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Other borrowings (Details) $ in Thousands				3 Months Ended
		Nov. 16, 2021 USD ($)	Jul. 30, 2021 USD ($)	Mar. 31, 2022 USD ($) subsidiary	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Number of wholly owned subsidiaries | subsidiary				12
Term				30 years
Total Debt Outstanding				$ 423,319	$ 423,172
Debt issuance costs and fair value adjustments				(9,676)
Loans				24,499,022	23,414,262
Repayments of Subordinated Debt		$ 120,000	$ 130,000
Paycheck Protection Program [Member]
Debt Instrument [Line Items]
Loans				157,200	$ 371,100
Paycheck Protection Program Liquidity Facility
Debt Instrument [Line Items]
Line of Credit, Current				$ 0
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)				3.72%
Coupon Structure				30-day LIBOR + 2.80%
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)				2.40%
Coupon Structure				30-day LIBOR + 1.40%
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)				2.66%
Coupon Structure				30-day LIBOR + 1.65%
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)				3.68%
Coupon Structure				30-day LIBOR + 2.85%
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)				3.49%
Coupon Structure				30-day LIBOR + 3.25%
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)				3.09%
Coupon Structure				30-day LIBOR + 2.85%
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)				2.64%
Coupon Structure				30-day LIBOR + 2.40%
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)				2.70%
Coupon Structure				30-day LIBOR + 1.70%
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)				4.07%
Coupon Structure				30-day LIBOR + 3.10%
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)				2.32%
Coupon Structure				30-day LIBOR + 1.49%
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)				2.03%
Coupon Structure				30-day LIBOR + 1.73%
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)				2.50%
Coupon Structure				30-day LIBOR + 1.50%
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)	[1]			4.13%
[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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