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Disclosure - Award Timing Disclosure Sheet http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure Award Timing Disclosure Notes 9 false false R10.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 10 false false R11.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 11 false false R12.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 12 false false R13.htm 995551 - Disclosure - Note 1a - Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies Sheet http://www.connectonebank.com/20251231/role/statement-note-1a-nature-of-operations-basis-of-presentation-and-summary-of-significant-accounting-policies Note 1a - 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Disclosure - Note 6 - Premises and Equipment Sheet http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment Note 6 - Premises and Equipment Notes 18 false false R19.htm 995557 - Disclosure - Note 7 - Goodwill and Other Intangible Assets Sheet http://www.connectonebank.com/20251231/role/statement-note-7-goodwill-and-other-intangible-assets Note 7 - Goodwill and Other Intangible Assets Notes 19 false false R20.htm 995558 - Disclosure - Note 8 - Deposits Sheet http://www.connectonebank.com/20251231/role/statement-note-8-deposits Note 8 - Deposits Notes 20 false false R21.htm 995559 - Disclosure - Note 9 - FHLB Borrowings Sheet http://www.connectonebank.com/20251231/role/statement-note-9-fhlb-borrowings Note 9 - FHLB Borrowings Notes 21 false false R22.htm 995560 - Disclosure - Note 10 - Subordinated Debentures Sheet http://www.connectonebank.com/20251231/role/statement-note-10-subordinated-debentures Note 10 - Subordinated Debentures Notes 22 false false R23.htm 995561 - Disclosure - Note 11 - Income Taxes Sheet http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes Note 11 - Income Taxes Notes 23 false false R24.htm 995562 - Disclosure - Note 12 - Preferred Stock Sheet http://www.connectonebank.com/20251231/role/statement-note-12-preferred-stock Note 12 - Preferred Stock Notes 24 false false R25.htm 995563 - Disclosure - Note 13 - Commitments, Contingencies and Concentrations of Credit Risk Sheet http://www.connectonebank.com/20251231/role/statement-note-13-commitments-contingencies-and-concentrations-of-credit-risk Note 13 - Commitments, Contingencies and Concentrations of Credit Risk Notes 25 false false R26.htm 995564 - Disclosure - Note 14 - Transactions with Executive Officers, Directors and Principle Stockholders Sheet http://www.connectonebank.com/20251231/role/statement-note-14-transactions-with-executive-officers-directors-and-principle-stockholders Note 14 - Transactions with Executive Officers, Directors and Principle Stockholders Notes 26 false false R27.htm 995565 - Disclosure - Note 15 - Stockholders' Equity and Regulatory Requirements Sheet http://www.connectonebank.com/20251231/role/statement-note-15-stockholders-equity-and-regulatory-requirements Note 15 - Stockholders' Equity and Regulatory Requirements Notes 27 false false R28.htm 995566 - Disclosure - Note 16 - Comprehensive Income Sheet http://www.connectonebank.com/20251231/role/statement-note-16-comprehensive-income Note 16 - Comprehensive Income Notes 28 false false R29.htm 995567 - Disclosure - Note 17 - Pension and Other Benefits Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits Note 17 - Pension and Other Benefits Notes 29 false false R30.htm 995568 - Disclosure - Note 18 - Stock Based Compensation Sheet http://www.connectonebank.com/20251231/role/statement-note-18-stock-based-compensation Note 18 - Stock Based Compensation Notes 30 false false R31.htm 995569 - Disclosure - Note 19 - Dividends and Other Restrictions Sheet http://www.connectonebank.com/20251231/role/statement-note-19-dividends-and-other-restrictions- Note 19 - Dividends and Other Restrictions Notes 31 false false R32.htm 995570 - Disclosure - Note 20 - Derivatives Sheet http://www.connectonebank.com/20251231/role/statement-note-20-derivatives Note 20 - Derivatives Notes 32 false false R33.htm 995571 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments Note 21 - Fair Value Measurements and Fair Value of Financial Instruments Notes 33 false false R34.htm 995572 - Disclosure - Note 22 - Parent Corporation Only Financial Statements Sheet http://www.connectonebank.com/20251231/role/statement-note-22-parent-corporation-only-financial-statements- Note 22 - Parent Corporation Only Financial Statements Notes 34 false false R35.htm 995573 - Disclosure - Note 23 - Quarterly Financial Information of ConnectOne Bancorp, Inc. (Unaudited) Sheet http://www.connectonebank.com/20251231/role/statement-note-23-quarterly-financial-information-of-connectone-bancorp-inc-unaudited Note 23 - Quarterly Financial Information of ConnectOne Bancorp, Inc. (Unaudited) Notes 35 false false R36.htm 995574 - Disclosure - Note 24 - Segment Information Sheet http://www.connectonebank.com/20251231/role/statement-note-24-segment-information Note 24 - Segment Information Notes 36 false false R37.htm 995578 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.connectonebank.com/20251231/role/statement-significant-accounting-policies-policies Significant Accounting Policies (Policies) Policies http://www.connectonebank.com/20251231/role/statement-note-1a-nature-of-operations-basis-of-presentation-and-summary-of-significant-accounting-policies 37 false false R38.htm 995579 - Disclosure - Note 2 - Business Combination (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-2-business-combination-tables Note 2 - Business Combination (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-2-business-combination 38 false false R39.htm 995580 - Disclosure - Note 3 - Earnings Per Common Share (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-3-earnings-per-common-share-tables Note 3 - Earnings Per Common Share (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-3-earnings-per-common-share 39 false false R40.htm 995581 - Disclosure - Note 4 - Investment Securities (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-4-investment-securities-tables Note 4 - Investment Securities (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-4-investment-securities 40 false false R41.htm 995582 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-tables Note 5 - Loans and the Allowance for Credit Losses (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses 41 false false R42.htm 995583 - Disclosure - Note 6 - Premises and Equipment (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment-tables Note 6 - Premises and Equipment (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment 42 false false R43.htm 995584 - Disclosure - Note 7 - Goodwill and Other Intangible Assets (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-7-goodwill-and-other-intangible-assets-tables Note 7 - Goodwill and Other Intangible Assets (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-7-goodwill-and-other-intangible-assets 43 false false R44.htm 995585 - Disclosure - Note 8 - Deposits (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-8-deposits-tables Note 8 - Deposits (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-8-deposits 44 false false R45.htm 995586 - Disclosure - Note 9 - FHLB Borrowings (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-9-fhlb-borrowings-tables Note 9 - FHLB Borrowings (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-9-fhlb-borrowings 45 false false R46.htm 995587 - Disclosure - Note 10 - Subordinated Debentures (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-10-subordinated-debentures-tables Note 10 - Subordinated Debentures (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-10-subordinated-debentures 46 false false R47.htm 995588 - Disclosure - Note 11 - Income Taxes (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes-tables Note 11 - Income Taxes (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes 47 false false R48.htm 995589 - Disclosure - Note 13 - Commitments, Contingencies and Concentrations of Credit Risk (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-13-commitments-contingencies-and-concentrations-of-credit-risk-tables Note 13 - Commitments, Contingencies and Concentrations of Credit Risk (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-13-commitments-contingencies-and-concentrations-of-credit-risk 48 false false R49.htm 995590 - Disclosure - Note 14 - Transactions with Executive Officers, Directors and Principle Stockholders (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-14-transactions-with-executive-officers-directors-and-principle-stockholders-tables Note 14 - Transactions with Executive Officers, Directors and Principle Stockholders (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-14-transactions-with-executive-officers-directors-and-principle-stockholders 49 false false R50.htm 995591 - Disclosure - Note 15 - Stockholders' Equity and Regulatory Requirements (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-15-stockholders-equity-and-regulatory-requirements-tables Note 15 - Stockholders' Equity and Regulatory Requirements (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-15-stockholders-equity-and-regulatory-requirements 50 false false R51.htm 995592 - Disclosure - Note 16 - Comprehensive Income (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-16-comprehensive-income-tables Note 16 - Comprehensive Income (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-16-comprehensive-income 51 false false R52.htm 995593 - Disclosure - Note 17 - Pension and Other Benefits (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-tables Note 17 - Pension and Other Benefits (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits 52 false false R53.htm 995594 - Disclosure - Note 18 - Stock Based Compensation (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-18-stock-based-compensation-tables Note 18 - Stock Based Compensation (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-18-stock-based-compensation 53 false false R54.htm 995595 - Disclosure - Note 20 - Derivatives (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-20-derivatives-tables Note 20 - Derivatives (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-20-derivatives 54 false false R55.htm 995596 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-tables Note 21 - Fair Value Measurements and Fair Value of Financial Instruments (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments 55 false false R56.htm 995597 - Disclosure - Note 22 - Parent Corporation Only Financial Statements (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-22-parent-corporation-only-financial-statements-tables Note 22 - Parent Corporation Only Financial Statements (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-22-parent-corporation-only-financial-statements- 56 false false R57.htm 995598 - Disclosure - Note 23 - Quarterly Financial Information of ConnectOne Bancorp, Inc. (Unaudited) (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-23-quarterly-financial-information-of-connectone-bancorp-inc-unaudited-tables Note 23 - Quarterly Financial Information of ConnectOne Bancorp, Inc. (Unaudited) (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-23-quarterly-financial-information-of-connectone-bancorp-inc-unaudited 57 false false R58.htm 995599 - Disclosure - Note 24 - Segment Information (Tables) Sheet http://www.connectonebank.com/20251231/role/statement-note-24-segment-information-tables Note 24 - Segment Information (Tables) Tables http://www.connectonebank.com/20251231/role/statement-note-24-segment-information 58 false false R59.htm 995600 - Disclosure - Note 1a - Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-1a-nature-of-operations-basis-of-presentation-and-summary-of-significant-accounting-policies-details-textual Note 1a - Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) Details 59 false false R60.htm 995601 - Disclosure - Note 2 - Business Combination (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-2-business-combination-details-textual Note 2 - Business Combination (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-2-business-combination-tables 60 false false R61.htm 995602 - Disclosure - Note 2 - Business Combination - Schedule of Purchase Price Consideration (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-2-business-combination-schedule-of-purchase-price-consideration-details Note 2 - Business Combination - Schedule of Purchase Price Consideration (Details) Details 61 false false R62.htm 995603 - Disclosure - Note 2 - Business Combination - Schedule of PCD Loans Acquired (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-2-business-combination-schedule-of-pcd-loans-acquired-details Note 2 - Business Combination - Schedule of PCD Loans Acquired (Details) Details 62 false false R63.htm 995604 - Disclosure - Note 2 - Business Combination - Pro Forma Information (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-2-business-combination-pro-forma-information-details Note 2 - Business Combination - Pro Forma Information (Details) Details 63 false false R64.htm 995605 - Disclosure - Note 3 - Earnings Per Common Share (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-3-earnings-per-common-share-details-textual Note 3 - Earnings Per Common Share (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-3-earnings-per-common-share-tables 64 false false R65.htm 995606 - Disclosure - Note 3 - Earnings Per Common Share - Computation of Earnings Per Common Share (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-3-earnings-per-common-share-computation-of-earnings-per-common-share-details Note 3 - Earnings Per Common Share - Computation of Earnings Per Common Share (Details) Details 65 false false R66.htm 995607 - Disclosure - Note 4 - Investment Securities (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-4-investment-securities-details-textual Note 4 - Investment Securities (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-4-investment-securities-tables 66 false false R67.htm 995608 - Disclosure - Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-4-investment-securities-portfolio-of-securities-availableforsale-details Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) Details 67 false false R68.htm 995609 - Disclosure - Note 4 - Investment Securities - Scheduled Maturities (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-4-investment-securities-scheduled-maturities-details Note 4 - Investment Securities - Scheduled Maturities (Details) Details 68 false false R69.htm 995610 - Disclosure - Note 4 - Investment Securities - Securities in an Unrealized Loss Position (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-4-investment-securities-securities-in-an-unrealized-loss-position-details Note 4 - Investment Securities - Securities in an Unrealized Loss Position (Details) Details 69 false false R70.htm 995611 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-details-textual Note 5 - Loans and the Allowance for Credit Losses (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-tables 70 false false R71.htm 995612 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Composition of Loan Portfolio (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-composition-of-loan-portfolio-details Note 5 - Loans and the Allowance for Credit Losses - Composition of Loan Portfolio (Details) Details 71 false false R72.htm 995613 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Composition of Loans Held-for-sale (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-composition-of-loans-heldforsale-details Note 5 - Loans and the Allowance for Credit Losses - Composition of Loans Held-for-sale (Details) Details 72 false false R73.htm 995614 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Loans Receivable on Nonaccrual Status (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-loans-receivable-on-nonaccrual-status-details Note 5 - Loans and the Allowance for Credit Losses - Loans Receivable on Nonaccrual Status (Details) Details 73 false false R74.htm 995615 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Loans by Origination and Risk Designation (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-loans-by-origination-and-risk-designation-details Note 5 - Loans and the Allowance for Credit Losses - Loans by Origination and Risk Designation (Details) Details 74 false false R75.htm 995616 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-collateral-dependent-loans-details Note 5 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) Details 75 false false R76.htm 995617 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-analysis-of-aging-of-loans-details Note 5 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) Details 76 false false R77.htm 995618 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-impairment-evaluation-on-loans-and-allowance-for-credit-losses-details Note 5 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) Details 77 false false R78.htm 995619 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Activity in the ACL for Loans (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-activity-in-the-acl-for-loans-details Note 5 - Loans and the Allowance for Credit Losses - Activity in the ACL for Loans (Details) Details 78 false false R79.htm 995620 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Amortized Cost of of the Modified Loans (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-amortized-cost-of-of-the-modified-loans-details Note 5 - Loans and the Allowance for Credit Losses - Amortized Cost of of the Modified Loans (Details) Details 79 false false R80.htm 995621 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Aging of Modified Loans (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-aging-of-modified-loans-details Note 5 - Loans and the Allowance for Credit Losses - Aging of Modified Loans (Details) Details 80 false false R81.htm 995622 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Rollforward of Allowance for Credit Losses for Unfunded Commitments (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-rollforward-of-allowance-for-credit-losses-for-unfunded-commitments-details Note 5 - Loans and the Allowance for Credit Losses - Rollforward of Allowance for Credit Losses for Unfunded Commitments (Details) Details 81 false false R82.htm 995623 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Summary of (Reversal of) Provision for Credit Losses (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-summary-of-reversal-of-provision-for-credit-losses-details Note 5 - Loans and the Allowance for Credit Losses - Summary of (Reversal of) Provision for Credit Losses (Details) Details 82 false false R83.htm 995624 - Disclosure - Note 6 - Premises and Equipment (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment-details-textual Note 6 - Premises and Equipment (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment-tables 83 false false R84.htm 995625 - Disclosure - Note 6 - Premises and Equipment - Property, Plant and Equipment (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment-property-plant-and-equipment-details Note 6 - Premises and Equipment - Property, Plant and Equipment (Details) Details 84 false false R85.htm 995626 - Disclosure - Note 6 - Premises and Equipment - Schedule of Capital Lease in Premises and Equipment (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment-schedule-of-capital-lease-in-premises-and-equipment-details Note 6 - Premises and Equipment - Schedule of Capital Lease in Premises and Equipment (Details) Details 85 false false R86.htm 995627 - Disclosure - Note 6 - Premises and Equipment - Schedule of Future Minimum Lease Payments for Finance Leases (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment-schedule-of-future-minimum-lease-payments-for-finance-leases-details Note 6 - Premises and Equipment - Schedule of Future Minimum Lease Payments for Finance Leases (Details) Details 86 false false R87.htm 995628 - Disclosure - Note 6 - Premises and Equipment - Schedule of Future Minimum Lease Payments for Finance Leases (Details) (Parentheticals) Sheet http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment-schedule-of-future-minimum-lease-payments-for-finance-leases-details-parentheticals Note 6 - Premises and Equipment - Schedule of Future Minimum Lease Payments for Finance Leases (Details) (Parentheticals) Details 87 false false R88.htm 995629 - Disclosure - Note 6 - Premises and Equipment - Schedule of Future Minimum Rental Payments for Operating Leases (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-6-premises-and-equipment-schedule-of-future-minimum-rental-payments-for-operating-leases-details Note 6 - Premises and Equipment - Schedule of Future Minimum Rental Payments for Operating Leases (Details) Details 88 false false R89.htm 995630 - Disclosure - Note 7 - Goodwill and Other Intangible Assets (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-7-goodwill-and-other-intangible-assets-details-textual Note 7 - Goodwill and Other Intangible Assets (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-7-goodwill-and-other-intangible-assets-tables 89 false false R90.htm 995631 - Disclosure - Note 7 - Goodwill and Other Intangible Assets - Schedule of Change in Goodwill (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-7-goodwill-and-other-intangible-assets-schedule-of-change-in-goodwill-details Note 7 - Goodwill and Other Intangible Assets - Schedule of Change in Goodwill (Details) Details 90 false false R91.htm 995632 - Disclosure - Note 7 - Goodwill and Other Intangible Assets - Intangible Assets (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-7-goodwill-and-other-intangible-assets-intangible-assets-details Note 7 - Goodwill and Other Intangible Assets - Intangible Assets (Details) Details 91 false false R92.htm 995633 - Disclosure - Note 7 - Goodwill and Other Intangible Assets - Estimated Amortization Expense (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-7-goodwill-and-other-intangible-assets-estimated-amortization-expense-details Note 7 - Goodwill and Other Intangible Assets - Estimated Amortization Expense (Details) Details 92 false false R93.htm 995634 - Disclosure - Note 8 - Deposits (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-8-deposits-details-textual Note 8 - Deposits (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-8-deposits-tables 93 false false R94.htm 995635 - Disclosure - Note 8 - Deposits - Schedule of Time Deposits (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-8-deposits-schedule-of-time-deposits-details Note 8 - Deposits - Schedule of Time Deposits (Details) Details 94 false false R95.htm 995636 - Disclosure - Note 9 - FHLB Borrowings (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-9-fhlb-borrowings-details-textual Note 9 - FHLB Borrowings (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-9-fhlb-borrowings-tables 95 false false R96.htm 995637 - Disclosure - Note 9 - FHLB Borrowings - FHLB Borrowings and Weighted Average Interest Rates (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-9-fhlb-borrowings-fhlb-borrowings-and-weighted-average-interest-rates-details Note 9 - FHLB Borrowings - FHLB Borrowings and Weighted Average Interest Rates (Details) Details 96 false false R97.htm 995638 - Disclosure - Note 10 - Subordinated Debentures (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-10-subordinated-debentures-details-textual Note 10 - Subordinated Debentures (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-10-subordinated-debentures-tables 97 false false R98.htm 995639 - Disclosure - Note 10 - Subordinated Debentures - Summary of Mandatory Redeemable Trust Preferred Securities (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-10-subordinated-debentures-summary-of-mandatory-redeemable-trust-preferred-securities-details Note 10 - Subordinated Debentures - Summary of Mandatory Redeemable Trust Preferred Securities (Details) Details 98 false false R99.htm 995640 - Disclosure - Note 11 - Income Taxes (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes-details-textual Note 11 - Income Taxes (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes-tables 99 false false R100.htm 995641 - Disclosure - Note 11 - Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes-schedule-of-components-of-income-tax-expense-benefit-details Note 11 - Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) Details 100 false false R101.htm 995642 - Disclosure - Note 11 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes-schedule-of-effective-income-tax-rate-reconciliation-details Note 11 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Details 101 false false R102.htm 995643 - Disclosure - Note 11 - Income Taxes - Income Taxes Paid (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes-income-taxes-paid-details Note 11 - Income Taxes - Income Taxes Paid (Details) Details 102 false false R103.htm 995644 - Disclosure - Note 11 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-11-income-taxes-schedule-of-deferred-tax-assets-and-liabilities-details Note 11 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) Details 103 false false R104.htm 995645 - Disclosure - Note 12 - Preferred Stock (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-12-preferred-stock-details-textual Note 12 - Preferred Stock (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-12-preferred-stock 104 false false R105.htm 995646 - Disclosure - Note 13 - Commitments, Contingencies and Concentrations of Credit Risk - Summary of Off-balance Sheet Risk (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-13-commitments-contingencies-and-concentrations-of-credit-risk-summary-of-offbalance-sheet-risk-details Note 13 - Commitments, Contingencies and Concentrations of Credit Risk - Summary of Off-balance Sheet Risk (Details) Details 105 false false R106.htm 995647 - Disclosure - Note 14 - Transactions with Executive Officers, Directors and Principle Stockholders (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-14-transactions-with-executive-officers-directors-and-principle-stockholders-details-textual Note 14 - Transactions with Executive Officers, Directors and Principle Stockholders (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-14-transactions-with-executive-officers-directors-and-principle-stockholders-tables 106 false false R107.htm 995648 - Disclosure - Note 14 - Transactions with Executive Officers, Directors and Principle Stockholders - Schedule of Related Party Transactions (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-14-transactions-with-executive-officers-directors-and-principle-stockholders-schedule-of-related-party-transactions-details Note 14 - Transactions with Executive Officers, Directors and Principle Stockholders - Schedule of Related Party Transactions (Details) Details 107 false false R108.htm 995649 - Disclosure - Note 15 - Stockholders' Equity and Regulatory Requirements (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-15-stockholders-equity-and-regulatory-requirements-details-textual Note 15 - Stockholders' Equity and Regulatory Requirements (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-15-stockholders-equity-and-regulatory-requirements-tables 108 false false R109.htm 995650 - Disclosure - Note 15 - Stockholders' Equity and Regulatory Requirements - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-15-stockholders-equity-and-regulatory-requirements-schedule-of-compliance-with-regulatory-capital-requirements-under-banking-regulations-details Note 15 - Stockholders' Equity and Regulatory Requirements - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) Details 109 false false R110.htm 995651 - Disclosure - Note 16 - Comprehensive Income - Reclassification out of Accumulated Other Comprehensive (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-16-comprehensive-income-reclassification-out-of-accumulated-other-comprehensive-details Note 16 - Comprehensive Income - Reclassification out of Accumulated Other Comprehensive (Details) Details 110 false false R111.htm 995652 - Disclosure - Note 16 - Comprehensive Income - Accumulated Other Comprehensive (Loss) Income (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-16-comprehensive-income-accumulated-other-comprehensive-loss-income-details Note 16 - Comprehensive Income - Accumulated Other Comprehensive (Loss) Income (Details) Details 111 false false R112.htm 995653 - Disclosure - Note 17 - Pension and Other Benefits (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-details-textual Note 17 - Pension and Other Benefits (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-tables 112 false false R113.htm 995654 - Disclosure - Note 17 - Pension and Other Benefits - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-schedule-of-benefit-obligations-in-excess-of-fair-value-of-plan-assets-details Note 17 - Pension and Other Benefits - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details) Details 113 false false R114.htm 995655 - Disclosure - Note 17 - Pension and Other Benefits - Schedule of Allocation of Plan Assets (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-schedule-of-allocation-of-plan-assets-details Note 17 - Pension and Other Benefits - Schedule of Allocation of Plan Assets (Details) Details 114 false false R115.htm 995656 - Disclosure - Note 17 - Pension and Other Benefits - Schedule of Changes in Projected Benefit Obligations (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-schedule-of-changes-in-projected-benefit-obligations-details Note 17 - Pension and Other Benefits - Schedule of Changes in Projected Benefit Obligations (Details) Details 115 false false R116.htm 995657 - Disclosure - Note 17 - Pension and Other Benefits - Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-schedule-of-amounts-in-accumulated-other-comprehensive-income-loss-to-be-recognized-details Note 17 - Pension and Other Benefits - Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized (Details) Details 116 false false R117.htm 995658 - Disclosure - Note 17 - Pension and Other Benefits - Schedule of Net Benefit Costs (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-schedule-of-net-benefit-costs-details Note 17 - Pension and Other Benefits - Schedule of Net Benefit Costs (Details) Details 117 false false R118.htm 995659 - Disclosure - Note 17 - Pension and Other Benefits - Schedule of Changes in Fair Value of Plan Assets (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-schedule-of-changes-in-fair-value-of-plan-assets-details Note 17 - Pension and Other Benefits - Schedule of Changes in Fair Value of Plan Assets (Details) Details 118 false false R119.htm 995660 - Disclosure - Note 17 - Pension and Other Benefits - Schedule of Defined Benefit Plans Disclosures (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-17-pension-and-other-benefits-schedule-of-defined-benefit-plans-disclosures-details Note 17 - Pension and Other Benefits - Schedule of Defined Benefit Plans Disclosures (Details) Details 119 false false R120.htm 995661 - Disclosure - Note 18 - Stock Based Compensation (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-18-stock-based-compensation-details-textual Note 18 - Stock Based Compensation (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-18-stock-based-compensation-tables 120 false false R121.htm 995662 - Disclosure - Note 18 - Stock Based Compensation - Activity in Restricted Shares (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-18-stock-based-compensation-activity-in-restricted-shares-details Note 18 - Stock Based Compensation - Activity in Restricted Shares (Details) Details 121 false false R122.htm 995663 - Disclosure - Note 18 - Stock Based Compensation - Summary of Unearned Performance Unit Awards (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-18-stock-based-compensation-summary-of-unearned-performance-unit-awards-details Note 18 - Stock Based Compensation - Summary of Unearned Performance Unit Awards (Details) Details 122 false false R123.htm 995664 - Disclosure - Note 18 - Stock Based Compensation - Summary of Unearned Restricted Stock Units (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-18-stock-based-compensation-summary-of-unearned-restricted-stock-units-details Note 18 - Stock Based Compensation - Summary of Unearned Restricted Stock Units (Details) Details 123 false false R124.htm 995665 - Disclosure - Note 19 - Dividends and Other Restrictions (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-19-dividends-and-other-restrictions-details-textual Note 19 - Dividends and Other Restrictions (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-19-dividends-and-other-restrictions- 124 false false R125.htm 995666 - Disclosure - Note 20 - Derivatives (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-20-derivatives-details-textual Note 20 - Derivatives (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-20-derivatives-tables 125 false false R126.htm 995667 - Disclosure - Note 20 - Derivatives - Net Losses Recorded in Other Comprehensive Income (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-20-derivatives-net-losses-recorded-in-other-comprehensive-income-details Note 20 - Derivatives - Net Losses Recorded in Other Comprehensive Income (Details) Details 126 false false R127.htm 995668 - Disclosure - Note 20 - Derivatives - Cash Flow Hedges Included in Consolidated Statements of Condition (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-20-derivatives-cash-flow-hedges-included-in-consolidated-statements-of-condition-details Note 20 - Derivatives - Cash Flow Hedges Included in Consolidated Statements of Condition (Details) Details 127 false false R128.htm 995669 - Disclosure - Note 20 - Derivatives - Schedule of Non Hedging Derivatives (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-20-derivatives-schedule-of-non-hedging-derivatives-details Note 20 - Derivatives - Schedule of Non Hedging Derivatives (Details) Details 128 false false R129.htm 995670 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-details-textual Note 21 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) Details http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-tables 129 false false R130.htm 995671 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured on a Recurring Basis (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-assets-and-liabilities-measured-on-a-recurring-basis-details Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured on a Recurring Basis (Details) Details 130 false false R131.htm 995672 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-assets-measured-on-a-nonrecurring-basis-details Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details) Details 131 false false R132.htm 995673 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on Recurring Basis Using Significant Unobservable Inputs (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-assets-measured-on-recurring-basis-using-significant-unobservable-inputs-details Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on Recurring Basis Using Significant Unobservable Inputs (Details) Details 132 false false R133.htm 995674 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-quantitative-information-about-significant-unobservable-inputs-details Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Details) Details 133 false false R134.htm 995675 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Significant Unobservable Inputs for Assets Measured on Nonrecurring Basis (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-significant-unobservable-inputs-for-assets-measured-on-nonrecurring-basis-details Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Significant Unobservable Inputs for Assets Measured on Nonrecurring Basis (Details) Details 134 false false R135.htm 995676 - Disclosure - Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-21-fair-value-measurements-and-fair-value-of-financial-instruments-carrying-value-and-fair-value-of-financial-instruments-details Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) Details 135 false false R136.htm 995677 - Disclosure - Note 22 - Parent Corporation Only Financial Statements - Condensed Balance Sheet (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-22-parent-corporation-only-financial-statements-condensed-balance-sheet-details Note 22 - Parent Corporation Only Financial Statements - Condensed Balance Sheet (Details) Details 136 false false R137.htm 995678 - Disclosure - Note 22 - Parent Corporation Only Financial Statements - Condensed Income Statement (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-22-parent-corporation-only-financial-statements-condensed-income-statement-details Note 22 - Parent Corporation Only Financial Statements - Condensed Income Statement (Details) Details 137 false false R138.htm 995679 - Disclosure - Note 22 - Parent Corporation Only Financial Statements - Condensed Statements of Cash Flows (Details) Sheet http://www.connectonebank.com/20251231/role/statement-note-22-parent-corporation-only-financial-statements-condensed-statements-of-cash-flows-details Note 22 - Parent Corporation Only Financial Statements - Condensed Statements of Cash Flows (Details) Details 138 false false R139.htm 995680 - Disclosure - Note 23 - Quarterly Financial Information of ConnectOne Bancorp, Inc. 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