other borrowings				$ 20,619
Interest Rate (as percent)				6.13%
Coupon Structure				3-month LIBOR + 1.40%
Debt Instrument, Basis Spread on Variable Rate				1.40%
Pinnacle Statutory Trust III
Debt Instrument [Line Items]
Date Established				Sep. 07, 2006
Maturity				Sep. 30, 2036
Subordinated debt and other borrowings				$ 20,619
Interest Rate (as percent)				6.40%
Coupon Structure				3-month LIBOR + 1.65%
Debt Instrument, Basis Spread on Variable Rate				1.65%
Pinnacle Statutory Trust IV
Debt Instrument [Line Items]
Date Established				Oct. 31, 2007
Maturity				Sep. 30, 2037
Subordinated debt and other borrowings				$ 30,928
Interest Rate (as percent)				7.62%
Coupon Structure				3-month LIBOR + 2.85%
Debt Instrument, Basis Spread on Variable Rate				2.85%
BNC Capital Trust I
Debt Instrument [Line Items]
Date Established				Apr. 03, 2003
Maturity				Apr. 15, 2033
Subordinated debt and other borrowings				$ 5,155
Interest Rate (as percent)				7.33%
Coupon Structure				3-month LIBOR + 3.25%
Debt Instrument, Basis Spread on Variable Rate				3.25%
BNC Capital Trust II
Debt Instrument [Line Items]
Date Established				Mar. 11, 2004
Maturity				Apr. 07, 2034
Subordinated debt and other borrowings				$ 6,186
Interest Rate (as percent)				6.93%
Coupon Structure				3-month LIBOR + 2.85%
Debt Instrument, Basis Spread on Variable Rate				2.85%
BNC Capital Trust III
Debt Instrument [Line Items]
Date Established				Sep. 23, 2004
Maturity				Sep. 23, 2034
Subordinated debt and other borrowings				$ 5,155
Interest Rate (as percent)				6.48%
Coupon Structure				3-month LIBOR + 2.40%
Debt Instrument, Basis Spread on Variable Rate				2.40%
BNC Capital Trust IV
Debt Instrument [Line Items]
Date Established				Sep. 27, 2006
Maturity				Dec. 31, 2036
Subordinated debt and other borrowings				$ 7,217
Interest Rate (as percent)				6.43%
Coupon Structure				3-month LIBOR + 1.70%
Debt Instrument, Basis Spread on Variable Rate				1.70%
Valley Financial Trust I
Debt Instrument [Line Items]
Date Established				Jun. 26, 2003
Maturity				Jun. 26, 2033
Subordinated debt and other borrowings				$ 4,124
Interest Rate (as percent)				7.82%
Coupon Structure				3-month LIBOR + 3.10%
Debt Instrument, Basis Spread on Variable Rate				3.10%
Valley Financial Trust II
Debt Instrument [Line Items]
Date Established				Sep. 26, 2005
Maturity				Dec. 15, 2035
Subordinated debt and other borrowings				$ 7,217
Interest Rate (as percent)				6.26%
Coupon Structure				3-month LIBOR + 1.49%
Debt Instrument, Basis Spread on Variable Rate				1.49%
Valley Financial Trust III
Debt Instrument [Line Items]
Date Established				Dec. 15, 2006
Maturity				Jan. 30, 2037
Subordinated debt and other borrowings				$ 5,155
Interest Rate (as percent)				6.14%
Coupon Structure				3-month LIBOR + 1.73%
Debt Instrument, Basis Spread on Variable Rate				1.73%
Southcoast Capital Trust III
Debt Instrument [Line Items]
Date Established				Aug. 05, 2005
Maturity				Sep. 30, 2035
Subordinated debt and other borrowings				$ 10,310
Interest Rate (as percent)				6.23%
Coupon Structure				3-month LIBOR + 1.50%
Debt Instrument, Basis Spread on Variable Rate				1.50%
Pinnacle Financial Subordinated Notes
Debt Instrument [Line Items]
Date Established				Sep. 11, 2019
Maturity				Sep. 15, 2029
Subordinated debt and other borrowings	[1]			$ 300,000
Interest Rate (as percent)	[1]			4.13%
Coupon Structure	[1]			LIBOR + 2.775%
Debt Instrument, Basis Spread on Variable Rate	[1]			2.775%
Debt Instrument, Term of variable rate	[1]			3 months
[1] Migrates to three month LIBOR + 2.775% (or an alternative benchmark rate plus comparable spread in the event that three month LIBOR is no longer published on such adjustment date) beginning September 15, 2024 through the end of the term.

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