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Stockholders' Equity - Narrative (Details) | 1 Months Ended | 12 Months Ended
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May 31, 2023 shares | May 31, 2022 shares | Dec. 31, 2023 USD ($) company $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) 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 outstanding (in shares) |  |  | 0 | 0 |
Preferred stock, shares issued (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) |  |  | 24,960,639 | 24,920,984 |
Balance, beginning of period (in shares) |  |  | 24,960,639 | 24,920,984 |
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 | $ |  |  | $ 26,000,000 | $ 8,000,000 | $ 0
Share-based payment arrangement, compensation cost | $ |  |  | $ 2,127,000 | 1,448,000 | $ 2,998,000
Option awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award contractual term |  |  | 10 years |  |
Granted (in shares) |  |  | 0 |  |
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 | $ |  |  | $ 135,000 |  |
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 | $ |  |  | $ 2,052,000 |  |
Awards expected to issue (in shares) |  |  | 97,694 |  |
Performance-based restricted stock | May 2022 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost related to non-vested stock options granted | $ |  |  | $ 879,000 |  |
Awards expected to issue (in shares) |  |  | 59,099 |  |
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 | $ |  |  | $ 136,000 |  |
Total unrecognized compensation cost related to non-vested stock options granted, period |  |  | 2 years |  |
Intrinsic value of the stock options | $ |  |  | $ 16,392,000 | 21,216,000 |
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) | 15,007 | 11,344 |  |  |
Pioneer's Option Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Intrinsic value of the stock options | $ |  |  | 1,239,000 | 2,263,000 |
Bank |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payments of dividends | $ |  |  | $ 595,000 | $ 700,000 | $ 0

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