Entity tax identification number Entity Tax Identification Number Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Subsequent Event Subsequent Event [Member] Investment sold, excluding plan interest in master trust, selling price EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Participant contribution, pretax, maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Note receivable from participant, account, maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE EBP, Investment, Fair Value and NAV [Text Block] Note receivable from participant, account, minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Nonparticipant-Directed Investment [Abstract] Investments, at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Subsequent Event Type [Domain] Subsequent Event Type [Domain] Employer common stock Investments, percentage of ownership EBP, Risk And Uncertainty, Employer Common Stock Investments, Percentage Of Ownership EBP, Risk And Uncertainty, Employer Common Stock Investments, Percentage Of Ownership Level 1 Fair Value, Inputs, Level 1 [Member] Suspense account for excess pension funding, ratable use period EBP, Suspense Account For Excess Pension Funding, Ratable Use Period EBP, Suspense Account For Excess Pension Funding, Ratable Use Period EBP, Note Receivable From Participant, Primary Residence Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, Primary Residence Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, Primary Residence Loan, Maximum Borrowing Term EBP, Investment, Fair Value and NAV [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Net transfers to other investments EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Unfunded commitments EBP, Fair Value, Investment, NAV, Unfunded Commitment EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Amendment Flag Amendment Flag Basis of Presentation EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Investment, at fair value (in shares) EBP, Investment, Number of Shares EBP, Nonparticipant-Directed Investment [Line Items] EBP, Nonparticipant-Directed Investment [Line Items] EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] Requisite service period, hours of service EBP, Requisite Service Period, Hours Of Service EBP, Requisite Service Period, Hours Of Service Schedule of Fair Value EBP, Investment, Fair Value and NAV [Table Text Block] Percentage of plan investments able to be diversified EBP, Percentage Of Plan Investments Able To Be Diversified EBP, Percentage Of Plan Investments Able To Be Diversified Investments [Domain] Investments [Domain] EBP, Employer Contribution Matching Tranche [Axis] EBP, Employer Contribution Matching Tranche [Axis] EBP, Employer Contribution Matching Tranche Use of Estimates EBP, Use of Estimate [Policy Text Block] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] EBP, Schedule of Asset Held for Investment [Text Block] EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] EBP, Employer Contribution Matching Tranche One EBP, Employer Contribution Matching Tranche One [Member] EBP, Employer Contribution Matching Tranche One RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] Employer Change in net asset available for benefit, increase from employer contribution, cash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Minimum Minimum [Member] Note receivable from participant, interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Investment Type [Axis] Investment Type [Axis] Contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Employer contribution, noncontributory profit-sharing, percentage of compensation EBP, Employer Contribution, Noncontributory Profit-Sharing, Percentage Of Compensation EBP, Employer Contribution, Noncontributory Profit-Sharing, Percentage Of Compensation Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] DESCRIPTION OF PLAN EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Interest on loans EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] 2 EBP, Employer Contribution Vesting Percentage, 2 Years Of Vesting Services EBP, Employer Contribution Vesting Percentage, 2 Years Of Vesting Services Registered investment companies Registered Investment Companies [Member] Registered Investment Companies Zions Bancorporation, N.A. common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP 006 EBP 006 [Member] EBP 006 EBP, Nonparticipant-Directed Investment [Table] EBP, Nonparticipant-Directed Investment [Table] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Note receivable from participant, allowance for credit loss EBP, Note Receivable from Participant, Allowance for Credit Loss Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Change in net asset available for benefit, decrease from administrative expense EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Concentration of Investments EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] 4 EBP, Employer Contribution Vesting Percentage, 4 Years Of Vesting Services EBP, Employer Contribution Vesting Percentage, 4 Years Of Vesting Services EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Employer contribution participant compensation matched percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] EBP, Employer Contribution Matching Tranche Two EBP, Employer Contribution Matching Tranche Two [Member] EBP, Employer Contribution Matching Tranche Two EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase Net Increase in Bank common stock EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Minimum period of employment, earlier eligibility for "safe harbor" matching contributions EBP, Minimum Period Of Employment, Earlier Eligibility For Safe Harbor Matching Contributions EBP, Minimum Period Of Employment, Earlier Eligibility For Safe Harbor Matching Contributions TRANSACTIONS WITH PARTIES-IN-INTEREST EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Receivable EBP, Receivable Recently Issued Accounting Pronouncements EBP, Recently Issued Accounting Pronouncements [Policy Text Block] EBP, Recently Issued Accounting Pronouncements Dividends EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Benefits paid directly to participants Benefits paid directly to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Investments, current value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] Notes receivable from participants EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Participation period before plan investments able to be diversified EBP, Participation Period Before Plan Investments Able To Be Diversified EBP, Participation Period Before Plan Investments Able To Be Diversified Investment Valuation, Income Recognition and Benefit Payments EBP, Investment [Policy Text Block] Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type Party-in-Interest EBP, Other Related Party and Party-in-Interest [Member] Minimum age to be eligible to participate EBP, Minimum Age To Be Eligible To Participate EBP, Minimum Age To Be Eligible To Participate Entity Central Index Key Entity Central Index Key Requisite service period EBP, Requisite Service Period EBP, Requisite Service Period EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Common collective trusts Common Collective Trust [Member] Net assets available for benefits: EBP, Net Asset Available for Benefit [Abstract] Investment acquired, excluding plan interest in master trust, cost, exchanges made by other participants EBP, Investment Acquired, Excluding Plan Interest In Master Trust, Cost, Exchanges Made By Other Participants EBP, Investment Acquired, Excluding Plan Interest In Master Trust, Cost, Exchanges Made By Other Participants EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Risk and Uncertainty [Abstract] Percent vested at normal retirement age EBP, Percent Vested At Normal Retirement Age EBP, Percent Vested At Normal Retirement Age Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant 3 EBP, Employer Contribution Vesting Percentage, 3 Years Of Vesting Services EBP, Employer Contribution Vesting Percentage, 3 Years Of Vesting Services Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Vesting Schedule EBP, Vesting Schedule [Table Text Block] EBP, Vesting Schedule SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Years of vesting service Vesting Schedule By Years Of Service [Abstract] Vesting Schedule By Years Of Service INVESTMENTS EBP, Investment [Text Block] EBP, Investment Investment acquired, excluding plan interest in master trust, cost EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Investments, cost of assets EBP, Investment, Excluding Plan Interest in Master Trust, Cost Subsequent Events EBP, Subsequent Event [Policy Text Block] INCOME TAX STATUS EBP, Tax Status [Text Block] Note receivable from participant, account, maximum borrowing, to total account, Pprcentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Document Information [Table] Document Information [Table] 5 or more EBP, Employer Contribution Vesting Percentage, 5 Or More Years Of Vesting Services EBP, Employer Contribution Vesting Percentage, 5 Or More Years Of Vesting Services Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] EBP, Employer Contribution Matching Tranche [Domain] EBP, Employer Contribution Matching Tranche [Domain] EBP, Employer Contribution Matching Tranche [Domain] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] Less than 2 EBP, Employer Contribution Vesting Percentage, Less Than 2 Years Of Vesting Services EBP, Employer Contribution Vesting Percentage, Less Than 2 Years Of Vesting Services Net assets available for benefits Beginning of year End of year Net assets available for benefits EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Employer contribution matching percentage EBP, Employer Contribution, Matching Percentage Investments that use NAV Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Participant and employer contributions EBP, Employer And Participant Contributions, Receivable EBP, Employer And Participant Contributions, Receivable EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] Schedule of Investments EBP, Investment [Table Text Block] EBP, Investment