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Stockholders' Equity - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2023 | May 31, 2022 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock on restricted stock grants (in shares) |  |  |  | 15,007 |  | 11,344 |  |  |  |
Share-based payment arrangement, compensation cost |  |  |  |  |  |  | $ 1,743 | $ 1,093 |  |
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 |  |  |  | 236 |  |  |
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 |  |  | $ 2,342 |  |  |  | $ 2,342 |  |  |
Awards expected to issue (in shares) |  |  | 100,373 |  |  |  | 100,373 |  |  |
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 |  |  | $ 1,225 |  |  |  | $ 1,225 |  |  |
Awards expected to issue (in shares) |  |  | 68,881 |  |  |  | 68,881 |  |  |
Option awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 0 |  |  |
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 |  |  |
Granted (in shares) |  |  | 0 |  |  |  | 0 |  |  |
Forfeited (in shares) |  |  | 0 |  |  |  | 0 |  |  |
Stock option exercises (in shares) |  |  | 0 |  |  |  | 0 |  |  |
Total unrecognized compensation cost related to non-vested stock options granted |  |  | $ 243 |  |  |  | $ 243 |  |  |
Total unrecognized compensation cost related to non-vested stock options granted, period |  |  |  |  |  |  | 2 years |  |  |
Intrinsic value of the stock options |  |  | $ 11,891 |  |  |  | $ 11,891 |  | $ 21,216 |
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] |  |  |  |  |  |  |  |  |  |
Forfeited (in shares) |  |  | 1,044 |  |  |  | 6,525 |  |  |
Stock option exercises (in shares) |  |  | 22,972 |  |  |  | 32,107 |  |  |
Intrinsic value of the stock options |  |  | $ 823 |  |  |  | $ 823 |  | $ 2,263 |
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 |  |  | $ 660 |  | $ 473 |  |  |  |  |

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