Investments in Affiliated Companies and Subordinated Debt, 2 (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Combined Summary Balance Sheets [Abstract]
Liabilities																$ 7,559,802,880	$ 5,215,554,416
Stockholders' equity	$ 1,155,611,300			$ 802,693,381	$ 802,693,381			$ 723,707,661	$ 723,707,661			$ 679,071,359	$ 1,155,611,300	$ 802,693,381	$ 723,707,661	1,155,611,300	802,693,381
Total liabilities and stockholders' equity																$ 8,715,414,180	6,018,247,797
Percentage of common security owned by parent																100.00%
Combined Summary Income Statements [Abstract]
Net income (loss)	26,854,000	$ 24,149,000	$ 22,665,000	21,843,000	18,737,000	$ 18,197,000	$ 17,170,000	16,367,000	15,321,000	$ 14,647,000	$ 14,311,000	13,448,000	95,509,402	70,471,167	57,726,201
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				802,693,381				723,707,661				679,071,359	802,693,381	723,707,661	679,071,359
Net income (loss)	26,854,000	$ 24,149,000	$ 22,665,000	21,843,000	18,737,000	$ 18,197,000	$ 17,170,000	16,367,000	15,321,000	$ 14,647,000	$ 14,311,000	13,448,000	95,509,402	70,471,167	57,726,201
Dividends [Abstract]
Common- paid to Pinnacle Financial													18,307,075	11,398,285	2,814,691
Ending Balances	1,155,611,300				802,693,381				723,707,661				1,155,611,300	802,693,381	723,707,661
Common Stock [Member]
Combined Summary Balance Sheets [Abstract]
Stockholders' equity	40,906,064			35,732,483	35,732,483			35,221,941	35,221,941			34,696,597	35,732,483	35,732,483	35,221,941	$ 40,906,064	35,732,483
Combined Summary Income Statements [Abstract]
Net income (loss)													0		0
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				35,732,483				35,221,941				34,696,597	35,732,483	35,221,941	34,696,597
Net income (loss)													0		0
Dividends [Abstract]
Common- paid to Pinnacle Financial													0		0
Ending Balances	40,906,064				35,732,483				35,221,941				40,906,064	35,732,483	35,221,941
Retained Earnings [Member]
Combined Summary Balance Sheets [Abstract]
Stockholders' equity	278,573,408			201,371,081	201,371,081			142,298,199	142,298,199			87,386,689	201,371,081	201,371,081	87,386,689	278,573,408	201,371,081
Combined Summary Income Statements [Abstract]
Net income (loss)													95,509,402	70,471,167	57,726,201
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				201,371,081				142,298,199				87,386,689	201,371,081	142,298,199	87,386,689
Net income (loss)													95,509,402	70,471,167	57,726,201
Dividends [Abstract]
Common- paid to Pinnacle Financial													18,307,075	11,398,285	2,814,691
Ending Balances	278,573,408				201,371,081				142,298,199				278,573,408	201,371,081	142,298,199
Trust [Member]
Combined Summary Balance Sheets [Abstract]
Asset - Investment in subordinated debentures issued by Pinnacle Financial																82,476,000	82,476,000
Liabilities																0	0
Stockholder's equity - Trust preferred securities																80,000,000	80,000,000
Common securities (100% owned by Pinnacle Financial)																2,476,000	2,476,000
Stockholders' equity	82,476,000			82,476,000	82,476,000			82,476,000	82,476,000			82,476,000	82,476,000	82,476,000	82,476,000	82,476,000	82,476,000
Total liabilities and stockholders' equity																82,476,000	82,476,000
Combined Summary Income Statements [Abstract]
Income - Interest income from subordinated debentures issued by Pinnacle Financial													2,068,000	2,020,000	2,057,000
Net income (loss)													2,068,000	2,020,000	2,057,000
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				82,476,000				82,476,000				82,476,000	82,476,000	82,476,000	82,476,000
Net income (loss)													2,068,000	2,020,000	2,057,000
Issuance of trust preferred securities													0	0	0
Dividends [Abstract]
Trust preferred securities													(2,006,000)	(1,957,000)	(1,995,000)
Common- paid to Pinnacle Financial													(62,000)	(63,000)	(62,000)
Ending Balances	82,476,000				82,476,000				82,476,000				82,476,000	82,476,000	82,476,000
Trust [Member] | Trust Preferred Securities [Member]
Combined Summary Balance Sheets [Abstract]
Stockholders' equity	80,000,000			80,000,000	80,000,000			80,000,000	80,000,000			80,000,000	80,000,000	80,000,000	80,000,000	80,000,000	80,000,000
Combined Summary Income Statements [Abstract]
Net income (loss)													0	0	0
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				80,000,000				80,000,000				80,000,000	80,000,000	80,000,000	80,000,000
Net income (loss)													0	0	0
Issuance of trust preferred securities													0	0	0
Dividends [Abstract]
Trust preferred securities													0	0	0
Common- paid to Pinnacle Financial													0	0	0
Ending Balances	80,000,000				80,000,000				80,000,000				80,000,000	80,000,000	80,000,000
Trust [Member] | Common Stock [Member]
Combined Summary Balance Sheets [Abstract]
Stockholders' equity	2,476,000			2,476,000	2,476,000			2,476,000	2,476,000			2,476,000	2,476,000	2,476,000	2,476,000	2,476,000	2,476,000
Combined Summary Income Statements [Abstract]
Net income (loss)													0	0	0
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				2,476,000				2,476,000				2,476,000	2,476,000	2,476,000	2,476,000
Net income (loss)													0	0	0
Issuance of trust preferred securities													0	0	0
Dividends [Abstract]
Trust preferred securities													0	0	0
Common- paid to Pinnacle Financial													0	0	0
Ending Balances	2,476,000				2,476,000				2,476,000				2,476,000	2,476,000	2,476,000
Trust [Member] | Retained Earnings [Member]
Combined Summary Balance Sheets [Abstract]
Stockholders' equity	0			0	0			0	0			0	0	0	0	$ 0	$ 0
Combined Summary Income Statements [Abstract]
Net income (loss)													2,068,000	2,020,000	2,057,000
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				$ 0				$ 0				$ 0	0	0	0
Net income (loss)													2,068,000	2,020,000	2,057,000
Issuance of trust preferred securities													0	0	0
Dividends [Abstract]
Trust preferred securities													(2,006,000)	(1,957,000)	(1,995,000)
Common- paid to Pinnacle Financial													(62,000)	(63,000)	(62,000)
Ending Balances	$ 0				$ 0				$ 0				$ 0	$ 0	$ 0