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Regulatory Matters (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2013
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		$ 833,130,000	$ 519,144,000
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries		$ 83,100,000
Dividends Payable, Amount Per Share		$ 0.16		$ 0.14	$ 0.12	$ 0.08
Pinnacle Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings		$ 510,200,000
Actual Amount
Total capital to risk weighted assets:		2,432,419,000	2,134,344,000
Tier I capital to risk weighted assets:		2,218,003,000	1,936,313,000
Common Equity Tier I Capital to risk weighted assets		2,217,880,000	1,936,209,000
Tier I capital to average assets (*):	[1]	$ 2,218,003,000	$ 1,936,313,000
Actual Ratios
Total capital to risk weighted assets:		11.5414%	11.3471%
Tier I capital to risk weighted assets:		10.524%	10.2943%
Common Equity Tier I Capital to Risk Weighted Assets		10.5235%	10.2938%
Tier I capital to average assets (*):	[1]	9.80%	9.7273%
Minimum Capital Requirement
Total capital to risk weighted assets:		$ 1,686,046,000	$ 1,504,765,000
Tier I capital to risk weighted assets:		1,264,535,000	1,128,574,000
Common Equity Tier I Risk Based Capital to risk weighted assets		948,401,000	846,430,000
Tier I capital to average assets (*):	[1]	$ 906,185,000	$ 796,235,000
Minimum Capital Requirement - Ratios
Total capital to risk weighted assets:		8.00%	8.00%
Tier I capital to risk weighted assets:		6.00%	6.00%
Common Equity Tier I Risk Based Capital to risk weighted assets:		4.50%	4.50%
Tier I capital to average assets (*):	[1]	4.00%	4.00%
Minimum To Be Well Capitalized
Total capital to risk weighted assets:		$ 2,107,558,000	$ 1,880,956,000
Tier I capital to risk weighted assets:		1,686,046,000	1,504,765,000
Common Equity Tier I capital to risk weighted assets		1,369,912,000	1,222,621,000
Tier I capital to average assets (*):	[1]	$ 1,132,731,000	$ 995,294,000
Minimum To Be Well Capitalized - Ratios
Total capital to risk weighted assets:		10.00%	10.00%
Tier I capital to risk weighted assets:		8.00%	8.00%
Common Equity Tier I capital to risk weighted assets:		6.50%	6.50%
Tier I capital to average assets (*):	[1]	5.00%	5.00%
Pinnacle Financial
Actual Amount
Total capital to risk weighted assets:		$ 2,580,143,000	$ 2,266,161,000
Tier I capital to risk weighted assets:		2,024,193,000	1,725,323,000
Common Equity Tier I Capital to risk weighted assets		2,024,070,000	1,725,219,000
Tier I capital to average assets (*):	[1]	$ 2,024,193,000	$ 1,725,323,000
Actual Ratios
Total capital to risk weighted assets:		12.2063%	12.0102%
Tier I capital to risk weighted assets:		9.5762%	9.1438%
Common Equity Tier I Capital to Risk Weighted Assets		9.5756%	9.1433%
Tier I capital to average assets (*):	[1]	8.90%	8.6497%
Minimum Capital Requirement
Total capital to risk weighted assets:		$ 1,691,017,000	$ 1,509,496,000
Tier I capital to risk weighted assets:		1,268,263,000	1,132,122,000
Common Equity Tier I Risk Based Capital to risk weighted assets		951,197,000	849,092,000
Tier I capital to average assets (*):	[1]	$ 909,102,000	$ 797,861,000
Minimum Capital Requirement - Ratios
Total capital to risk weighted assets:		8.00%	8.00%
Tier I capital to risk weighted assets:		6.00%	6.00%
Common Equity Tier I Risk Based Capital to risk weighted assets:		4.50%	4.50%
Tier I capital to average assets (*):	[1]	4.00%	4.00%
[1] (*) Average assets for the above calculations were based on the most recent quarter.

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