XML 83 R71.htm IDEA: XBRL DOCUMENT
v3.25.3

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2019
Derivative [Line Items] |  |  |
Notional Amount | $ 1,152,292 | $ 925,402 |
Fair Value Asset (Liability) | 1,882 | 2,292 |
Designated as hedging instrument | Cash flow hedges |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 50,000 | 75,000 |
Fair Value Asset (Liability) | (747) | (1,775) |
Designated as hedging instrument | Cash flow hedges | Interest rate swap on wholesale funding |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  | $ 25,000 |
Weighted Average Maturity (in years) |  | 3 months 18 days |
Fair Value Asset (Liability) |  | $ 261 |
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 50,000 | $ 50,000 |
Weighted Average Maturity (in years) | 6 months | 1 year 2 months 12 days |
Fair Value Asset (Liability) | $ (747) | $ (2,036) |
Designated as hedging instrument | Fair Value Hedging |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 37,190 | 37,190 |
Fair Value Asset (Liability) | 2,524 | 3,969 |
Designated as hedging instrument | Fair Value Hedging | Interest rate swap on deposits |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 37,190 | $ 37,190 | $ 37,200
Weighted Average Maturity (in years) | 3 years 9 months 18 days | 4 years 7 months 6 days |
Fair Value Asset (Liability) | $ 2,524 | $ 3,969 |
Carrying Amount of Hedged Assets | 30,837 | 31,627 |
Cumulative Amount of Fair Value Hedging Adjustment in Carrying Amount | (6,353) | (5,563) |
Designated as hedging instrument | Economic hedges |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 1,061,345 | 809,452 |
Fair Value Asset (Liability) | (6) | 13 |
Designated as hedging instrument | Economic hedges | Forward sale commitments |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 8,543 | 4,786 |
Fair Value Asset (Liability) | (6) | 13 |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | MNA counterparty |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 329,769 | $ 240,031 |
Weighted Average Maturity (in years) | 4 years 3 months 18 days | 4 years 3 months 18 days |
Fair Value Asset (Liability) | $ (4,969) | $ (14,243) |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | RPA counterparty |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 196,632 | $ 162,302 |
Weighted Average Maturity (in years) | 4 years 8 months 12 days | 5 years 2 months 12 days |
Fair Value Asset (Liability) | $ (2,273) | $ (286) |
Designated as hedging instrument | Economic hedges | Customer loan derivative asset | Customer |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 526,401 | $ 402,333 |
Weighted Average Maturity (in years) | 4 years 4 months 24 days | 4 years 8 months 12 days |
Fair Value Asset (Liability) | $ 7,242 | $ 14,529 |
Not designated as hedging instrument |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 3,757 | 3,760 |
Fair Value Asset (Liability) | 111 | 85 |
Not designated as hedging instrument | Interest Rate Lock Commitment |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 3,757 | $ 3,760 |
Weighted Average Maturity (in years) | 1 month 6 days | 1 month 6 days |
Fair Value Asset (Liability) | $ 111 | $ 85 |

X
- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageRemainingMaturity1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE + Details
Name: | us-gaap_HedgedAssetFairValueHedge
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. Excludes cumulative basis adjustment related to foreign exchange risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 + Details
Name: | us-gaap_HedgedAssetFairValueHedgeCumulativeIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=bhb_InterestRateSwapOnWholesaleFundingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=bhb_InterestRateSwapOnVariableRateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=bhb_EconomicHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=bhb_CustomerLoanDerivativeLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=bhb_MnaCounterpartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=bhb_RpaCounterpartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=bhb_CustomerLoanDerivativeAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=bhb_CustomerCounterpartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |