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shares) Outstanding, vested, and exercisable, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Securities held-to-maturity, fair value Securities held-to-maturity, fair value Total held-to-maturity Securities held-to-maturity Debt Securities, Held-to-Maturity, Fair Value Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Loans Receivable Loans Receivable [Member] Commercial and industrial Commercial and Industrial Commercial Portfolio Segment [Member] Proceeds from the sale or redemption of other investments Proceeds from Sale and Maturity of Other Investments Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Purchased Seasoned Loans Financial Asset Acquired and No Credit Deterioration [Member] Accrued interest receivable Interest Receivable, Fair Value Disclosure Interest Receivable, Fair Value Disclosure Loan 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Rate Reduction [Member] Acquisition of First Foundation Inc. (in shares) Stock Issued During Period, Shares, Acquisitions Weighted Average Rate - Operating Leases Operating Lease, Weighted Average Discount Rate, Percent Segment Reporting [Table] Segment Reporting [Table] Loans, modified in period, amount Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Greater than $250 Time Deposits, at or Above FDIC Insurance Limit Schedule of Lease Commitments Lease, Cost [Table Text Block] FirstSun Capital Bancorp 2021 Equity Incentive Plan FirstSun Capital Bancorp 2021 Equity Incentive Plan [Member] FirstSun Capital Bancorp 2021 Equity Incentive Plan [Member] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Provision for credit losses (Benefit) provision for credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Derivative [Line Items] Derivative [Line Items] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Exchange ratio (in shares) Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Servicing fees Contractually Specified Servicing Fees, Amount Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Tax exempt Interest And Fee Income Loans And Leases, Tax Exempt Interest And Fee Income Loans And Leases, Tax Exempt Weighted-Average Exercise Price, per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fixed rate term advance Federal Home Loan Bank Advances, Fixed Rate [Member] Federal Home Loan Bank Advances, Fixed Rate Measure: Measure [Axis] Amortization of debt premium Amortization of Debt Discount (Premium) Interest-bearing deposit accounts: Interest-Bearing Deposit Liabilities [Abstract] Equity Components [Axis] Equity Components [Axis] Effect of dilutive securities Earnings Per Share, Diluted, Other Disclosure [Abstract] Cash paid for income taxes, net 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Well-Capitalized under Prompt Corrective Action Provisions, Ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Net interest income Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Document Type Document Type Due after 10 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Cash paid to acquire FEIF Capital Partners, LLC Payments to Acquire Businesses, Net of Cash Acquired Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Other Other Unallocated Financing Receivables [Member] Late and ancillary fees Late And Ancillary Fee Income Generated By Servicing Financial Assets, Amount Late And Ancillary Fee Income Generated By Servicing Financial Assets, Amount Tier 1 leverage capital to average assets, Actual Ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Impairment of other intangible assets Intangible Asset, Excluding Goodwill, Impairment Loss Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Other noninterest expenses Other Noninterest Expense, Including Amortization Of Intangible Assets Other Noninterest Expense, Including Amortization Of Intangible Assets Changes in operating assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Allowance for credit losses Debt Securities, Allowance For Credit Losses Debt Securities, Allowance For Credit Losses Pledged Status [Domain] Pledged Status [Domain] (Loss) income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Thereafter Intangible Asset, Finite-Lived, Estimated Amortization Expense, after Year Four Intangible Asset, Finite-Lived, Estimated Amortization Expense, after Year Four Commitments and contingencies (Note 16) Commitments and Contingencies Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Finite Lived Assets Intangible Asset, Finite-Lived [Roll Forward] Executive Category: Executive Category [Axis] Business Combination Business Combination [Policy Text Block] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Estimated Fair Value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Schedule of Aging of Loan Portfolio Financing Receivable, Past Due [Table Text Block] Loans Not Past Due Financial Asset, Not Past Due [Member] Prepaid expenses and other assets Prepaid Expense and Other Assets Non-owner occupied Non-owner occupied Non-Owner Occupied Loans [Member] Non-Owner Occupied Loans Credit Loss Status [Axis] Credit Loss Status [Axis] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Changes in fair value: Servicing Asset at Fair Value, Changes in Fair Value [Abstract] Servicing Asset at Fair Value, Changes in Fair Value Debt securities, carrying value Debt Securities Interest paid on borrowed funds Noncash Investing And Financing Activities, Interest Paid On Borrowed Funds Noncash Investing And Financing Activities, Interest Paid On Borrowed Funds Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Federal Home Loan Bank, Advances, Option [Axis] Federal Home Loan Bank, Advances, Option [Axis] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Amortization and impairment of intangible assets Amortization of intangible assets Amortization and Impairment of Intangible Assets Amortization and 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[Member] Net unrealized (loss) gain on securities available-for-sale Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Customer service costs Customer Service Costs Customer Service Costs Bank-owned life insurance Bank Owned Life Insurance Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Asset Pledged as Collateral without Right Asset Pledged as Collateral without Right [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Collateral Dependent Loans with Allowance, Related Allowance Financing Receivable, With Related Allowance, Related Allowance Financing Receivable, With Related Allowance, Related Allowance Year before current fiscal year, writeoffs Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Equity Awards Adjustments Equity Awards Adjustments [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Revolving Loans Converted to Term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Pass Pass [Member] Plan Name [Axis] Plan Name [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Schedule of Loans Held for Investment Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital 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Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Subordinated Notes Due July 1, 2030 Subordinated Notes Due February 1, 2032 [Member] Subordinated Notes Due February 1, 2032 Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Purchase price Business Combination, Consideration Transferred Loan hedge fair value Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Loan Hedge Fair Value Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Loan Hedge Fair Value Entity Filer Category Entity Filer Category Estimated Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Other Financial Institutions Other Financial Institutions [Member] Other Financial Institutions Federal National Mortgage Association Federal National Mortgage Association (FNMA) [Member] Fee income Gain (Loss) on Derivative Instruments, Net, Pretax Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Derivative financial instruments not designated as hedging instruments: Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Deposits: Deposits [Abstract] Schedule of Weighted-Average key Assumptions Used to Estimate Fair Value of Mortgage Servicing Rights Schedule Of Fair Value Assumptions, Servicing Assets [Table Text Block] Schedule Of Fair Value Assumptions, Servicing Assets Entity Address, Address Line Two Entity Address, Address Line Two Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Estimated Fair Value Derivative financial instruments - liabilities Derivative Liability Total revenues Business Combination, Pro Forma Information, Pro Forma Revenue Entity Address, Address Line One Entity Address, Address Line One Vested, restriction released (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value (Benefit) provision for income taxes (Benefit) provision for income taxes Income Tax Expense (Benefit) Premium/ (discount) Financing Receivable, Unamortized Purchase Premium (Discount) Adjustments to reconcile income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Loan charge-offs Total Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff FirstSun Capital Bancorp 2017 And 2021 Equity Incentive Plan FirstSun Capital Bancorp 2017 And 2021 Equity Incentive Plan [Member] FirstSun Capital Bancorp 2017 And 2021 Equity Incentive Plan Thereafter Time Deposit Maturities, after Year Four Time Deposit Maturities, after Year Four Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Statement [Table] Statement [Table] Second Anniversaries Share-Based Payment Arrangement, Tranche Two [Member] Tier 1 risk-based capital to risk-weighted assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Fed Funds target rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Loans held-for-sale Loan, Held-for-Sale, Fair Value Disclosure Prepaid expenses and other assets Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current Derivative Instruments and Hedging Activities Disclosure [Abstract]