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Stockholders' Equity - Narrative (Details)	1 Months Ended		12 Months Ended
	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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