Fair Value of Financial Instruments, 2 (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Financial assets [Abstract]
Securities held-to-maturity	$ 38,788,870	[1]	$ 38,817,467
Carrying Amount / Notional Amount [Member]
Financial assets [Abstract]
Securities held-to-maturity	38,676,000		39,796,000
Loans, net	4,522,668,000		4,076,524,000
Mortgage loans held-for-sale	14,039,000		12,850,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	4,876,600,000		4,603,938,000
Federal Home Loan Bank advances	195,476,000		90,637,000
Subordinated debt and other borrowings	96,158,000		98,658,000
Off-balance sheet instruments [Abstract]
Commitments to extend credit	1,390,593,000	[2]	1,206,528,000	[2]
Standby letters of credit	65,955,000	[3]	69,231,000	[3]
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
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	0	[2]	0	[2]
Standby letters of credit	0	[3]	0	[3]
Models with Significant Observable Market Parameters (Level 2) [Member]
Financial assets [Abstract]
Securities held-to-maturity	38,789,000		38,817,000
Loans, net	0		0
Mortgage loans held-for-sale	14,322,000		12,999,000
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	0	[2]	0	[2]
Standby letters of credit	0	[3]	0	[3]
Models with Significant Unobservable Market Parameters (Level 3) [Member]
Financial assets [Abstract]
Securities held-to-maturity	0		0
Loans, net	4,406,581,000		4,021,675,000
Mortgage loans held-for-sale	0		0
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	4,603,915,000		4,378,805,000
Federal Home Loan Bank advances	195,450,000		90,652,000
Subordinated debt and other borrowings	77,433,000		73,083,000
Off-balance sheet instruments [Abstract]
Commitments to extend credit	1,078,000	[2]	1,040,000	[2]
Standby letters of credit	293,000	[3]	331,000	[3]
Estimate of Fair Value Measurement [Member]
Financial assets [Abstract]
Securities held-to-maturity	38,789,000	[1]	38,817,000	[1]
Loans, net	4,406,581,000	[1]	4,021,675,000	[1]
Mortgage loans held-for-sale	14,322,000	[1]	12,999,000	[1]
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	4,603,915,000	[1]	4,378,805,000	[1]
Federal Home Loan Bank advances	195,450,000	[1]	90,652,000	[1]
Subordinated debt and other borrowings	77,433,000	[1]	73,083,000	[1]
Off-balance sheet instruments [Abstract]
Commitments to extend credit	1,078,000	[1],[2]	1,040,000	[1],[2]
Standby letters of credit	$ 293,000	[1],[3]	$ 331,000	[1],[3]

[1] 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.

[2] 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 December 31, 2014 and 2013, Pinnacle Financial included in other liabilities $1.1 million and $1.0 million, respectively, representing the inherent risks associated with these off-balance sheet commitments.

[3] At December 31, 2014 and 2013, the fair value of Pinnacle Financial's standby letters of credit was $293,000 and $331,000, 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.