Regulatory Matters (Details) (USD $)	6 Months Ended
	Jun. 30, 2012
Regulatory Matters [Abstract]
Preceding period of retained earnings used in calculation of dividend payable	2 years
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount of dividend could be paid without prior consent of the OCC	$ 16,300,000
Pinnacle Financial [Member]
Actual Amount [Abstract]
Total capital to risk weighted assets:	532,418,000
Tier I capital to risk weighted assets:	473,897,000
Tier I capital to average assets (*):	473,897,000	[1]
Actual Ratio [Abstract]
Total capital to risk weighted assets:	13.50%
Tier I capital to risk weighted assets:	12.00%
Tier I capital to average assets (*):	10.30%	[1]
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:	315,231,000
Tier I capital to risk weighted assets:	157,616,000
Tier I capital to average assets (*):	183,983,000	[1]
Regulatory Minimum Capital Requirement Ratio [Abstract]
Total capital to risk weighted assets:	8.00%
Tier I capital to risk weighted assets:	4.00%
Tier I capital to average assets (*):	4.00%	[1]
Regulatory Minimum To Be Well Capitalized Amount [Abstract]
Total capital to risk weighted assets:	396,168,000
Tier I capital to risk weighted assets:	237,701,000
Regulatory Minimum To Be Well Capitalized Ratio [Abstract]
Total capital to risk weighted assets:	10.00%
Tier I capital to risk weighted assets:	6.00%
Pinnacle National [Member]
Actual Amount [Abstract]
Total capital to risk weighted assets:	527,408,000
Tier I capital to risk weighted assets:	468,987,000
Tier I capital to average assets (*):	468,987,000	[1]
Actual Ratio [Abstract]
Total capital to risk weighted assets:	13.40%
Tier I capital to risk weighted assets:	11.90%
Tier I capital to average assets (*):	10.20%	[1]
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:	314,579,000
Tier I capital to risk weighted assets:	157,290,000
Tier I capital to average assets (*):	183,507,000	[1]
Regulatory Minimum Capital Requirement Ratio [Abstract]
Total capital to risk weighted assets:	8.00%
Tier I capital to risk weighted assets:	4.00%
Tier I capital to average assets (*):	4.00%	[1]
Regulatory Minimum To Be Well Capitalized Amount [Abstract]
Total capital to risk weighted assets:	395,363,000
Tier I capital to risk weighted assets:	237,218,000
Tier I capital to average assets (*):	$ 229,383,000	[1]
Regulatory Minimum To Be Well Capitalized Ratio [Abstract]
Total capital to risk weighted assets:	10.00%
Tier I capital to risk weighted assets:	6.00%
Tier I capital to average assets (*):	5.00%	[1]

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