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Stock Options, Restricted Shares and Restricted Share Units (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Number [Roll Forward] |  |  |  |  |  |
Outstanding, Beginning Balance (in shares) |  |  | 119,274 | 178,591 | 276,468 |
Granted (in shares) |  |  | 0 | 0 | 0 |
Exercised (in shares) |  |  | (17,505) | (59,317) | (97,877) |
Forfeited (in shares) |  |  | 0 | 0 | 0 |
Outstanding, Ending Balance (in shares) |  |  | 101,769 | 119,274 | 178,591 |
Options exercisable (in shares) |  |  |  |  |  | 101,769
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Outstanding, Beginning Balance (in dollars per share) |  |  | $ 23.45 | $ 22.77 | $ 21.40 |
Granted (in dollars per share) |  |  | 0 | 0 | 0 |
Exercised (in dollars per share) |  |  | 23.40 | 21.40 | 18.91 |
Forfeited (in dollars per share) |  |  | 0 | 0 | 0 |
Outstanding, Ending Balance (in dollars per share) |  |  | $ 23.46 | $ 23.45 | $ 22.77 |
Options exercisable (in dollars per share) |  |  |  |  |  | $ 23.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |  |
Outstanding |  |  | 1 year 10 months 9 days |  |  |
Options exercisable |  |  | 1 year 10 months 9 days |  |  |
Aggregate intrinsic value [Abstract] |  |  |  |  |  |
Outstanding | [1] |  |  |  |  | $ 4,169,000
Options exercisable | [1] |  |  |  |  | $ 4,169,000
Quoted closing price of common stock (in dollars per share) |  |  |  |  |  | $ 64.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | $ (350,000) | $ (2,300,000) | $ (2,700,000) |
Share-based Compensation [Abstract] |  |  |  |  |  |
Restricted stock expense |  |  | 18,737,000 | 21,226,000 | 17,636,000 |
Income tax benefit |  |  | 4,898,000 | 5,548,000 | 4,610,000 |
Restricted stock expense, net of income tax benefit |  |  | $ 13,839,000 | $ 15,678,000 | $ 13,026,000 |
Unrecognized restricted share expense |  |  |  |  |  | $ 38,700,000
Weighted average period over which unrecognized restricted share expense will be recognized |  |  | 1 year 11 months 4 days |  |  |
Number [Roll Forward] |  |  |  |  |  |
Unvested, beginning of period (in shares) |  |  | 555,296 | 692,806 | 936,135 |
Shares awards |  |  | 284,904 | 245,845 | 180,450 |
Conversion of previously awarded restricted share units to restricted share awards |  |  |  |  | 6,200 |
Restrictions lapsed and shares released to associates/directors (in shares) |  |  | (215,846) | (348,145) | (400,820) |
Shares forfeited (in shares) |  |  | (29,685) | (35,210) | (29,159) |
Unvested, end of period (in shares) |  |  | 594,669 | 555,296 | 692,806 |
Grant date weighted average cost [Roll Forward] |  |  |  |  |  |
Unvested, beginning of period (in dollars per share) |  |  | $ 57.04 | $ 55.19 | $ 50.08 |
Shares awarded (in dollars per share) |  |  | 55.91 | 55.25 | 62.40 |
Conversion of restricted share units to restricted share awards (in dollars per share) |  |  |  |  | 67.85 |
Restrictions lapsed and shares released to associates/directors (in dollars per share) |  |  | 55.39 | 40.47 | 46.33 |
Shares forfeited (in dollars per share) |  |  | 59.64 | 58.22 | 59.51 |
Unvested, end of period (in dollars per share) |  |  | $ 56.97 | $ 57.04 | $ 55.19 |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards |  |  | 284,904 | 245,845 | 180,450 |
Shares forfeited (in shares) |  |  | (29,685) | (35,210) | (29,159) |
Shares Unvested (in shares) |  |  | 594,669 | 555,296 | 692,806 | 594,669
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards |  |  | 284,904 | 245,845 | 180,450 |
Leadership Team |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards |  |  | 129,723 |  | 6,200 |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards |  |  | 129,723 |  | 6,200 |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards |  |  | 129,723 |  | 6,200 |
Restricted shares withheld for taxes and related tax benefit (in shares) |  |  | 43,996 |  | 1,860 |
Time Based Awards 2018 | Associates |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [2],[3] |  |  |  | 147,601 |
Shares forfeited (in shares) | [3],[4] |  | (17,358) |  |  |
Unvested, end of period (in shares) | [3] |  | 74,348 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [2],[3] |  |  |  | 147,601 |
Restrictions lapsed and shares released to participants (in shares) | [3] |  | 38,972 |  |  |
Shares withheld for taxes by participants (in shares) | [3] |  | 16,923 |  |  |
Shares forfeited (in shares) | [3],[4] |  | (17,358) |  |  |
Shares Unvested (in shares) | [3] |  | 74,348 |  |  | 74,348
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [2],[3] |  |  |  | 147,601 |
Time Based Awards 2018 | Associates | BNC Bancorp |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [2],[3],[5] |  |  |  | 16,777 |
Shares forfeited (in shares) | [3],[4],[5] |  | (942) |  |  |
Unvested, end of period (in shares) | [3],[5] |  | 5,204 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [2],[3],[5] |  |  |  | 16,777 |
Restrictions lapsed and shares released to participants (in shares) | [3],[5] |  | 8,683 |  |  |
Shares withheld for taxes by participants (in shares) | [3],[5] |  | 1,948 |  |  |
Shares forfeited (in shares) | [3],[4],[5] |  | (942) |  |  |
Shares Unvested (in shares) | [3],[5] |  | 5,204 |  |  | 5,204
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [2],[3],[5] |  |  |  | 16,777 |
Time Based Awards 2018 | Associates | Minimum |  |  |  |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years |  |  | 3 years |  |  |
Time Based Awards 2018 | Associates | Maximum |  |  |  |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years |  |  | 5 years |  |  |
Time Based Awards 2019 | Associates |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [2],[3] |  |  | 229,296 |  |
Shares forfeited (in shares) | [3],[4] |  | (22,543) |  |  |
Unvested, end of period (in shares) | [3] |  | 164,450 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [2],[3] |  |  | 229,296 |  |
Restrictions lapsed and shares released to participants (in shares) | [3] |  | 30,287 |  |  |
Shares withheld for taxes by participants (in shares) | [3] |  | 12,016 |  |  |
Shares forfeited (in shares) | [3],[4] |  | (22,543) |  |  |
Shares Unvested (in shares) | [3] |  | 164,450 |  |  | 164,450
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [2],[3] |  |  | 229,296 |  |
Time Based Awards 2019 | Associates | Minimum |  |  |  |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years |  |  | 3 years |  |  |
Time Based Awards 2019 | Associates | Maximum |  |  |  |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years |  |  | 5 years |  |  |
Time Based Awards 2020 | Associates |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [2],[3] |  | 266,379 |  |  |
Shares forfeited (in shares) | [3],[4] |  | (7,573) |  |  |
Unvested, end of period (in shares) | [3] |  | 254,430 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [2],[3] |  | 266,379 |  |  |
Restrictions lapsed and shares released to participants (in shares) | [3] |  | 3,034 |  |  |
Shares withheld for taxes by participants (in shares) | [3] |  | 1,342 |  |  |
Shares forfeited (in shares) | [3],[4] |  | (7,573) |  |  |
Shares Unvested (in shares) | [3] |  | 254,430 |  |  | 254,430
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [2],[3] |  | 266,379 |  |  |
Time Based Awards 2020 | Associates | Minimum |  |  |  |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years | [3] |  | 3 years |  |  |
Time Based Awards 2020 | Associates | Maximum |  |  |  |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years | [3] |  | 5 years |  |  |
Outside Director Awards 2018 |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [2],[6] |  |  |  | 16,072 |
Shares forfeited (in shares) | [4],[6] |  | 0 |  |  |
Unvested, end of period (in shares) | [6] |  | 0 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years |  |  |  |  | 1 year |
Shares awards | [2],[6] |  |  |  | 16,072 |
Restrictions lapsed and shares released to participants (in shares) | [6] |  | 12,783 |  |  |
Shares withheld for taxes by participants (in shares) | [6] |  | 3,289 |  |  |
Shares forfeited (in shares) | [4],[6] |  | 0 |  |  |
Shares Unvested (in shares) | [6] |  | 0 |  |  | 0
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [2],[6] |  |  |  | 16,072 |
Outside Director Awards 2019 |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [2],[6] |  |  | 16,549 |  |
Shares forfeited (in shares) | [4],[6] |  | 0 |  |  |
Unvested, end of period (in shares) | [6] |  | 0 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years |  |  |  | 1 year |  |
Shares awards | [2],[6] |  |  | 16,549 |  |
Restrictions lapsed and shares released to participants (in shares) | [6] |  | 14,582 |  |  |
Shares withheld for taxes by participants (in shares) | [6] |  | 1,967 |  |  |
Shares forfeited (in shares) | [4],[6] |  | 0 |  |  |
Shares Unvested (in shares) | [6] |  | 0 |  |  | 0
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [2],[6] |  |  | 16,549 |  |
Outside Director Awards 2020 |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [2],[6] |  | 18,525 |  |  |
Shares forfeited (in shares) | [4],[6] |  | 0 |  |  |
Unvested, end of period (in shares) | [6] |  | 18,525 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Vesting Period in years |  |  | 1 year |  |  |
Shares awards | [2],[6] |  | 18,525 |  |  |
Restrictions lapsed and shares released to participants (in shares) | [6] |  | 0 |  |  |
Shares withheld for taxes by participants (in shares) | [6] |  | 0 |  |  |
Shares forfeited (in shares) | [4],[6] |  | 0 |  |  |
Shares Unvested (in shares) | [6] |  | 18,525 |  |  | 18,525
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [2],[6] |  | 18,525 |  |  |
2020 Restricted Share Units | Senior Executive Officers | Minimum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 136,137 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 136,137 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 136,137 |  |  |
2020 Restricted Share Units | Senior Executive Officers | Maximum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 204,220 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 204,220 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 204,220 |  |  |
2020 Restricted Share Units | Leadership Team |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 59,648 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 59,648 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 59,648 |  |  |
2019 Restricted Share Unit | Senior Executive Officers | Minimum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 166,211 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 166,211 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 166,211 |  |  |
2019 Restricted Share Unit | Senior Executive Officers | Maximum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 249,343 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 249,343 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 249,343 |  |  |
2019 Restricted Share Unit | Leadership Team |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 52,244 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 52,244 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 52,244 |  |  |
2018 Restricted Share Units | Senior Executive Officers | Minimum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 96,878 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 96,878 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 96,878 |  |  |
2018 Restricted Share Units | Senior Executive Officers | Maximum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 145,339 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 145,339 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 145,339 |  |  |
2018 Restricted Share Units | Leadership Team |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 25,990 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 25,990 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 25,990 |  |  |
2017 Restricted Share Units | Senior Executive Officers | Minimum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 72,537 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 72,537 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 72,537 |  |  |
2017 Restricted Share Units | Senior Executive Officers | Maximum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 109,339 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 109,339 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 109,339 |  |  |
2017 Restricted Share Units | Leadership Team |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 24,916 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 24,916 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 24,916 |  |  |
2016 Restricted Share Units | Senior Executive Officers | Minimum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 73,474 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 73,474 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 73,474 |  |  |
2016 Restricted Share Units | Senior Executive Officers | Maximum |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 110,223 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 110,223 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 110,223 |  |  |
2016 Restricted Share Units | Leadership Team |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Shares awards | [7] |  | 26,683 |  |  |
Restricted stock grants grouped by similar vesting criteria [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 26,683 |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Shares awards | [7] |  | 26,683 |  |  |
Non qualified stock options |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Options exercisable (in shares) |  |  |  |  |  | 55,759
Incentive stock option |  |  |  |  |  |
Number [Roll Forward] |  |  |  |  |  |
Options exercisable (in shares) |  |  |  |  |  | 46,010
Tranche 2022 | 2020 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 1 year |  |  |
Tranche 2021 | 2020 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 2 years |  |  |
Tranche 2021 | 2019 Restricted Share Unit |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 1 year |  |  |
Tranche 2020 | 2020 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 3 years |  |  |
Tranche 2020 | 2019 Restricted Share Unit |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 2 years |  |  |
Tranche 2020 | 2018 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 1 year |  |  |
Tranche 2019 | 2019 Restricted Share Unit |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 3 years |  |  |
Tranche 2019 | 2018 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 2 years |  |  |
Tranche 2019 | 2017 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 1 year |  |  |
Tranche 2018 | 2018 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 3 years |  |  |
Tranche 2018 | 2017 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 2 years |  |  |
Tranche 2018 | 2016 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 1 year |  |  |
Tranche 2017 | 2017 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 3 years |  |  |
Tranche 2017 | 2016 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 2 years |  |  |
Tranche 2016 | 2016 Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Stock Units [Abstract] |  |  |  |  |  |
Service period per tranche (in years) |  |  | 2 years |  |  |
Subsequent holding period per tranche (in years) |  |  | 3 years |  |  |
Equity Incentive Plan 2018 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 800,554
CapitalMark Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Acquisitions in Period |  | 858,000 |  |  |  |
[1] | The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted price of Pinnacle Financial Common Stock of $64.40 per common share at December 31, 2020 for the 101,769 options that were in-the-money at December 31, 2020.
[2] | Groups include employees (referred to as associates above) and outside directors. When the restricted shares are awarded, a participant receives voting rights and forfeitable dividend rights with respect to the shares, but is not able to transfer the shares until the restrictions have lapsed. Once the restrictions lapse, the participant is taxed on the value of the award and may elect to sell some shares (or have Pinnacle Financial withhold some shares) to pay the applicable income taxes associated with the award. Alternatively, the recipient can pay the withholding taxes in cash. For time-based vesting restricted share awards, dividends paid on shares for which the forfeiture restrictions do not lapse will be recouped by Pinnacle Financial at the time of termination. For awards to Pinnacle Financial's directors, dividends are placed into escrow until the forfeiture restrictions on such shares lapse.
[3] | The forfeiture restrictions on these restricted share awards lapse in equal annual installments on the anniversary date of the grant.
[4] | These shares represent forfeitures resulting from recipients whose employment or board membership is terminated during each of the years in the three-year period ended December 31, 2020 or for which the performance criteria applicable to the award are not achieved. Any dividends paid on shares for which the forfeiture restrictions do not lapse will be recouped by Pinnacle Financial at the time of termination or will not be distributed from escrow, as applicable.
[5] | Restricted share awards issued to associates that were former associates of BNC and to Pinnacle Financial's Chairman of the Carolinas and Virginia pursuant to legacy BNC incentive plans assumed by Pinnacle Financial.
[6] | Restricted share awards are issued to the outside members of the board of directors in accordance with their board compensation plan. Restrictions on those awards granted in 2020 lapse on February 28, 2021 based on each individual board member meeting their attendance goals for the various board and board committee meetings to which each member was scheduled to attend.
[7] | The named executive officers are awarded a range of awards that may be earned based on attainment of goals at a target level of performance to a maximum level of performance.

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