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Stock Options and Restricted Shares - Common Stock Options (Details) - Common stock options - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Number |  |  |  |  |
Outstanding, beginning balance (in shares) |  | 101,769 |  |  |
Granted (in shares) |  | 0 |  |  |
Exercised (in shares) |  | (13,246) |  |  |
Forfeited (in shares) |  | 0 |  |  |
Outstanding, ending balance (in shares) |  | 88,523 |  | 101,769 |
Additional disclosures |  |  |  |  |
Options exercisable (in shares) |  | 88,523 |  |  |
Weighted-average exercise price of options outstanding (in dollars per share) |  | $ 23.53 |  | $ 23.46 |
Weighted-average contractual remaining term for options outstanding |  | 1 year 7 months 17 days |  | 1 year 10 months 9 days |
Aggregate intrinsic value |  | $ 5,766 | [1] | $ 4,169 | [2]
Weighted- average exercise price of options exercisable (in dollars per share) |  | $ 23.53 |  |  |
Weighted-average contractual remaining term for options exercisable |  | 1 year 7 months 17 days |  |  |
Aggregate intrinsic value of options exercisable | [1] | $ 5,766 |  |  |
Quoted closing price of common stock (in dollars per share) |  | $ 88.66 |  | $ 64.40 |
Number of awards used in aggregate intrinsic value (in shares) |  | 88,523 |  | 101,769 |
[1] | The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted closing price of Pinnacle Financial common stock of $88.66 per common share at March 31, 2021 for the 88,523 options that were in-the-money at March 31, 2021.
[2] | The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted closing 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.

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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