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Schedule H, Line 4i - Schedule of Assets Held at End of Year (Details) - Bar Harbor Bankshares 401(k) Plan
12 Months Ended
Dec. 31, 2025
USD ($)
shares
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Entity tax identification number 01-0393663
Plan number 002
Participant loans $ 643,960
Total $ 73,580,926
Investment, Identifier [Axis]: Bar Harbor Bankshares, Company Stock  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:BarHarborBanksharesMember
Investment type Common Stock of BHB
Number of shares held | shares 139,616.446
Current Value $ 4,335,091
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Black Rock, Inflation Protection Bond  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:BlackRockMember
Investment type Mutual funds
Number of shares held | shares 2,230.73
Current Value $ 21,571
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Eaton Vance, Floating Rate  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:EatonVanceMember
Investment type Mutual funds
Number of shares held | shares 4,586.689
Current Value $ 37,106
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Fidelity , OTC Portfolio  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:FidelityMember
Investment type Mutual funds
Number of shares held | shares 52,453.142
Current Value $ 1,273,562
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Goldman Sachs, GQG Partners International Opportunities  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:GoldmanSachsMember
Investment type Mutual funds
Number of shares held | shares 23,916.18
Current Value $ 537,157
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Lord Abbett, Short Duration Income  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:LordAbbettMember
Investment type Mutual funds
Number of shares held | shares 160,688.628
Current Value $ 625,079
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Morgan Stanley, Institutional Fund Inc.  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name Morgan Stanley
Investment type Mutual funds
Number of shares held | shares 3,585.094
Current Value $ 250,741
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: PIMCO, Real Return  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:PimcoMember
Investment type Mutual funds
Number of shares held | shares 24,115.558
Current Value $ 250,078
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Federal Money Market  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 123,921.58
Current Value $ 12,392
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Global Equity  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 75,113.594
Current Value $ 2,877,602
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , High-Yield Corporate  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 16,714.954
Current Value $ 93,102
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Institutional Index  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 14,518.065
Current Value $ 8,015,133
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , International Growth  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 13,079.62
Current Value $ 1,490,946
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2020  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 60,206.835
Current Value $ 1,652,678
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2025  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 215,477.253
Current Value $ 4,298,771
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2030  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 336,312.889
Current Value $ 14,236,125
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2035  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 275,276.225
Current Value $ 7,537,063
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2040  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 83,639.491
Current Value $ 4,177,793
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2045  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 115,879.517
Current Value $ 4,025,654
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2050  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 65,093.311
Current Value $ 3,858,731
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2055  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 27,170.599
Current Value $ 1,797,607
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2060  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 8,158.151
Current Value $ 497,484
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2065  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 5,858.048
Current Value $ 234,898
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement 2070  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 2,074.111
Current Value $ 65,998
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard , Target Retirement Inc.  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 102,299.75
Current Value $ 1,418,898
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard, Developed Markets Index  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 70,111.137
Current Value $ 1,407,131
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard, Mid-Cap Index  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 5,299.569
Current Value $ 1,904,453
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard, Real Estate Index  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 125.39
Current Value $ 247,060
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard, Retirement Savings Trust III  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Common Collective Trust
Current Value $ 1,697,248
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard, Small-Cap Index  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 15,318.112
Current Value $ 1,893,012
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard, Total Bond Market Index  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Investment issuer name bhb:VanguardMember
Investment type Mutual funds
Number of shares held | shares 221,781.129
Current Value $ 2,166,802
Investment party in interest true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Minimum  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Loan interest rate 4.25%
Maximum  
Schedule H, Line 4i - Schedule of Assets Held at End of Year  
Loan interest rate 9.50%