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Other borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Subordinated debt and other borrowings	$ 465,504,589	$ 350,768,050
Debt issuance costs and fair value adjustments	$ (7,990,000)
Revolving credit facility
Debt Instrument [Line Items]
Date Established	Mar. 29, 2016
Maturity	Mar. 27, 2018
Subordinated debt and other borrowings	$ 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)	4.40%
Coupon Structure	30-day LIBOR + 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)	3.09%
Coupon Structure	30-day LIBOR + 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)	3.34%
Coupon Structure	30-day LIBOR + 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)	4.44%
Coupon Structure	30-day LIBOR + 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)	4.61%
Coupon Structure	30-day LIBOR + 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)	4.21%
Coupon Structure	30-day LIBOR + 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)	3.76%
Coupon Structure	30-day LIBOR + 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)	3.39%
Coupon Structure	30-day LIBOR + 1.70%
Valley Financial Trust I
Debt Instrument [Line Items]
Date Established	Aug. 05, 2005
Maturity	Sep. 30, 2035
Subordinated debt and other borrowings	$ 4,124,000
Interest Rate (as percent)	4.77%
Coupon Structure	30-day LIBOR + 3.10%
Valley Financial Trust II
Debt Instrument [Line Items]
Date Established	Jun. 06, 2003
Maturity	Jun. 26, 2033
Subordinated debt and other borrowings	$ 7,217,000
Interest Rate (as percent)	3.08%
Coupon Structure	30-day LIBOR + 1.49%
Valley Financial Trust III
Debt Instrument [Line Items]
Date Established	Sep. 26, 2005
Maturity	Dec. 15, 2035
Subordinated debt and other borrowings	$ 5,155,000
Interest Rate (as percent)	3.11%
Coupon Structure	30-day LIBOR + 1.73%
Southcoast Capital Trust III
Debt Instrument [Line Items]
Date Established	Dec. 15, 2006
Maturity	Jan. 30, 2037
Subordinated debt and other borrowings	$ 10,310,000
Interest Rate (as percent)	3.19%
Coupon Structure	30-day LIBOR + 1.50%
Pinnacle Bank Subordinated Notes
Debt Instrument [Line Items]
Date Established	Jul. 30, 2015
Maturity	Jul. 30, 2025
Subordinated debt and other borrowings	$ 60,000,000
Interest Rate (as percent)	4.88%
Coupon Structure	Fixed(1)
Pinnacle Bank Subordinated Notes
Debt Instrument [Line Items]
Date Established	Mar. 10, 2016
Maturity	Jul. 30, 2025
Subordinated debt and other borrowings	$ 70,000,000
Interest Rate (as percent)	4.88%
Coupon Structure	Fixed(1)
Avenue Subordinated Notes
Debt Instrument [Line Items]
Date Established	Dec. 29, 2014
Maturity	Dec. 29, 2024
Subordinated debt and other borrowings	$ 20,000,000
Interest Rate (as percent)	6.75%
Coupon Structure	Fixed(2)
Pinnacle Financial Subordinated Notes
Debt Instrument [Line Items]
Date Established	Nov. 16, 2016
Maturity	Nov. 16, 2026
Subordinated debt and other borrowings	$ 120,000,000
Interest Rate (as percent)	5.25%
Coupon Structure	Fixed(3)
BNC Subordinated Notes
Debt Instrument [Line Items]
Date Established	Sep. 25, 2014
Maturity	Oct. 01, 2024
Subordinated debt and other borrowings	$ 60,000,000
Interest Rate (as percent)	5.50%
Coupon Structure	Fixed(4)
BNC Subordinated Note
Debt Instrument [Line Items]
Date Established	Oct. 15, 2013
Maturity	Oct. 15, 2023
Subordinated debt and other borrowings	$ 10,500,000
Interest Rate (as percent)	6.35%
Coupon Structure	30-day LIBOR + 5.0%(5)

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