Stock Options and Restricted Shares - Restricted Share Unit Awards Outstanding (Details)	6 Months Ended
	Jun. 30, 2017 shares
2017 Restricted granted shares | Tranche 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	3 years
2017 Restricted granted shares | Tranche 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	2 years
2017 Restricted granted shares | Tranche 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	1 year
2017 Restricted granted shares | Named Executive Officers (NEOs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	72,537	[1]
2017 Restricted granted shares | Named Executive Officers (NEOs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	109,339	[1]
2017 Restricted granted shares | Leadership Team other than NEOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	24,916
2016 Restricted granted shares | Tranche 2016 (1)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	3 years
2016 Restricted granted shares | Tranche 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	2 years
2016 Restricted granted shares | Tranche 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	1 year
2016 Restricted granted shares | Named Executive Officers (NEOs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	73,474	[1]
2016 Restricted granted shares | Named Executive Officers (NEOs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	110,223	[1]
2016 Restricted granted shares | Leadership Team other than NEOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	26,683
2015 Restricted granted shares | Tranche 2015 (1)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	3 years
2015 Restricted granted shares | Tranche 2016 (1)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	2 years
2015 Restricted granted shares | Tranche 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years
Subsequent holding period per tranche (in years)	1 year
2015 Restricted granted shares | Named Executive Officers (NEOs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	58,200	[1]
2015 Restricted granted shares | Named Executive Officers (NEOs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	101,850	[1]
2015 Restricted granted shares | Leadership Team other than NEOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	28,378
2014 Restricted granted shares | Tranche 2014 (1)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	5 years	[2]
Shares settled into RSAs as of period end (in shares)	21,856	[2],[3]
2014 Restricted granted shares | Tranche 2014 (2)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	4 years	[2]
Shares settled into RSAs as of period end (in shares)	21,856	[2],[3]
2014 Restricted granted shares | Tranche 2015 (1)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	4 years	[2]
Shares settled into RSAs as of period end (in shares)	21,847	[2],[3]
2014 Restricted granted shares | Tranche 2015 (2)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	3 years	[2]
Shares settled into RSAs as of period end (in shares)	21,847	[2],[3]
2014 Restricted granted shares | Tranche 2016 (1)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	3 years	[2]
Shares settled into RSAs as of period end (in shares)	21,840	[2],[3]
2014 Restricted granted shares | Tranche 2016 (2)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period per tranche (in years)	2 years	[2]
Shares settled into RSAs as of period end (in shares)	21,840	[2],[3]
2014 Restricted granted shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	102,209	[1],[2]
2014 Restricted granted shares | Leadership Team other than NEOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	29,087	[2]
2014 Restricted granted shares | Leadership Team other than NEOs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	58,404	[1],[2]

[1] The named executive officers are awarded a range of awards that may be earned based on attainment of goals between a target level of performance and a maximum level of performance.

[2] Restrictions on half of the shares previously converted to RSAs will lapse commensurate with the filing of the Form 10-K for the year ended December 31, 2017 and 2018, respectively.

[3] Restricted share unit awards granted in 2017, 2016 and 2015 will be earned if certain performance targets are achieved and thereafter will be settled in shares of Pinnacle Financial common stock, for which additional forfeiture restrictions may lapse based on Pinnacle Financial's performance in future periods.