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Other borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Subordinated debt and other borrowings $ 425,821 $ 424,938
Debt issuance costs and fair value adjustments $ (7,174)  
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) 7.41%  
Coupon Structure [1] 3-month SOFR + 2.80%(1)  
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) 5.99%  
Coupon Structure [1] 3-month SOFR + 1.40%(1)  
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) 6.24%  
Coupon Structure [1] 3-month SOFR + 1.65%(1)  
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) 7.47%  
Coupon Structure [1] 3-month SOFR + 2.85%(1)  
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) 8.17%  
Coupon Structure [1] 3-month SOFR + 3.25%(1)  
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) 7.77%  
Coupon Structure [1] 3-month SOFR + 2.85%(1)  
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) 7.32%  
Coupon Structure [1] 3-month SOFR + 2.40%(1)  
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) 6.29%  
Coupon Structure [1] 3-month SOFR + 1.70%(1)  
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) 7.69%  
Coupon Structure [1] 3-month SOFR + 3.10%(1)  
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) 6.11%  
Coupon Structure [1] 3-month SOFR + 1.49%(1)  
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) 6.58%  
Coupon Structure [1] 3-month SOFR + 1.73%(1)  
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) 6.09%  
Coupon Structure [1] 3-month SOFR + 1.50%(1)  
Pinnacle Financial Subordinated Notes    
Debt Instrument [Line Items]    
Date Established Sep. 11, 2019  
Maturity Sep. 15, 2029  
Subordinated debt and other borrowings $ 300,000  
Interest Rate (as percent) 7.40%  
Pinnacle Financial Notes 2019    
Debt Instrument [Line Items]    
Coupon Structure [2] 3-month SOFR + 3.04%(2)  
[1] Rate transitioned to three month 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 migrated to three month SOFR + 3.04% beginning September 15, 2024 through the end of the term as three month LIBOR ceased to be published effective July 1, 2023.