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Regulatory Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
		Sep. 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		$ 66,000
Actual
Total capital to risk weighted assets		2,508,348	$ 2,266,161
Tier I capital to risk weighted assets		1,955,095	1,725,323
Common Equity Tier I capital to risk weighted assets		1,954,972	1,725,219
Tier I capital to average assets	[1]	$ 1,955,095	$ 1,725,323
Actual
Total capital to risk weighted assets (as percent)		12.10%	12.00%
Tier I capital to risk weighted assets (as percent)		9.40%	9.10%
Common Equity Tier I capital to risk weighted assets (as percent)		9.40%	9.10%
Tier I capital to average assets (as percent)	[1]	8.80%	8.60%
Minimum Capital Requirement
Total capital to risk weighted assets		$ 1,656,444	$ 1,509,496
Tier I capital to risk weighted assets		1,242,333	1,132,122
Common Equity Tier I capital		931,750	849,092
Tier I capital to average assets	[1]	$ 888,029	$ 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		$ 2,344,597	$ 2,134,344
Tier I capital to risk weighted assets		2,133,834	1,936,313
Common Equity Tier I capital to risk weighted assets		2,133,711	1,936,209
Tier I capital to average assets	[1]	$ 2,133,834	$ 1,936,313
Actual
Total capital to risk weighted assets (as percent)		11.40%	11.30%
Tier I capital to risk weighted assets (as percent)		10.30%	10.30%
Common Equity Tier I capital to risk weighted assets (as percent)		10.30%	10.30%
Tier I capital to average assets (as percent)	[1]	9.60%	9.70%
Minimum Capital Requirement
Total capital to risk weighted assets		$ 1,650,616	$ 1,504,765
Tier I capital to risk weighted assets		1,237,962	1,128,574
Common Equity Tier I capital		928,471	846,430
Tier I capital to average assets	[1]	$ 885,345	$ 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		$ 2,063,269	$ 1,880,956
Tier I capital to risk weighted assets		1,650,616	1,504,765
Common Equity Tier I capital to risk weighted assets		1,341,125	1,222,621
Tier I capital to average assets	[1]	$ 1,106,681	$ 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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