Subordinated Debt and Other borrowings (Details)		3 Months Ended
		Mar. 31, 2017 USD ($) Subsidiary	Dec. 31, 2016 USD ($)
Subordinated Debt and Other borrowings [Abstract]
Number of wholly owned subsidiaries | Subsidiary		4
Term of capital trust preferred securities		30 years
Debt Instrument [Line Items]
Total debt outstanding		$ 350,848,829	$ 350,768,050
Debt issuance costs and fair value adjustments		$ (1,627,171)
Bank of North Carolina (BNC) [Member]
Debt Instrument [Line Items]
Date established		Sep. 01, 2014
Maturity date		Oct. 31, 2024
Total debt outstanding		$ 60,000,000
Interest rate at end of period		5.50%
Floating interest rate		Libor + 3.59
Debt instrument, basis spread on variable rate		3.59%
Debt instrument, term of variable rate		3 months
Face amount		$ 50,500,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Date established	[1]	Mar. 29, 2016
Total debt outstanding	[1]	$ 0
Interest rate at end of period	[1]	0.00%
Maximum borrowing capacity		$ 75,000,000
Trust I [Member]
Debt Instrument [Line Items]
Date established		Dec. 29, 2003
Maturity date		Dec. 30, 2033
Total debt outstanding		$ 10,310,000
Interest rate at end of period		3.95%
Floating interest rate		LIBOR + 2.80%
Debt instrument, basis spread on variable rate		2.80%
Trust II [Member]
Debt Instrument [Line Items]
Date established		Sep. 15, 2005
Maturity date		Sep. 30, 2035
Total debt outstanding		$ 20,619,000
Interest rate at end of period		2.55%
Floating interest rate		LIBOR + 1.40%
Debt instrument, basis spread on variable rate		1.40%
Trust III [Member]
Debt Instrument [Line Items]
Date established		Sep. 07, 2006
Maturity date		Sep. 30, 2036
Total debt outstanding		$ 20,619,000
Interest rate at end of period		2.80%
Floating interest rate		LIBOR + 1.65%
Debt instrument, basis spread on variable rate		1.65%
Trust IV [Member]
Debt Instrument [Line Items]
Date established		Oct. 31, 2007
Maturity date		Sep. 30, 2037
Total debt outstanding		$ 30,928,000
Interest rate at end of period		3.98%
Floating interest rate		LIBOR + 2.85%
Debt instrument, basis spread on variable rate		2.85%
Pinnacle Bank Notes [Member]
Debt Instrument [Line Items]
Date established	[2]	Jul. 30, 2015
Maturity date	[2]	Jul. 30, 2025
Total debt outstanding	[2]	$ 60,000,000
Interest rate at end of period	[2]	4.875%
Floating interest rate		LIBOR + 3.128%
Debt instrument, basis spread on variable rate		3.128%
Debt instrument, term of variable rate		3 months
Pinnacle Bank Notes [Member]
Debt Instrument [Line Items]
Date established	[2]	Mar. 10, 2016
Maturity date	[2]	Jul. 30, 2025
Total debt outstanding	[2]	$ 70,000,000
Interest rate at end of period	[2]	4.875%
Floating interest rate		LIBOR + 3.128%
Debt instrument, basis spread on variable rate		3.128%
Debt instrument, term of variable rate		3 months
Avenue Subordinated Notes [Member]
Debt Instrument [Line Items]
Date established	[3]	Dec. 29, 2014
Maturity date	[3]	Dec. 29, 2024
Total debt outstanding	[3]	$ 20,000,000
Interest rate at end of period	[3]	6.75%
Floating interest rate		LIBOR + 4.95%
Debt instrument, basis spread on variable rate		4.95%
Debt instrument, term of variable rate		3 months
Pinnacle Financial Notes [Member]
Debt Instrument [Line Items]
Date established	[4]	Nov. 16, 2016
Maturity date	[4]	Nov. 16, 2026
Total debt outstanding	[4]	$ 120,000,000
Interest rate at end of period	[4]	5.25%
Floating interest rate		LIBOR + 3.884%
Debt instrument, basis spread on variable rate		3.884%
Debt instrument, term of variable rate		3 months

[1] Borrowing capacity on the revolving credit facility is $75.0 million. At March 31, 2017, there was no outstanding balance under this facility. This credit facility was recently amended to extend the maturity date to March 27, 2018.

[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.