Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended			9 Months Ended					9 Months Ended		12 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Not Designated as Hedging Instrument [Member]	Sep. 30, 2014 Designated as Hedging Instrument [Member]	Sep. 30, 2014 Pay Fixed / Receive Variable Swaps [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Pay Fixed / Receive Variable Swaps [Member] Not Designated as Hedging Instrument [Member]	Sep. 30, 2014 Pay Variable / Receive Fixed Swaps [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Pay Variable / Receive Fixed Swaps [Member] Not Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap April 2015 April 2018 [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2013 Interest Rate Swap April 2015 April 2018 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap October 2015 April 2019 [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2013 Interest Rate Swap October 2015 April 2019 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap October 2015 October 2019 [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2013 Interest Rate Swap October 2015 October 2019 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap April 2016 April 2020 [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2013 Interest Rate Swap April 2016 April 2020 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap April 2016 April 2022 [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2013 Interest Rate Swap April 2016 April 2022 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap October 2016 October 2020 [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2013 Interest Rate Swap October 2016 October 2020 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap July 2014 July 2021 [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2013 Interest Rate Swap July 2014 July 2021 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap July 2014 July 2022 [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2013 Interest Rate Swap July 2014 July 2022 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap July 2014 July 2023 [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2013 Interest Rate Swap July 2014 July 2023 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap July 2014 July 2024 [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2013 Interest Rate Swap July 2014 July 2024 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap October 2017 October 2021 [Member] Designated as Hedging Instrument [Member]	Nov. 05, 2014 Interest Rate Swap October 2017 October 2021 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap April 2018 July 2022 [Member] Designated as Hedging Instrument [Member]	Nov. 05, 2014 Interest Rate Swap April 2018 July 2022 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Interest Rate Swap July 2018 October 2022 [Member] Designated as Hedging Instrument [Member]	Nov. 05, 2014 Interest Rate Swap July 2018 October 2022 [Member] Designated as Hedging Instrument [Member]
Interest rate swap agreements [Abstract]
Notional Amount of Interest rate swap			$ 503,548	$ 588,972		$ 251,774	$ 294,486	$ 251,774	$ 294,486
Estimated Fair Value of Interest rate swap			(388)	(374)		12,280	13,296	(12,668)	(13,670)
Forward Cash Flow Hedge Relationship [Abstract]
Forecasted Notional Amount	310,000									33,000	[1]		33,000	[1]		33,000	[1]		33,000			34,000			34,000			27,500		27,500		27,500		27,500			33,000		33,000		33,000
Variable Interest Rate										3 month LIBOR	[1]		3 month LIBOR	[1]		3 month LIBOR	[1]		3 month LIBOR			3 month LIBOR			3 month LIBOR			1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	3 month LIBOR		3 month LIBOR		3 month LIBOR
Fixed Interest Rate										1.428%	[1]		1.857%	[1]		1.996%	[1]		2.265%			2.646%			2.523%			2.09%	2.09%	2.27%	2.27%	2.42%	2.42%	2.50%	2.50%		2.992%		3.118%		3.158%
Term, Lower Maturity Range Date					Jul. 01, 2014					Apr. 01, 2015	[1],[2]		Oct. 01, 2015	[1],[2]		Oct. 01, 2015	[1],[2]		Apr. 01, 2016	[2]		Apr. 01, 2016	[2]		Oct. 01, 2016	[2]				Jul. 01, 2014		Jul. 01, 2014				Oct. 01, 2017		Apr. 01, 2018		Jul. 01, 2018
Term, Higher Maturity Range Date					Jul. 01, 2021					Apr. 01, 2018	[1],[2]		Apr. 01, 2019	[1],[2]		Oct. 01, 2019	[1],[2]		Apr. 01, 2020	[2]		Apr. 01, 2022	[2]		Oct. 01, 2020	[2]				Jul. 01, 2024		Jul. 01, 2023				Oct. 01, 2021		Jul. 01, 2022		Oct. 01, 2022
Interest Rate Derivative Assets, at Fair Value	2,399	6,604								270	[1]	463	416	[1]	837	423	[1]	1,007	423		1,172	354		1,818	374		1,307	113	0	(47)	0	19	0	54	0
Unrealized Gain in Accumulated Other Comprehensive Income	$ 1,458	$ 4,013								$ 164	[1]	$ 281	$ 253	[1]	$ 509	$ 257	[1]	$ 612	$ 257		$ 712	$ 215		$ 1,105	$ 227		$ 794	$ 69	$ 0	$ (29)	$ 0	$ 12	$ 0	$ 33	$ 0

[1] Subsequent to September 30, 2014, Pinnacle Financial terminated the first three individual contracts of the hedge relationship. Although we continue to expect that we will need this funding source in the future, internal forecasts for future interest rates have changed since this transaction was initiated and Pinnacle Financial no longer believes these hedging instruments necessary in managing interest rate risk given internal rate forecasts for those periods. As a result of terminating these contracts, Pinnacle Financial will incur a gain of $64,000 over the original term of the agreement which begins in April 2015.

[2] No cash will be exchanged prior to the term.