| Document and Entity Information | 12 Months Ended |
| Dec. 31, 2022 | |
| Cover [Abstract] | |
| Document Type | DEF 14A |
| Amendment Flag | false |
| Entity Registrant Name | CapStar Financial Holdings, Inc. |
| Entity Central Index Key | 0001676479 |
| Pay vs Performance Disclosure | 12 Months Ended | ||
| Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | |
| Pay vs Performance Disclosure [Table] | |||
| Pay vs Performance [Table Text Block] | As required by Item 402(u) of Regulation S-K, we are providing the following disclosure regarding executive compensation for our principal executive officer (“PEO”) and Non-PEO NEOs and Company performance for the fiscal years listed below. Year Summary Compensation Table Total Compensation for Timothy Schools¹ Compensation Actually Paid to Timothy Schools¹˒²˒³ Average Summary Compensation Table Total Compensation for Non-PEO NEOs 1 Average Compensation Actually Paid to Non-PEO NEOs 1,2,3 Value of Initial Fixed $100 Investment based on: 4 Net Income Return on Average Assets ⁵ (%) TSR Peer Group TSR (a) (b) (c) (d) (e) (f) (g) (h) (i) 2022 1,033,006 857,140 347,439 262,749 111.20 102.65 39.0 1.24 2021 1,130,435 1,554,337 506,284 580,688 130.02 113.25 48.7 1.56 2020 959,767 947,999 676,234 661,680 90.12 85.57 24.7 0.94 1. Timothy Schools was our PEO for each year presented. The individuals comprising the Non-PEO NEOs for each year presented are listed below. 2020 2021 2022 Christopher Tietz Jennie O'Bryan Michael Fowler John Davis Christopher Tietz Jennie O'Bryan Robert Anderson Denis Duncan Christopher Tietz John Davis Ken Webb Denis Duncan John Davis 2. The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table Total Compensation with certain adjustments as described in footnote 3 below. 3. Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table . Year Summary Compensation Table Total Compensation for Timothy Schools Exclusion of Stock Awards for Timothy Schools Inclusion of Equity Values for Timothy Schools Compensation Actually Paid to Timothy Schools 2022 1,033,006 ( 499,306 ) 323,440 857,140 2021 1,130,435 ( 201,749 ) 625,651 1,554,337 2020 959,767 ( 200,454 ) 188,686 947,999 Year Average Summary Compensation Table Total Compensation for Non-PEO NEOs Average Exclusion of Stock Awards for Non-PEO NEOs Average Inclusion of Equity Values for Non-PEO NEOs Average Compensation Actually Paid to Non-PEO NEOs 2022 347,439 ( 63,357 ) ( 21,333 ) 262,749 2021 506,284 ( 89,060 ) 163,464 580,688 2020 676,234 ( 49,954 ) 35,400 661,680 The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables : Year Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Timothy Schools Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Timothy Schools Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Timothy Schools Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Timothy Schools Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Timothy Schools Value of Dividends or Other Earnings Paid on Stock or Option Awards Not Otherwise Included for Timothy Schools Total - Inclusion of 2022 375,203 ( 52,027 ) 58,175 ( 57,911 ) 0 0 323,440 2021 300,546 178,700 42,898 103,507 0 0 625,651 2020 253,407 ( 23,245 ) 0 ( 41,476 ) 0 0 188,686 Year Average Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO NEOs Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs Average Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs Average Value of Dividends or Other Earnings Paid on Stock or Option Awards Not Otherwise Included for Non-PEO NEOs Total - Average Inclusion of 2022 40,681 ( 9,167 ) 8,081 ( 4,516 ) ( 56,412 ) 0 ( 21,333 ) 2021 116,658 28,186 12,839 5,781 0 0 163,464 2020 63,151 ( 4,256 ) 0 ( 23,495 ) 0 0 35,400 4. The Peer Group TSR set forth in this table utilizes the ABA Nasdaq Community Bank Index, which we also utilize in the stock performance graph required by Item 201(e) of Regulation S-K included in our Annual Report for the year ended December 31, 2022. The comparison assumes $100 was invested for the period starting December 31, 2019, through the end of the listed year in the Company and in the ABA Nasdaq Community Bank Index, respectively. Historical stock performance is not necessarily indicative of future stock performance. 5. We determined Return on Average Assets to be the most important financial performance measure used to link Company performance to Compensation Actually Paid to our PEO and Non-PEO NEOs in 2022. This performance measure may not have been the most important financial performance measure for years 2021 and 2020 and we may determine a different financial performance measure to be the most important financial performance measure in future years. | ||
| Company Selected Measure Name | Return on Average Assets | ||
| Named Executive Officers, Footnote [Text Block] | 1. Timothy Schools was our PEO for each year presented. The individuals comprising the Non-PEO NEOs for each year presented are listed below. 2020 2021 2022 Christopher Tietz Jennie O'Bryan Michael Fowler John Davis Christopher Tietz Jennie O'Bryan Robert Anderson Denis Duncan Christopher Tietz John Davis Ken Webb Denis Duncan John Davis | ||
| Peer Group Issuers, Footnote [Text Block] | 4. The Peer Group TSR set forth in this table utilizes the ABA Nasdaq Community Bank Index, which we also utilize in the stock performance graph required by Item 201(e) of Regulation S-K included in our Annual Report for the year ended December 31, 2022. The comparison assumes $100 was invested for the period starting December 31, 2019, through the end of the listed year in the Company and in the ABA Nasdaq Community Bank Index, respectively. Historical stock performance is not necessarily indicative of future stock performance. | ||
| PEO Total Compensation Amount | $ 1,033,006 | $ 1,130,435 | $ 959,767 |
| PEO Actually Paid Compensation Amount | $ 857,140 | 1,554,337 | 947,999 |
| Adjustment To PEO Compensation, Footnote [Text Block] | 3. Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table Year Summary Compensation Table Total Compensation for Timothy Schools Exclusion of Stock Awards for Timothy Schools Inclusion of Equity Values for Timothy Schools Compensation Actually Paid to Timothy Schools 2022 1,033,006 ( 499,306 ) 323,440 857,140 2021 1,130,435 ( 201,749 ) 625,651 1,554,337 2020 959,767 ( 200,454 ) 188,686 947,999 The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables Year Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Timothy Schools Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Timothy Schools Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Timothy Schools Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Timothy Schools Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Timothy Schools Value of Dividends or Other Earnings Paid on Stock or Option Awards Not Otherwise Included for Timothy Schools Total - Inclusion of 2022 375,203 ( 52,027 ) 58,175 ( 57,911 ) 0 0 323,440 2021 300,546 178,700 42,898 103,507 0 0 625,651 2020 253,407 ( 23,245 ) 0 ( 41,476 ) 0 0 188,686 | ||
| Non-PEO NEO Average Total Compensation Amount | $ 347,439 | 506,284 | 676,234 |
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 262,749 | 580,688 | 661,680 |
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | 3. Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table . Year Average Summary Compensation Table Total Compensation for Non-PEO NEOs Average Exclusion of Stock Awards for Non-PEO NEOs Average Inclusion of Equity Values for Non-PEO NEOs Average Compensation Actually Paid to Non-PEO NEOs 2022 347,439 ( 63,357 ) ( 21,333 ) 262,749 2021 506,284 ( 89,060 ) 163,464 580,688 2020 676,234 ( 49,954 ) 35,400 661,680 The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables : Year Average Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO NEOs Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs Average Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs Average Value of Dividends or Other Earnings Paid on Stock or Option Awards Not Otherwise Included for Non-PEO NEOs Total - Average Inclusion of 2022 40,681 ( 9,167 ) 8,081 ( 4,516 ) ( 56,412 ) 0 ( 21,333 ) 2021 116,658 28,186 12,839 5,781 0 0 163,464 2020 63,151 ( 4,256 ) 0 ( 23,495 ) 0 0 35,400 | ||
| Compensation Actually Paid vs. Total Shareholder Return [Text Block] | The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and the Company’s cumulative TSR over the three most recently completed fiscal years. | ||
| Compensation Actually Paid vs. Net Income [Text Block] | The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and our Net Income during the three most recently completed fiscal years. | ||
| Compensation Actually Paid vs. Company Selected Measure [Text Block] | The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and our Company-Selected Measure during the three most recently completed fiscal years. | ||
| Total Shareholder Return Vs Peer Group [Text Block] | The following chart compares our cumulative TSR over the three most recently completed fiscal years to that of the ABA Community Bank Index over the same period. | ||
| Tabular List [Table Text Block] | The following table presents the financial and non-financial performance measures that the Company considers to have been the most important in linking Compensation Actually Paid to our PEO and other NEOs for 2022 to Company performance. The measures in this table are not ranked. Return on Average Assets Operating Core Bank Pre-Tax Pre-Provision Net Income Earnings Per Share Relative Tangible Book Value Per Share Growth | ||
| Total Shareholder Return Amount | $ 111.20 | 130.02 | 90.12 |
| Peer Group Total Shareholder Return Amount | 102.65 | 113.25 | 85.57 |
| Net Income (Loss) | $ 39,000,000 | $ 48,700,000 | $ 24,700,000 |
| Company Selected Measure Amount | 0.0124 | 0.0156 | 0.0094 |
| PEO Name | Timothy Schools | Timothy Schools | Timothy Schools |
| Measure [Axis]: 1 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Return on Average Assets | ||
| Non-GAAP Measure Description [Text Block] | 5. We determined Return on Average Assets to be the most important financial performance measure used to link Company performance to Compensation Actually Paid to our PEO and Non-PEO NEOs in 2022. This performance measure may not have been the most important financial performance measure for years 2021 and 2020 and we may determine a different financial performance measure to be the most important financial performance measure in future years. | ||
| Measure [Axis]: 2 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Operating Core Bank Pre-Tax Pre-Provision Net Income | ||
| Measure [Axis]: 3 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Earnings Per Share | ||
| Measure [Axis]: 4 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Relative Tangible Book Value Per Share Growth | ||
| PEO [Member] | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | $ 375,203 | $ 300,546 | $ 253,407 |
| PEO [Member] | Exclusion of Stock Awards [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (499,306) | (201,749) | (200,454) |
| PEO [Member] | Inclusion of Equity Values [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 323,440 | 625,651 | 188,686 |
| PEO [Member] | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 0 | 0 | 0 |
| PEO [Member] | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (52,027) | 178,700 | (23,245) |
| PEO [Member] | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (57,911) | 103,507 | (41,476) |
| PEO [Member] | Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 58,175 | 42,898 | 0 |
| PEO [Member] | Value of Dividends or Other Earnings Paid on Stock or Option Awards Not Otherwise Included [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 0 | 0 | 0 |
| Non-PEO NEO [Member] | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 40,681 | 116,658 | 63,151 |
| Non-PEO NEO [Member] | Average Exclusion of Stock Awards [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (63,357) | (89,060) | (49,954) |
| Non-PEO NEO [Member] | Average Inclusion of Equity Values [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (21,333) | 163,464 | 35,400 |
| Non-PEO NEO [Member] | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (56,412) | 0 | 0 |
| Non-PEO NEO [Member] | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (9,167) | 28,186 | (4,256) |
| Non-PEO NEO [Member] | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (4,516) | 5,781 | (23,495) |
| Non-PEO NEO [Member] | Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 8,081 | 12,839 | 0 |
| Non-PEO NEO [Member] | Value of Dividends or Other Earnings Paid on Stock or Option Awards Not Otherwise Included [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | $ 0 | $ 0 | $ 0 |
