Regulatory Matters (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preceding period of retained earnings used in calculation of dividend payable	2 years
Retained earnings	$ 100,834,814		$ 87,386,689
Pinnacle Financial [Member]
Actual Amount [Abstract]
Total capital to risk weighted assets:	568,850,000
Tier I capital to risk weighted assets:	513,781,000
Tier I capital to average assets (*):	513,781,000	[1]
Actual Ratio [Abstract]
Total capital to risk weighted assets: (in hundredths)	13.00%
Tier I capital to risk weighted assets: (in hundredths)	11.70%
Tier I capital to average assets (*): (in hundredths)	10.80%	[1]
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:	351,067,000
Tier I capital to risk weighted assets:	175,534,000
Tier I capital to average assets (*):	175,534,000	[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:	440,555,000
Tier I capital to risk weighted assets:	264,333,000
Tier I capital to average assets (*):	264,333,000	[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%
Pinnacle Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	72,500,000
Actual Amount [Abstract]
Total capital to risk weighted assets:	560,476,000
Tier I capital to risk weighted assets:	505,511,000
Tier I capital to average assets (*):	505,511,000	[1]
Actual Ratio [Abstract]
Total capital to risk weighted assets: (in hundredths)	12.80%
Tier I capital to risk weighted assets: (in hundredths)	11.60%
Tier I capital to average assets (*): (in hundredths)	10.70%	[1]
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:	350,388,000
Tier I capital to risk weighted assets:	175,194,000
Tier I capital to average assets (*):	175,194,000	[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:	439,717,000
Tier I capital to risk weighted assets:	263,830,000
Tier I capital to average assets (*):	$ 263,830,000	[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.