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Regulatory Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
		Jun. 30, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preceding period of retained earnings used in calculation of dividend payable		2 years
Quarterly common stock dividend (in dollar per share)		$ 0.14
Pinnacle Financial
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid to Pinnacle Financial by Pinnacle Bank		$ 50,500
Actual
Total capital to risk weighted assets		2,413,368	$ 2,266,161
Tier I capital to risk weighted assets		1,864,397	1,725,323
Common Equity Tier I capital to risk weighted assets		1,864,274	1,725,219
Tier I capital to average assets	[1]	$ 1,864,397	$ 1,725,323
Actual
Total capital to risk weighted assets (as percent)		12.00%	12.00%
Tier I capital to risk weighted assets (as percent)		9.30%	9.10%
Common Equity Tier I capital to risk weighted assets (as percent)		9.30%	9.10%
Tier I capital to average assets (as percent)	[1]	8.80%	8.60%
Minimum Capital Requirement
Total capital to risk weighted assets		$ 1,612,148	$ 1,509,496
Tier I capital to risk weighted assets		1,209,111	1,132,122
Common Equity Tier I capital		906,833	849,092
Tier I capital to average assets	[1]	$ 850,857	$ 797,861
Minimum Capital Requirement
Total capital to risk weighted assets (as percent)		8.00%	8.00%
Tier I capital to risk weighted assets (as percent)		6.00%	6.00%
Common Equity Tier I capital to risk weighted assets (as percent)		4.50%	4.50%
Tier I capital to average assets (as percent)	[1]	4.00%	4.00%
Pinnacle Bank
Actual
Total capital to risk weighted assets		$ 2,254,929	$ 2,134,344
Tier I capital to risk weighted assets		2,048,545	1,936,313
Common Equity Tier I capital to risk weighted assets		2,048,422	1,936,209
Tier I capital to average assets	[1]	$ 2,048,545	$ 1,936,313
Actual
Total capital to risk weighted assets (as percent)		11.20%	11.30%
Tier I capital to risk weighted assets (as percent)		10.20%	10.30%
Common Equity Tier I capital to risk weighted assets (as percent)		10.20%	10.30%
Tier I capital to average assets (as percent)	[1]	9.70%	9.70%
Minimum Capital Requirement
Total capital to risk weighted assets		$ 1,607,173	$ 1,504,765
Tier I capital to risk weighted assets		1,205,380	1,128,574
Common Equity Tier I capital		904,035	846,430
Tier I capital to average assets	[1]	$ 847,932	$ 796,235
Minimum Capital Requirement
Total capital to risk weighted assets (as percent)		8.00%	8.00%
Tier I capital to risk weighted assets (as percent)		6.00%	6.00%
Common Equity Tier I capital to risk weighted assets (as percent)		4.50%	4.50%
Tier I capital to average assets (as percent)	[1]	4.00%	4.00%
Minimum To Be Well-Capitalized
Total capital to risk weighted assets		$ 2,008,966	$ 1,880,956
Tier I capital to risk weighted assets		1,607,173	1,504,765
Common Equity Tier I capital to risk weighted assets		1,305,828	1,222,621
Tier I capital to average assets	[1]	$ 1,059,915	$ 995,294
Minimum To Be Well-Capitalized
Total capital to risk weighted assets (as percent)		10.00%	10.00%
Tier I capital to risk weighted assets (as percent)		8.00%	8.00%
Common Equity Tier I capital to risk weighted assets (as percent)		6.50%	6.50%
Tier I capital to average assets (as percent)	[1]	5.00%	5.00%
[1] (*) Average assets for the above calculations were based on the most recent quarter.

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