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Other borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Subordinated debt and other borrowings $ 424,938 $ 424,055
Debt issuance costs and fair value adjustments $ (8,057)  
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) 8.44%  
Coupon Structure 3-month SOFR + 2.80%(1)  
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) 6.99%  
Coupon Structure 3-month SOFR + 1.40%(1)  
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) 7.24%  
Coupon Structure 3-month SOFR + 1.65%(1)  
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) 8.50%  
Coupon Structure 3-month SOFR + 2.85%(1)  
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) 8.91%  
Coupon Structure 3-month SOFR + 3.25%(1)  
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) 8.51%  
Coupon Structure 3-month SOFR + 2.85%(1)  
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) 8.06%  
Coupon Structure 3-month SOFR + 2.40%(1)  
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) 7.29%  
Coupon Structure 3-month SOFR + 1.70%(1)  
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) 8.72%  
Coupon Structure 3-month SOFR + 3.10%(1)  
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) 7.14%  
Coupon Structure 3-month SOFR + 1.49%(1)  
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) 7.38%  
Coupon Structure 3-month SOFR + 1.73%(1)  
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) 7.09%  
Coupon Structure 3-month SOFR + 1.50%(1)  
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] 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.