Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Carrying Amount / Notional Amount [Member]
Financial assets [Abstract]
Securities held-to-maturity		$ 25,251,000	$ 31,377,000
Loans, net		8,390,944,000	6,477,803,000
Mortgage loans held-for-sale		47,710,000	47,930,000
Loans held-for-sale		22,588,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase		8,845,014,000	7,050,498,000
Federal Home Loan Bank advances		406,304,000	300,305,000
Subordinated debt and other borrowings		350,768,000	142,476,000
Off-balance sheet instruments [Abstract]
Commitments to extend credit	[1],[2]	3,374,269,000	2,218,784,000
Standby letters of credit	[1]	131,418,000	93,534,000
Securities held-to-maturity		25,233,254	31,585,303
Quoted Market Prices in an Active Market (Level 1) [Member]
Financial assets [Abstract]
Securities held-to-maturity		0	0
Loans, net		0	0
Mortgage loans held-for-sale		0	0
Loans held-for-sale		0
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase		0	0
Federal Home Loan Bank advances		0	0
Subordinated debt and other borrowings		0	0
Off-balance sheet instruments [Abstract]
Commitments to extend credit	[1],[2]	0	0
Standby letters of credit	[1]	0	0
Models with Significant Observable Market Parameters (Level 2) [Member]
Financial assets [Abstract]
Securities held-to-maturity		25,233,000	31,586,000
Loans, net		0	0
Mortgage loans held-for-sale		47,892,000	48,365,000
Loans held-for-sale		22,674,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase		0	0
Federal Home Loan Bank advances		0	0
Subordinated debt and other borrowings		0	0
Off-balance sheet instruments [Abstract]
Commitments to extend credit	[1],[2]	0	0
Standby letters of credit	[1]	0	0
Models with Significant Unobservable Market Parameters (Level 3) [Member]
Financial assets [Abstract]
Securities held-to-maturity		0	0
Loans, net		8,178,982,000	6,379,153,000
Mortgage loans held-for-sale		0	0
Loans held-for-sale		0
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase		8,228,721,000	6,562,509,000
Federal Home Loan Bank advances		406,491,000	299,214,000
Subordinated debt and other borrowings		328,049,000	131,494,000
Off-balance sheet instruments [Abstract]
Commitments to extend credit	[1],[2]	383,000	1,017,000
Standby letters of credit	[1]	740,000	354,000
Estimate of Fair Value Measurement [Member]
Financial assets [Abstract]
Securities held-to-maturity	[3]	25,233,000	31,586,000
Loans, net	[3]	8,178,982,000	6,379,153,000
Mortgage loans held-for-sale	[3]	47,892,000	48,365,000
Loans held-for-sale	[3]	22,674,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	[3]	8,228,721,000	6,562,509,000
Federal Home Loan Bank advances	[3]	406,491,000	299,214,000
Subordinated debt and other borrowings	[3]	328,049,000	131,494,000
Off-balance sheet instruments [Abstract]
Commitments to extend credit	[1],[2],[3]	383,000	1,017,000
Standby letters of credit	[1],[3]	$ 740,000	$ 354,000

[1] At December 31, 2016 and 2015, the fair value of Pinnacle Financial's standby letters of credit was $740,000 and $354,000, respectively. This amount represents the unamortized fee associated with these standby letters of credit, which were priced at market when issued, and is included in the consolidated balance sheet of Pinnacle Financial and is believed to approximate fair value. This fair value will decrease over time as the existing standby letters of credit approach their expiration dates.

[2] At the end of each period, Pinnacle Financial evaluates the inherent risks of the outstanding off-balance sheet commitments. In making this evaluation, Pinnacle Financial evaluates the credit worthiness of the borrower, the collateral supporting the commitments and any other factors similar to those used to evaluate the inherent risks of our loan portfolio. Additionally, Pinnacle Financial evaluates the probability that the outstanding commitment will eventually become a funded loan. As a result, at December 31, 2016 and 2015, respectively, Pinnacle Financial included in other liabilities $383,000 and $1.0 million representing the inherent risks associated with these off-balance sheet commitments.

[3] Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.