Fair Value of Financial Instruments, 2 (Details) - USD ($)		Sep. 30, 2015	Dec. 31, 2014
Carrying Amount / Notional Amount [Member]
Financial assets [Abstract]
Securities held-to-maturity		$ 31,698,000	$ 38,676,000
Loans, net		6,272,230,000	4,522,668,000
Mortgage loans held-for-sale		47,672,000	14,039,000
Loans Held-for-sale, Fair Value Disclosure		20,236,000
Mortgage servicing rights fair value disclosure		9,128,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase		6,668,756,000	4,876,600,000
Federal Home Loan Bank advances		545,330,000	195,476,000
Subordinated debt and other borrowings		142,476,000	96,158,000
Off-balance sheet instruments [Abstract]
Commitments to extend credit	[1]	2,219,059,000	1,390,593,000
Standby letters of credit	[2]	81,732,000	65,955,000
Securities held-to-maturity		31,850,119	38,788,870
Valuation allowance of impaired loans		2,100,000	1,200,000
Commitments to Extend Credit [Member]
Off-balance sheet instruments [Abstract]
Off-balance sheet commitments		1,300,000	1,400,000
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, Fair Value Disclosure		0
Mortgage servicing rights fair value disclosure		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]	0	0
Standby letters of credit	[2]	0	0
Models with Significant Observable Market Parameters (Level 2) [Member]
Financial assets [Abstract]
Securities held-to-maturity		31,850,000	38,789,000
Loans, net		0	0
Mortgage loans held-for-sale		48,097,000	14,322,000
Loans Held-for-sale, Fair Value Disclosure		20,415,000
Mortgage servicing rights fair value disclosure		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]	0	0
Standby letters of credit	[2]	0	0
Models with Significant Unobservable Market Parameters (Level 3) [Member]
Financial assets [Abstract]
Securities held-to-maturity		0	0
Loans, net		6,182,104,000	4,406,581,000
Mortgage loans held-for-sale		0	0
Loans Held-for-sale, Fair Value Disclosure		0
Mortgage servicing rights fair value disclosure		9,400,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase		6,147,757,000	4,603,915,000
Federal Home Loan Bank advances		548,531,000	195,450,000
Subordinated debt and other borrowings		128,818,000	77,433,000
Off-balance sheet instruments [Abstract]
Commitments to extend credit	[1]	1,071,000	1,078,000
Standby letters of credit	[2]	265,000	293,000
Estimate of Fair Value Measurement [Member]
Financial assets [Abstract]
Securities held-to-maturity	[3]	31,850,000	38,789,000
Loans, net	[3]	6,182,104,000	4,406,581,000
Mortgage loans held-for-sale	[3]	48,097,000	14,322,000
Loans Held-for-sale, Fair Value Disclosure	[3]	20,415,000
Mortgage servicing rights fair value disclosure	[3]	9,400,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	[3]	6,147,757,000	4,603,915,000
Federal Home Loan Bank advances	[3]	548,531,000	195,450,000
Subordinated debt and other borrowings	[3]	128,818,000	77,433,000
Off-balance sheet instruments [Abstract]
Commitments to extend credit	[1],[3]	1,071,000	1,078,000
Standby letters of credit	[2],[3]	$ 265,000	$ 293,000

[1] At the end of each quarter, 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 both September 30, 2015 and December 31, 2014, Pinnacle Financial included in other liabilities $1.1 million, representing the inherent risks associated with these off-balance sheet commitments.

[2] At September 30, 2015 and December 31, 2014, the fair value of Pinnacle Financial's standby letters of credit was $265,000 and $293,000, respectively. This amount represents the unamortized fee associated with these standby letters of credit 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.

[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.