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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Apr. 30, 2025 shares | Mar. 31, 2024 shares | Jun. 30, 2025 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) company $ / shares shares | Jun. 30, 2024 USD ($) | Dec. 31, 2024 $ / shares shares | Dec. 31, 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 |  | 10,000,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |
Preferred stock, shares outstanding (in shares) |  |  | 0 |  | 0 |  | 0 |
Preferred stock, shares issued (in shares) |  |  | 0 |  | 0 |  | 0 |
Common stock, shares authorized (in shares) |  |  | 50,000,000 |  | 50,000,000 |  | 50,000,000 |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |
Balance, beginning of period (in shares) |  |  | 27,834,525 |  | 27,834,525 |  | 27,709,679 |
Common stock, shares issued (in shares) |  |  | 27,834,525 |  | 27,834,525 |  | 27,709,679 |
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 | Fourth 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% |  |  |
Performance-based restricted stock | April 2024 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested stock options granted | $ |  |  | $ 1,743 |  | $ 1,743 |  |  |
Awards expected to issue (in shares) |  |  | 84,150 |  | 84,150 |  |  |
Performance-based restricted stock | May 2023 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested stock options granted | $ |  |  | $ 545 |  | $ 545 |  |  |
Awards expected to issue (in shares) |  |  | 77,873 |  | 77,873 |  |  |
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 |  | 1,977,292 |  |  |
Intrinsic value of the stock options | $ |  |  | $ 10,319 | $ 17,439 | $ 10,319 | $ 17,439 |  |
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
Restricted stock grant activity, net of forfeitures (in shares) |  | 11,739 | 40,351 |  | 44,627 |  |  |
Total unrecognized compensation cost related to non-vested stock options granted | $ |  |  | $ 1,170 |  | $ 1,170 |  |  |
Forfeiture of restricted stock grants (in shares) |  |  | 2,558 |  | 2,558 |  |  |
FirstSun Capital Bancorp 2021 Equity Incentive Plan | April 2025 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested stock options granted | $ |  |  | $ 4,703 |  | $ 4,703 |  |  |
FirstSun Capital Bancorp 2021 Equity Incentive Plan | Restricted Stock - Service Condition |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted stock grant activity, net of forfeitures (in shares) | 71,012 |  |  |  |  |  |  |
FirstSun Capital Bancorp 2021 Equity Incentive Plan | Restricted Stock - Market Condition and Service Condition |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted stock grant activity, net of forfeitures (in shares) | 71,001 |  |  |  |  |  |  |
FirstSun Capital Bancorp 2017 And 2021 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based payment arrangement, compensation cost | $ |  |  | 1,056 | 772 | 1,692 | 1,264 |  |
Pioneer's Option Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Intrinsic value of the stock options | $ |  |  | $ 868 | $ 1,243 | $ 868 | $ 1,243 |  |

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