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Other borrowings (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Subordinated debt and other borrowings $ 485,130,000 $ 465,505,000
Debt issuance costs and fair value adjustments $ (7,745,000)  
Revolving credit facility    
Debt Instrument [Line Items]    
Date Established [1] Apr. 26, 2018  
Maturity [1] Apr. 25, 2019  
Subordinated debt and other borrowings [1] $ 20,000,000  
Interest Rate (as percent) [1] 4.10%  
Line of Credit Facility, Maximum Borrowing Capacity $ 75,000,000.0  
Pinnacle Statutory Trust I    
Debt Instrument [Line Items]    
Date Established Dec. 29, 2003  
Maturity Dec. 30, 2033  
Subordinated debt and other borrowings $ 10,310,000  
Interest Rate (as percent) 5.59%  
Coupon Structure 30-day 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 $ 20,619,000  
Interest Rate (as percent) 4.20%  
Coupon Structure 30-day 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 $ 20,619,000  
Interest Rate (as percent) 4.45%  
Coupon Structure 30-day 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 $ 30,928,000  
Interest Rate (as percent) 5.64%  
Coupon Structure 30-day 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 $ 5,155,000  
Interest Rate (as percent) 5.69%  
Coupon Structure 30-day 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 $ 6,186,000  
Interest Rate (as percent) 5.29%  
Coupon Structure 30-day 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 $ 5,155,000  
Interest Rate (as percent) 4.84%  
Coupon Structure 30-day 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 $ 7,217,000  
Interest Rate (as percent) 4.50%  
Coupon Structure 30-day 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 $ 4,124,000  
Interest Rate (as percent) 5.92%  
Coupon Structure 30-day 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 $ 7,217,000  
Interest Rate (as percent) 4.28%  
Coupon Structure 30-day 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 $ 5,155,000  
Interest Rate (as percent) 4.25%  
Coupon Structure 30-day 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 $ 10,310,000  
Interest Rate (as percent) 4.30%  
Coupon Structure 30-day LIBOR + 1.50%  
Debt Instrument, Basis Spread on Variable Rate 1.50%  
Pinnacle Bank Subordinated Notes    
Debt Instrument [Line Items]    
Date Established Jul. 30, 2015  
Maturity Jul. 30, 2025  
Subordinated debt and other borrowings [2] $ 60,000,000  
Interest Rate (as percent) [2] 4.875%  
Coupon Structure LIBOR + 3.128%  
Debt Instrument, Basis Spread on Variable Rate 3.128%  
Pinnacle Bank Subordinated Notes    
Debt Instrument [Line Items]    
Date Established Mar. 10, 2016  
Maturity Jul. 30, 2025  
Subordinated debt and other borrowings [2] $ 70,000,000  
Interest Rate (as percent) [2] 4.875%  
Coupon Structure LIBOR + 3.128%  
Debt Instrument, Basis Spread on Variable Rate 3.128%  
Avenue Subordinated Notes    
Debt Instrument [Line Items]    
Date Established Dec. 29, 2014  
Maturity Dec. 29, 2024  
Subordinated debt and other borrowings [3] $ 20,000,000  
Interest Rate (as percent) [3] 6.75%  
Coupon Structure LIBOR + 4.95%  
Debt Instrument, Term of variable rate 3 months  
Debt Instrument, Basis Spread on Variable Rate 4.95%  
Pinnacle Financial Subordinated Notes    
Debt Instrument [Line Items]    
Date Established Nov. 16, 2016  
Maturity Nov. 16, 2026  
Subordinated debt and other borrowings [4] $ 120,000,000  
Interest Rate (as percent) [4] 5.25%  
Coupon Structure LIBOR + 3.884%  
Debt Instrument, Term of variable rate 3 months  
Debt Instrument, Basis Spread on Variable Rate 3.884%  
BNC Subordinated Notes    
Debt Instrument [Line Items]    
Date Established Sep. 25, 2014  
Maturity Oct. 01, 2024  
Subordinated debt and other borrowings [5] $ 60,000,000  
Interest Rate (as percent) [5] 5.50%  
Coupon Structure LIBOR + 3.59%  
Debt Instrument, Term of variable rate 3 months  
Debt Instrument, Basis Spread on Variable Rate 3.59%  
BNC Subordinated Note    
Debt Instrument [Line Items]    
Date Established Oct. 15, 2013  
Maturity Oct. 15, 2023  
Subordinated debt and other borrowings [6] $ 9,880,000  
Interest Rate (as percent) [6] 7.34%  
Coupon Structure 30-day LIBOR + 5.50%  
Debt Instrument, Basis Spread on Variable Rate 5.50%  
BNC Bancorp | Minimum | BNC Subordinated Notes Assumed Due October 2023 [Member]    
Debt Instrument [Line Items]    
Interest Rate (as percent) 5.00%  
BNC Bancorp | Maximum | BNC Subordinated Notes Assumed Due October 2023 [Member]    
Debt Instrument [Line Items]    
Interest Rate (as percent) 9.50%  
[1] Borrowing capacity on the revolving credit facility is $75.0 million. An unused fee of 0.35% is assessed on the average daily unused amount of the loan.
[2] Migrates to three month LIBOR + 3.128% beginning July 30, 2020 through the end of the term.
[3] Migrates to three month LIBOR + 4.95% beginning January 1, 2020 through the end of the term.
[4] Migrates to three month LIBOR + 3.884% beginning November 16, 2021 through the end of the term.
[5] Migrates to three month LIBOR + 3.59% beginning October 1, 2019 through the end of the term if not redeemed on that date.
[6] Coupon structure includes a floor of 5.0% and a cap of 9.5%.