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Stockholders' Equity - Narrative (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2022 USD ($) shares | Dec. 31, 2022 USD ($) company $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Oct. 18, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 10,000,000 | 10,000,000 |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 | $ 0.0001 |  |
Preferred stock, shares issued (in shares) |  | 0 | 0 |  |
Preferred stock, shares outstanding (in shares) |  | 0 | 0 |  |
Common stock, shares authorized (in shares) |  | 50,000,000 | 50,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 | $ 0.0001 |  |
Common stock, shares issued (in shares) |  | 24,920,984 | 19,903,342 |  |
Common stock, shares outstanding (in shares) |  | 24,920,984 | 18,346,288 |  |
Stock repurchase program, shares Held-in-treasury per share (in dollars per share) | $ / shares |  | $ 24.50 |  |  |
Dividends, term without prior regulatory approval, preceding period of net income |  | 2 years |  |  |
Payments of dividends | $ |  | $ 8,000 | $ 0 | $ 0 |
Granted (in shares) |  | 0 | 26,336 |  |
Share-based payment arrangement, compensation cost | $ |  | $ 1,448,000 | $ 2,998,000 | $ 2,335,000 |
Option awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award contractual term |  | 10 years |  |  |
Option awards | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected volatility, number of comparable companies | company |  | 25 |  |  |
Option awards | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected volatility, number of comparable companies | company |  | 30 |  |  |
Option awards | First Anniversaries |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
Option awards | Second Anniversaries |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
Option awards | Third Anniversaries |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
Option awards | Fourth Anniversaries |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost related to non-vested stock options granted | $ |  | $ 236,000 |  |  |
Performance-based restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost related to non-vested stock options granted | $ |  | $ 1,853,000 |  |  |
Awards expected to issue (in shares) |  | 69,261,000 |  |  |
FirstSun Capital Bancorp 2017 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate shares of common stock (in shares) |  | 1,977,292 |  |  |
Total unrecognized compensation cost related to non-vested stock options granted | $ |  | $ 600,000 |  |  |
Total unrecognized compensation cost related to non-vested stock options granted, period |  | 2 years 5 months 1 day |  |  |
Intrinsic value of the stock options | $ |  | $ 21,216,000 | $ 18,042,000 |  |
FirstSun Capital Bancorp 2021 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate shares of common stock (in shares) |  |  |  |  | 2,476,571
Issuance of common stock on restricted stock grants (in shares) | 11,344,000 |  |  |  |
FirstSun Capital Bancorp 2021 Equity Incentive Plan | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of awards | $ | $ 405,000 |  |  |  |
Pioneer's Option Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Intrinsic value of the stock options | $ |  | 2,263,000 |  |  |
Logia |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payments of dividends | $ |  | $ 700,000 |  |  |

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