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Disclosure - Note 1a - Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies Sheet http://www.connectonebank.com/20231231/role/statement-note-1a-nature-of-operations-basis-of-presentation-and-summary-of-significant-accounting-policies Note 1a - Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies Notes 9 false false R10.htm 009 - Disclosure - Note 2 - Earnings Per Common Share Sheet http://www.connectonebank.com/20231231/role/statement-note-2-earnings-per-common-share Note 2 - Earnings Per Common Share Notes 10 false false R11.htm 010 - Disclosure - Note 3 - Investment Securities Sheet http://www.connectonebank.com/20231231/role/statement-note-3-investment-securities Note 3 - Investment Securities Notes 11 false false R12.htm 011 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses Note 4 - Loans and the Allowance for Credit Losses Notes 12 false false R13.htm 012 - 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Note 10 - Income Taxes Sheet http://www.connectonebank.com/20231231/role/statement-note-10-income-taxes Note 10 - Income Taxes Notes 18 false false R19.htm 018 - Disclosure - Note 11 - Preferred Stock Sheet http://www.connectonebank.com/20231231/role/statement-note-11-preferred-stock Note 11 - Preferred Stock Notes 19 false false R20.htm 019 - Disclosure - Note 12 - Commitments, Contingencies, and Concentrations of Credit Risk Sheet http://www.connectonebank.com/20231231/role/statement-note-12-commitments-contingencies-and-concentrations-of-credit-risk Note 12 - Commitments, Contingencies, and Concentrations of Credit Risk Notes 20 false false R21.htm 020 - Disclosure - Note 13 - Transactions with Executive Officers, Directors, and Principle Stockholders Sheet http://www.connectonebank.com/20231231/role/statement-note-13-transactions-with-executive-officers-directors-and-principle-stockholders Note 13 - Transactions with Executive Officers, Directors, and Principle Stockholders Notes 21 false false R22.htm 021 - Disclosure - Note 14 - Stockholders' Equity and Regulatory Requirements Sheet http://www.connectonebank.com/20231231/role/statement-note-14-stockholders-equity-and-regulatory-requirements Note 14 - Stockholders' Equity and Regulatory Requirements Notes 22 false false R23.htm 022 - Disclosure - Note 15 - Comprehensive Income Sheet http://www.connectonebank.com/20231231/role/statement-note-15-comprehensive-income Note 15 - Comprehensive Income Notes 23 false false R24.htm 023 - Disclosure - Note 16 - Pension and Other Benefits Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits Note 16 - Pension and Other Benefits Notes 24 false false R25.htm 024 - Disclosure - Note 17 - Stock Based Compensation Sheet http://www.connectonebank.com/20231231/role/statement-note-17-stock-based-compensation Note 17 - Stock Based Compensation Notes 25 false false R26.htm 025 - Disclosure - Note 18 - Dividends and Other Restrictions Sheet http://www.connectonebank.com/20231231/role/statement-note-18-dividends-and-other-restrictions- Note 18 - 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(Unaudited) Sheet http://www.connectonebank.com/20231231/role/statement-note-22-quarterly-financial-information-of-connectone-bancorp-inc-unaudited Note 22 - Quarterly Financial Information of ConnectOne Bancorp, Inc. 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Investment Securities (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-3-investment-securities 34 false false R35.htm 995479 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-tables Note 4 - Loans and the Allowance for Credit Losses (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses 35 false false R36.htm 995480 - Disclosure - Note 5 - Premises and Equipment (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-5-premises-and-equipment-tables Note 5 - Premises and Equipment (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-5-premises-and-equipment 36 false false R37.htm 995481 - Disclosure - Note 6 - Goodwill and Other Intangible Assets (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-6-goodwill-and-other-intangible-assets-tables Note 6 - Goodwill and Other Intangible Assets (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-6-goodwill-and-other-intangible-assets 37 false false R38.htm 995482 - Disclosure - Note 7 - Deposits (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-7-deposits-tables Note 7 - Deposits (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-7-deposits 38 false false R39.htm 995483 - Disclosure - Note 8 - FHLB Borrowings (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-8-fhlb-borrowings-tables Note 8 - FHLB Borrowings (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-8-fhlb-borrowings 39 false false R40.htm 995484 - Disclosure - Note 9 - Subordinated Debentures (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-9-subordinated-debentures-tables Note 9 - Subordinated Debentures (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-9-subordinated-debentures 40 false false R41.htm 995485 - Disclosure - Note 10 - Income Taxes (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-10-income-taxes-tables Note 10 - Income Taxes (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-10-income-taxes 41 false false R42.htm 995486 - Disclosure - Note 12 - Commitments, Contingencies, and Concentrations of Credit Risk (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-12-commitments-contingencies-and-concentrations-of-credit-risk-tables Note 12 - Commitments, Contingencies, and Concentrations of Credit Risk (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-12-commitments-contingencies-and-concentrations-of-credit-risk 42 false false R43.htm 995487 - Disclosure - Note 13 - Transactions with Executive Officers, Directors, and Principle Stockholders (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-13-transactions-with-executive-officers-directors-and-principle-stockholders-tables Note 13 - Transactions with Executive Officers, Directors, and Principle Stockholders (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-13-transactions-with-executive-officers-directors-and-principle-stockholders 43 false false R44.htm 995488 - Disclosure - Note 14 - Stockholders' Equity and Regulatory Requirements (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-14-stockholders-equity-and-regulatory-requirements-tables Note 14 - Stockholders' Equity and Regulatory Requirements (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-14-stockholders-equity-and-regulatory-requirements 44 false false R45.htm 995489 - Disclosure - Note 15 - Comprehensive Income (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-15-comprehensive-income-tables Note 15 - Comprehensive Income (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-15-comprehensive-income 45 false false R46.htm 995490 - Disclosure - Note 16 - Pension and Other Benefits (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-tables Note 16 - Pension and Other Benefits (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits 46 false false R47.htm 995491 - Disclosure - Note 17 - Stock Based Compensation (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-17-stock-based-compensation-tables Note 17 - Stock Based Compensation (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-17-stock-based-compensation 47 false false R48.htm 995492 - Disclosure - Note 19 - Derivatives (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-19-derivatives-tables Note 19 - Derivatives (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-19-derivatives 48 false false R49.htm 995493 - Disclosure - Note 20 - Fair Value Measurements and Fair Value of Financial Instruments (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-20-fair-value-measurements-and-fair-value-of-financial-instruments-tables Note 20 - Fair Value Measurements and Fair Value of Financial Instruments (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-20-fair-value-measurements-and-fair-value-of-financial-instruments 49 false false R50.htm 995494 - Disclosure - Note 21 - Parent Corporation Only Financial Statements (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-21-parent-corporation-only-financial-statements-tables Note 21 - Parent Corporation Only Financial Statements (Tables) Tables http://www.connectonebank.com/20231231/role/statement-note-21-parent-corporation-only-financial-statements- 50 false false R51.htm 995495 - Disclosure - Note 22 - Quarterly Financial Information of ConnectOne Bancorp, Inc. (Unaudited) (Tables) Sheet http://www.connectonebank.com/20231231/role/statement-note-22-quarterly-financial-information-of-connectone-bancorp-inc-unaudited-tables Note 22 - Quarterly Financial Information of ConnectOne Bancorp, Inc. 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Disclosure - Note 3 - Investment Securities (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-3-investment-securities-details-textual Note 3 - Investment Securities (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-3-investment-securities-tables 54 false false R55.htm 995499 - Disclosure - Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-3-investment-securities-portfolio-of-securities-availableforsale-details Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) Details 55 false false R56.htm 995500 - Disclosure - Note 3 - Investment Securities - Scheduled Maturities (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-3-investment-securities-scheduled-maturities-details Note 3 - Investment Securities - Scheduled Maturities (Details) Details 56 false false R57.htm 995501 - Disclosure - Note 3 - Investment Securities - Gross Gains and Losses from Sales and Redemptions of Securities (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-3-investment-securities-gross-gains-and-losses-from-sales-and-redemptions-of-securities-details Note 3 - Investment Securities - Gross Gains and Losses from Sales and Redemptions of Securities (Details) Details 57 false false R58.htm 995502 - Disclosure - Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-3-investment-securities-securities-in-an-unrealized-loss-position-details Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) Details 58 false false R59.htm 995503 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-details-textual Note 4 - Loans and the Allowance for Credit Losses (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-tables 59 false false R60.htm 995504 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Composition of Loan Portfolio (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-composition-of-loan-portfolio-details Note 4 - Loans and the Allowance for Credit Losses - Composition of Loan Portfolio (Details) Details 60 false false R61.htm 995505 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Composition of Loans Held-for-sale (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-composition-of-loans-heldforsale-details Note 4 - Loans and the Allowance for Credit Losses - Composition of Loans Held-for-sale (Details) Details 61 false false R62.htm 995506 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Loans Receivable on Nonaccrual Status (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-loans-receivable-on-nonaccrual-status-details Note 4 - Loans and the Allowance for Credit Losses - Loans Receivable on Nonaccrual Status (Details) Details 62 false false R63.htm 995507 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Loans by Origination and Risk Designation (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-loans-by-origination-and-risk-designation-details Note 4 - Loans and the Allowance for Credit Losses - Loans by Origination and Risk Designation (Details) Details 63 false false R64.htm 995508 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-collateral-dependent-loans-details Note 4 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) Details 64 false false R65.htm 995509 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-analysis-of-aging-of-loans-details Note 4 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) Details 65 false false R66.htm 995510 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-impairment-evaluation-on-loans-and-allowance-for-credit-losses-details Note 4 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) Details 66 false false R67.htm 995511 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Activity in the ACL for Loans (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-activity-in-the-acl-for-loans-details Note 4 - Loans and the Allowance for Credit Losses - Activity in the ACL for Loans (Details) Details 67 false false R68.htm 995512 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Amortized Cost of of the Modified Loans (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-amortized-cost-of-of-the-modified-loans-details Note 4 - Loans and the Allowance for Credit Losses - Amortized Cost of of the Modified Loans (Details) Details 68 false false R69.htm 995513 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Aging of Modified Loans (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-aging-of-modified-loans-details Note 4 - Loans and the Allowance for Credit Losses - Aging of Modified Loans (Details) Details 69 false false R70.htm 995514 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Rollforward of Allowance for Credit Losses for Unfunded Commitments (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-rollforward-of-allowance-for-credit-losses-for-unfunded-commitments-details Note 4 - Loans and the Allowance for Credit Losses - Rollforward of Allowance for Credit Losses for Unfunded Commitments (Details) Details 70 false false R71.htm 995515 - Disclosure - Note 4 - Loans and the Allowance for Credit Losses - Summary of (Reversal of) Provision for Credit Losses (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-4-loans-and-the-allowance-for-credit-losses-summary-of-reversal-of-provision-for-credit-losses-details Note 4 - Loans and the Allowance for Credit Losses - Summary of (Reversal of) Provision for Credit Losses (Details) Details 71 false false R72.htm 995516 - Disclosure - Note 5 - Premises and Equipment (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-5-premises-and-equipment-details-textual Note 5 - Premises and Equipment (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-5-premises-and-equipment-tables 72 false false R73.htm 995517 - Disclosure - Note 5 - Premises and Equipment - Property, Plant and Equipment (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-5-premises-and-equipment-property-plant-and-equipment-details Note 5 - Premises and Equipment - Property, Plant and Equipment (Details) Details 73 false false R74.htm 995518 - Disclosure - Note 5 - Premises and Equipment - Schedule of Capital Lease in Premises and Equipment (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-5-premises-and-equipment-schedule-of-capital-lease-in-premises-and-equipment-details Note 5 - Premises and Equipment - Schedule of Capital Lease in Premises and Equipment (Details) Details 74 false false R75.htm 995519 - Disclosure - Note 5 - Premises and Equipment - Schedule of Future Minimum Lease Payments for Finance Leases (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-5-premises-and-equipment-schedule-of-future-minimum-lease-payments-for-finance-leases-details Note 5 - Premises and Equipment - Schedule of Future Minimum Lease Payments for Finance Leases (Details) Details 75 false false R76.htm 995520 - Disclosure - Note 5 - Premises and Equipment - Schedule of Future Minimum Rental Payments for Operating Leases (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-5-premises-and-equipment-schedule-of-future-minimum-rental-payments-for-operating-leases-details Note 5 - Premises and Equipment - Schedule of Future Minimum Rental Payments for Operating Leases (Details) Details 76 false false R77.htm 995521 - Disclosure - Note 6 - Goodwill and Other Intangible Assets (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-6-goodwill-and-other-intangible-assets-details-textual Note 6 - Goodwill and Other Intangible Assets (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-6-goodwill-and-other-intangible-assets-tables 77 false false R78.htm 995522 - Disclosure - Note 6 - Goodwill and Other Intangible Assets - Schedule of Change in Goodwill (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-6-goodwill-and-other-intangible-assets-schedule-of-change-in-goodwill-details Note 6 - Goodwill and Other Intangible Assets - Schedule of Change in Goodwill (Details) Details 78 false false R79.htm 995523 - Disclosure - Note 6 - Goodwill and Other Intangible Assets - Intangible Assets (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-6-goodwill-and-other-intangible-assets-intangible-assets-details Note 6 - Goodwill and Other Intangible Assets - Intangible Assets (Details) Details 79 false false R80.htm 995524 - Disclosure - Note 6 - Goodwill and Other Intangible Assets - Estimated Amortization Expense (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-6-goodwill-and-other-intangible-assets-estimated-amortization-expense-details Note 6 - 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Disclosure - Note 8 - FHLB Borrowings - FHLB Borrowings and Weighted Average Interest Rates (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-8-fhlb-borrowings-fhlb-borrowings-and-weighted-average-interest-rates-details Note 8 - FHLB Borrowings - FHLB Borrowings and Weighted Average Interest Rates (Details) Details 84 false false R85.htm 995529 - Disclosure - Note 9 - Subordinated Debentures (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-9-subordinated-debentures-details-textual Note 9 - Subordinated Debentures (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-9-subordinated-debentures-tables 85 false false R86.htm 995530 - Disclosure - Note 9 - Subordinated Debentures - Summary of Mandatory Redeemable Trust Preferred Securities (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-9-subordinated-debentures-summary-of-mandatory-redeemable-trust-preferred-securities-details Note 9 - Subordinated Debentures - Summary of Mandatory Redeemable Trust Preferred Securities (Details) Details 86 false false R87.htm 995531 - Disclosure - Note 10 - Income Taxes (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-10-income-taxes-details-textual Note 10 - Income Taxes (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-10-income-taxes-tables 87 false false R88.htm 995532 - Disclosure - Note 10 - Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-10-income-taxes-schedule-of-components-of-income-tax-expense-benefit-details Note 10 - Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) Details 88 false false R89.htm 995533 - Disclosure - Note 10 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-10-income-taxes-schedule-of-effective-income-tax-rate-reconciliation-details Note 10 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Details 89 false false R90.htm 995534 - Disclosure - Note 10 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-10-income-taxes-schedule-of-deferred-tax-assets-and-liabilities-details Note 10 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) Details 90 false false R91.htm 995535 - Disclosure - Note 11 - Preferred Stock (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-11-preferred-stock-details-textual Note 11 - Preferred Stock (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-11-preferred-stock 91 false false R92.htm 995536 - Disclosure - Note 12 - Commitments, Contingencies and Concentrations of Credit Risk - Summary of Off-balance Sheet Risk (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-12-commitments-contingencies-and-concentrations-of-credit-risk-summary-of-offbalance-sheet-risk-details Note 12 - 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Transactions with Executive Officers, Directors, and Principle Stockholders - Schedule of Related Party Transactions (Details) Details 94 false false R95.htm 995539 - Disclosure - Note 14 - Stockholders' Equity and Regulatory Requirements (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-14-stockholders-equity-and-regulatory-requirements-details-textual Note 14 - Stockholders' Equity and Regulatory Requirements (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-14-stockholders-equity-and-regulatory-requirements-tables 95 false false R96.htm 995540 - Disclosure - Note 14 - Stockholders' Equity and Regulatory Requirements - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-14-stockholders-equity-and-regulatory-requirements-schedule-of-compliance-with-regulatory-capital-requirements-under-banking-regulations-details Note 14 - Stockholders' Equity and Regulatory Requirements - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) Details 96 false false R97.htm 995541 - Disclosure - Note 15 - Comprehensive Income - Reclassification out of Accumulated Other Comprehensive (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-15-comprehensive-income-reclassification-out-of-accumulated-other-comprehensive-details Note 15 - Comprehensive Income - Reclassification out of Accumulated Other Comprehensive (Details) Details 97 false false R98.htm 995542 - Disclosure - Note 15 - Comprehensive Income - Accumulated Other Comprehensive (Loss) (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-15-comprehensive-income-accumulated-other-comprehensive-loss-details Note 15 - Comprehensive Income - Accumulated Other Comprehensive (Loss) (Details) Details 98 false false R99.htm 995543 - Disclosure - Note 16 - Pension and Other Benefits (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-details-textual Note 16 - Pension and Other Benefits (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-tables 99 false false R100.htm 995544 - Disclosure - Note 16 - Pension and Other Benefits - Schedule of Changes in Projected Benefit Obligations (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-schedule-of-changes-in-projected-benefit-obligations-details Note 16 - Pension and Other Benefits - Schedule of Changes in Projected Benefit Obligations (Details) Details 100 false false R101.htm 995545 - Disclosure - Note 16 - Pension and Other Benefits - Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-schedule-of-amounts-in-accumulated-other-comprehensive-income-loss-to-be-recognized-details Note 16 - Pension and Other Benefits - Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized (Details) Details 101 false false R102.htm 995546 - Disclosure - Note 16 - Pension and Other Benefits - Schedule of Net Benefit Costs (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-schedule-of-net-benefit-costs-details Note 16 - Pension and Other Benefits - Schedule of Net Benefit Costs (Details) Details 102 false false R103.htm 995547 - Disclosure - Note 16 - Pension and Other Benefits - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-schedule-of-benefit-obligations-in-excess-of-fair-value-of-plan-assets-details Note 16 - Pension and Other Benefits - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details) Details 103 false false R104.htm 995548 - Disclosure - Note 16 - Pension and Other Benefits - Schedule of Allocation of Plan Assets (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-schedule-of-allocation-of-plan-assets-details Note 16 - Pension and Other Benefits - Schedule of Allocation of Plan Assets (Details) Details 104 false false R105.htm 995549 - Disclosure - Note 16 - Pension and Other Benefits - Schedule of Changes in Fair Value of Plan Assets (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-schedule-of-changes-in-fair-value-of-plan-assets-details Note 16 - Pension and Other Benefits - Schedule of Changes in Fair Value of Plan Assets (Details) Details 105 false false R106.htm 995550 - Disclosure - Note 16 - Pension and Other Benefits - Schedule of Defined Benefit Plans Disclosures (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-16-pension-and-other-benefits-schedule-of-defined-benefit-plans-disclosures-details Note 16 - Pension and Other Benefits - Schedule of Defined Benefit Plans Disclosures (Details) Details 106 false false R107.htm 995551 - Disclosure - Note 17 - Stock Based Compensation (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-17-stock-based-compensation-details-textual Note 17 - 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Stock Based Compensation - Summary of Unearned Performance Unit Awards (Details) Details 110 false false R111.htm 995555 - Disclosure - Note 17 - Stock Based Compensation - Summary of Unearned Restricted Stock Units (Details) Sheet http://www.connectonebank.com/20231231/role/statement-note-17-stock-based-compensation-summary-of-unearned-restricted-stock-units-details Note 17 - Stock Based Compensation - Summary of Unearned Restricted Stock Units (Details) Details 111 false false R112.htm 995556 - Disclosure - Note 18 - Dividends and Other Restrictions (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-18-dividends-and-other-restrictions-details-textual Note 18 - Dividends and Other Restrictions (Details Textual) Details http://www.connectonebank.com/20231231/role/statement-note-18-dividends-and-other-restrictions- 112 false false R113.htm 995557 - Disclosure - Note 19 - Derivatives (Details Textual) Sheet http://www.connectonebank.com/20231231/role/statement-note-19-derivatives-details-textual Note 19 - 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