Regulatory Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Dec. 31, 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		$ 0.14	$ 0.08
Pinnacle Financial [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid to Pinnacle Financial by Pinnacle Bank		$ 6,400
Amount available for dividend distribution without prior approval from TDFI		$ 146,900
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:		$ 918,456
Tier I capital to risk weighted assets:		726,580
Common Equity Tier I Capital to risk weighted assets:		646,458
Tier I capital to average assets:	[1]	$ 726,580
Actual Ratio [Abstract]
Total capital to risk weighted assets:		11.10%
Tier I capital to risk weighted assets:		8.70%
Common Equity Tier I Capital to Risk Weighted Assets		7.80%
Tier I capital to average assets:	[1]	8.80%
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:		$ 664,333
Tier I capital to risk weighted assets:		498,250
Common Equity Tier I Risk Based Capital to risk weighted assets:		373,687
Tier I capital to average assets:	[1]	$ 330,435
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:		$ 830,416
Tier I capital to risk weighted assets:		664,333
Common Equity Tier I capital to risk weighted assets:		539,771
Tier I capital to average assets:		413,043
Common Equity Tier I capital to risk weighted assets:		$ 539,771
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:		$ 882,941
Tier I capital to risk weighted assets:		691,065
Common Equity Tier I Capital to risk weighted assets:		690,942
Tier I capital to average assets:	[1]	$ 691,065
Actual Ratio [Abstract]
Total capital to risk weighted assets:		10.70%
Tier I capital to risk weighted assets:		8.30%
Common Equity Tier I Capital to Risk Weighted Assets		8.30%
Tier I capital to average assets:	[1]	8.40%
Regulatory Minimum Capital Requirement Amount [Abstract]
Total capital to risk weighted assets:		$ 663,466
Tier I capital to risk weighted assets:		497,600
Common Equity Tier I Risk Based Capital to risk weighted assets:		373,200
Tier I capital to average assets:	[1]	$ 330,244
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:		$ 829,333
Tier I capital to risk weighted assets:		663,466
Common Equity Tier I capital to risk weighted assets:		539,066
Tier I capital to average assets:	[1]	412,805
Common Equity Tier I capital to risk weighted assets:		$ 539,066
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.