Regulatory Matters (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preceding period of retained earnings used in calculation of dividend payable	2 years
Dividends Payable, Amount Per Share	$ 0.08
Pinnacle Financial [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid to Pinnacle Financial by Pinnacle Bank	$ 15,100,000
Amount available for dividend distribution without prior approval from TDFI	103,900,000
Actual Amount [Abstract]
Total capital to risk weighted assets:	677,061,000
Tier I capital to risk weighted assets:	613,887,000
Tier I capital to average assets:	613,887,000	[1]
Actual Ratio [Abstract]
Total capital to risk weighted assets: (in hundredths)	13.40%
Tier I capital to risk weighted assets: (in hundredths)	12.20%
Tier I capital to average assets: (in hundredths)	11.20%	[1]
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:	403,967,000
Tier I capital to risk weighted assets:	201,984,000
Tier I capital to average assets:	220,294,000	[1]
Regulatory Minimum Capital Requirement Ratio [Abstract]
Total capital to risk weighted assets: (in hundredths)	8.00%
Tier I capital to risk weighted assets: (in hundredths)	4.00%
Tier I capital to average assets: (in hundredths)	4.00%	[1]
Regulatory Minimum To Be Well Capitalized Amount [Abstract]
Total capital to risk weighted assets:	505,395,000
Tier I capital to risk weighted assets:	303,237,000
Regulatory Minimum To Be Well Capitalized Ratio [Abstract]
Total capital to risk weighted assets: (in hundredths)	10.00%
Tier I capital to risk weighted assets: (in hundredths)	6.00%
Pinnacle Bank [Member]
Actual Amount [Abstract]
Total capital to risk weighted assets:	641,862,000
Tier I capital to risk weighted assets:	578,867,000
Tier I capital to average assets:	578,867,000	[1]
Actual Ratio [Abstract]
Total capital to risk weighted assets: (in hundredths)	12.80%
Tier I capital to risk weighted assets: (in hundredths)	11.50%
Tier I capital to average assets: (in hundredths)	10.60%	[1]
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:	402,803,000
Tier I capital to risk weighted assets:	201,401,000
Tier I capital to average assets:	219,507,000	[1]
Regulatory Minimum Capital Requirement Ratio [Abstract]
Total capital to risk weighted assets: (in hundredths)	8.00%
Tier I capital to risk weighted assets: (in hundredths)	4.00%
Tier I capital to average assets: (in hundredths)	4.00%	[1]
Regulatory Minimum To Be Well Capitalized Amount [Abstract]
Total capital to risk weighted assets:	503,957,000
Tier I capital to risk weighted assets:	302,374,000
Tier I capital to average assets:	$ 274,383,000	[1]
Regulatory Minimum To Be Well Capitalized Ratio [Abstract]
Total capital to risk weighted assets: (in hundredths)	10.00%
Tier I capital to risk weighted assets: (in hundredths)	6.00%
Tier I capital to average assets: (in hundredths)	5.00%	[1]

[1] Average assets for the above calculations were based on the most recent quarter.