Investments in Affiliated Companies and Subordinated Debt, 2 (Details) (USD $)	3 Months Ended												12 Months Ended
	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, 2012	Sep. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Combined Summary Balance Sheets [Abstract]
Liabilities	$ 5,215,554,416				$ 4,840,068,196								$ 5,215,554,416	$ 4,840,068,196
Stockholders' equity	802,693,381				723,707,661				679,071,359				802,693,381	723,707,661	679,071,359
Total liabilities and stockholders' equity	6,018,247,797				5,563,775,857								6,018,247,797	5,563,775,857
Percentage of common security owned by parent (in hundredths)	100.00%												100.00%
Combined Summary Income Statements [Abstract]
Net income (loss)	18,737,000	18,197,000	17,170,000	16,367,000	15,321,000	14,647,000	14,311,000	13,448,000	11,730,000	11,349,000	8,365,000	10,440,000	70,471,167	57,726,201	41,883,881
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				723,707,661				679,071,359			710,144,568		723,707,661	679,071,359	710,144,568
Net income (loss)	18,737,000	18,197,000	17,170,000	16,367,000	15,321,000	14,647,000	14,311,000	13,448,000	11,730,000	11,349,000	8,365,000	10,440,000	70,471,167	57,726,201	41,883,881
Dividends [Abstract]
Common- paid to Pinnacle Financial													11,398,285	2,814,691	0
Ending Balances	802,693,381				723,707,661				679,071,359				802,693,381	723,707,661	679,071,359
Common Stock [Member]
Combined Summary Balance Sheets [Abstract]
Stockholders' equity	35,732,483								34,696,597				35,732,483		34,696,597
Combined Summary Income Statements [Abstract]
Net income (loss)													0		0
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				35,221,941							34,354,960		35,221,941		34,354,960
Net income (loss)													0		0
Dividends [Abstract]
Common- paid to Pinnacle Financial													0
Ending Balances	35,732,483								34,696,597				35,732,483		34,696,597
Retained Earnings [Member]
Combined Summary Balance Sheets [Abstract]
Stockholders' equity	201,371,081				142,298,199				87,386,689				201,371,081	142,298,199	87,386,689
Combined Summary Income Statements [Abstract]
Net income (loss)													70,471,167	57,726,201	41,883,881
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				142,298,199				87,386,689			49,783,584		142,298,199	87,386,689	49,783,584
Net income (loss)													70,471,167	57,726,201	41,883,881
Dividends [Abstract]
Common- paid to Pinnacle Financial													11,398,285	2,814,691
Ending Balances	201,371,081				142,298,199				87,386,689				201,371,081	142,298,199	87,386,689
Trust [Member]
Combined Summary Balance Sheets [Abstract]
Asset - Investment in subordinated debentures issued by Pinnacle Financial	82,476,000				82,476,000								82,476,000	82,476,000
Liabilities	0				0								0	0
Stockholder's equity - Trust preferred securities	80,000,000				80,000,000								80,000,000	80,000,000
Common securities (100% owned by Pinnacle Financial)	2,476,000				2,476,000								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
Total liabilities and stockholders' equity	82,476,000				82,476,000								82,476,000	82,476,000
Combined Summary Income Statements [Abstract]
Income - Interest income from subordinated debentures issued by Pinnacle Financial													2,020,000	2,057,000	2,218,000
Net income (loss)													2,020,000	2,057,000	2,218,000
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)													2,020,000	2,057,000	2,218,000
Issuance of trust preferred securities													0	0	0
Dividends [Abstract]
Trust preferred securities													(1,957,000)	(1,995,000)	(2,151,000)
Common- paid to Pinnacle Financial													(63,000)	(62,000)	(67,000)
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
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
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
Combined Summary Income Statements [Abstract]
Net income (loss)													2,020,000	2,057,000	2,218,000
Combined Summary Statements of Stockholder's Equity [Abstract]
Balances				0				0			0		0	0	0
Net income (loss)													2,020,000	2,057,000	2,218,000
Issuance of trust preferred securities													0	0	0
Dividends [Abstract]
Trust preferred securities													(1,957,000)	(1,995,000)	(2,151,000)
Common- paid to Pinnacle Financial													(63,000)	(62,000)	(67,000)
Ending Balances	$ 0				$ 0				$ 0				$ 0	$ 0	$ 0