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     "lang": {
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        "terseLabel": "Deferred tax assets, deferred fees",
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income."
       }
      }
     },
     "auth_ref": [
      "r1871"
     ]
    },
    "func_DeferredTaxAssetsDepreciation": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.mybankfirstunited.com/20251231",
     "localname": "DeferredTaxAssetsDepreciation",
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      }
     },
     "presentation": [
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     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, before allocation of valuation allowance, of deferred tax asset attributable to depreciation.",
        "label": "Deferred Tax Assets Depreciation",
        "terseLabel": "Deferred tax assets, depreciation"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DeferredTaxAssetsGross": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2025",
     "localname": "DeferredTaxAssetsGross",
     "crdr": "debit",
     "calculation": {
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     },
     "presentation": [
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     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Deferred Tax Assets, Gross",
        "totalLabel": "Total deferred tax assets",
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards."
       }
      }
     },
     "auth_ref": [
      "r742"
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    },
    "us-gaap_DeferredTaxAssetsInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2025",
     "localname": "DeferredTaxAssetsInvestments",
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     "calculation": {
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     },
     "presentation": [
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     "lang": {
      "en-us": {
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        "terseLabel": "Deferred tax assets, Low-income housing tax credits",
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments)."
       }
      }
     },
     "auth_ref": [
      "r1871"
     ]
    },
    "func_DeferredTaxAssetsLeaseLiability": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.mybankfirstunited.com/20251231",
     "localname": "DeferredTaxAssetsLeaseLiability",
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     "calculation": {
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     },
     "presentation": [
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     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Deferred Tax Assets Lease Liability",
        "label": "Deferred Tax Assets Lease Liability",
        "terseLabel": "Deferred tax assets, lease liability"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DeferredTaxAssetsLiabilitiesNet": {
     "xbrltype": "monetaryItemType",
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     "crdr": "debit",
     "calculation": {
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     "lang": {
      "en-us": {
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        "totalLabel": "Net deferred tax assets",
        "documentation": "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting."
       }
      }
     },
     "auth_ref": [
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    },
    "us-gaap_DeferredTaxAssetsNet": {
     "xbrltype": "monetaryItemType",
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     "localname": "DeferredTaxAssetsNet",
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     "calculation": {
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     },
     "presentation": [
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     ],
     "lang": {
      "en-us": {
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        "label": "Deferred Tax Assets, Net of Valuation Allowance",
        "totalLabel": "Total deferred tax assets less valuation allowance",
        "documentation": "Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards."
       }
      }
     },
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      "r1867"
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     "localname": "DeferredTaxAssetsOperatingLossCarryforwards",
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     "calculation": {
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     },
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     ],
     "lang": {
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        "label": "Deferred Tax Assets, Operating Loss Carryforwards",
        "terseLabel": "Deferred tax assets, federal and state tax loss carry forwards",
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards."
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     },
     "auth_ref": [
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     "lang": {
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        "terseLabel": "Deferred tax assets, operating loss carryforwards",
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards."
       }
      }
     },
     "auth_ref": [
      "r1871"
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    "us-gaap_DeferredTaxAssetsOther": {
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        "terseLabel": "Deferred Tax Assets, other",
        "documentation": "Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other."
       }
      }
     },
     "auth_ref": [
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    },
    "func_DeferredTaxAssetsOtherRealEstateOwned": {
     "xbrltype": "monetaryItemType",
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     "calculation": {
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     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before allocation of valuation allowance of deferred tax asset attributable to deductible temporary differences from other real estate owned.",
        "label": "Deferred tax assets, other real estate owned",
        "terseLabel": "Deferred tax assets, other real estate owned"
       }
      }
     },
     "auth_ref": []
    },
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     "lang": {
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        "terseLabel": "Deferred tax assets, deferred compensation",
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation."
       }
      }
     },
     "auth_ref": [
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    },
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     "crdr": "debit",
     "calculation": {
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       }
      }
     },
     "auth_ref": [
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    },
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     "nsuri": "http://fasb.org/us-gaap/2025",
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     "lang": {
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     "auth_ref": [
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     "calculation": {
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       }
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     "auth_ref": [
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        "documentation": "Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale)."
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     "auth_ref": [
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        "documentation": "Amount of deferred tax liability attributable to taxable temporary differences from derivatives."
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     "auth_ref": [
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     "auth_ref": [
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      }
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     "auth_ref": []
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        "documentation": "Amount of deferred tax liability attributable to taxable temporary differences classified as other."
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      }
     },
     "auth_ref": [
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        "negatedLabel": "Deferred tax liabilities, pension"
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        "documentation": "Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level."
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