Regulatory Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
		Sep. 30, 2015	Dec. 31, 2013
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		$ 0.12	$ 0.08
Pinnacle Financial [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid to Pinnacle Financial by Pinnacle Bank		$ 13,500
Amount available for dividend distribution without prior approval from TDFI		$ 155,900
Compliance with regulatory capital requirements [Abstract]
Common Equity Tier I capital to risk weighted assets:		4.50%
Actual Amount [Abstract]
Total capital to risk weighted assets:		$ 855,900
Tier I capital to risk weighted assets:		730,806
Common Equity Tier I Capital to risk weighted assets:		650,706
Tier I capital to average assets:	[1]	$ 730,806
Actual Ratio [Abstract]
Total capital to risk weighted assets:		11.40%
Tier I capital to risk weighted assets:		9.70%
Common Equity Tier I Capital to Risk Weighted Assets		8.60%
Tier I capital to average assets:	[1]	10.40%
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:		$ 602,600
Tier I capital to risk weighted assets:		451,950
Common Equity Tier I Risk Based Capital to risk weighted assets:		338,962
Tier I capital to average assets:	[1]	$ 280,940
Regulatory Minimum Capital Requirement Ratio [Abstract]
Total capital to risk weighted assets:		8.00%
Tier I capital to risk weighted assets:		6.00%
Tier I capital to average assets:	[1]	4.00%
Regulatory Minimum To Be Well Capitalized Amount [Abstract]
Total capital to risk weighted assets:		$ 753,250
Tier I capital to risk weighted assets:		602,600
Common Equity Tier I capital to risk weighted assets:		489,612
Tier I capital to average assets:		$ 351,176
Regulatory Minimum To Be Well Capitalized Ratio [Abstract]
Total capital to risk weighted assets:		10.00%
Tier I capital to risk weighted assets:		8.00%
Common Equity Tier I capital to risk weighted assets:		6.50%
Pinnacle Bank [Member]
Compliance with regulatory capital requirements [Abstract]
Common Equity Tier I capital to risk weighted assets:		4.50%
Actual Amount [Abstract]
Total capital to risk weighted assets:		$ 808,021
Tier I capital to risk weighted assets:		682,926
Common Equity Tier I Capital to risk weighted assets:		682,826
Tier I capital to average assets:	[1]	$ 682,926
Actual Ratio [Abstract]
Total capital to risk weighted assets:		10.80%
Tier I capital to risk weighted assets:		9.10%
Common Equity Tier I Capital to Risk Weighted Assets		9.10%
Tier I capital to average assets:	[1]	9.80%
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:		$ 601,466
Tier I capital to risk weighted assets:		451,100
Common Equity Tier I Risk Based Capital to risk weighted assets:		338,325
Tier I capital to average assets:	[1]	$ 280,167
Regulatory Minimum Capital Requirement Ratio [Abstract]
Total capital to risk weighted assets:		8.00%
Tier I capital to risk weighted assets:		6.00%
Tier I capital to average assets:	[1]	4.00%
Regulatory Minimum To Be Well Capitalized Amount [Abstract]
Total capital to risk weighted assets:		$ 751,833
Tier I capital to risk weighted assets:		601,466
Common Equity Tier I capital to risk weighted assets:		488,691
Tier I capital to average assets:	[1]	$ 350,209
Regulatory Minimum To Be Well Capitalized Ratio [Abstract]
Total capital to risk weighted assets:		10.00%
Tier I capital to risk weighted assets:		8.00%
Common Equity Tier I capital to risk weighted assets:		6.50%
Tier I capital to average assets:	[1]	5.00%

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