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v3.20.1

Assets and Liabilities Subject to Enforceable Master Netting Arrangements (Schedule of Liabilities Subject to an Enforceable Master Netting Arrangement or Repurchase Agreements) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Repurchase Agreements [Member] |  |
Gross Amountsof Recognized(Assets)/Liabilities | $ 48,728 | $ 37,707
Net Amounts of(Assets)/LiabilitiesPresented in theStatement ofCondition | 48,728 | 37,707
Gross Amounts Not Offset in the Statment of Condition: Financial Instruments | (48,728) | (37,707)
Gross Amounts Not Offset in the Statment of Condition: Cash Collateral Pledged |  |
Net amount |  |
Interest Rate Swap Agreements [Member] |  |
Gross Amountsof Recognized(Assets)/Liabilities | 133 | (1,043)
Net Amounts of(Assets)/LiabilitiesPresented in theStatement ofCondition | 133 | (1,043)
Gross Amounts Not Offset in the Statment of Condition: Financial Instruments | (133) | 1,043
Gross Amounts Not Offset in the Statment of Condition: Cash Collateral Pledged |  |
Net amount |  |

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- Definition Information on the swap contracts and the repurchase agreements related to netting arrangements + References No definition available. + Details
Name: | func_GrossAmountsNotOffsetInStatementOfConditionCashCollateralPledged
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Information on the swap contracts and the repurchase agreements related to netting arrangements + References No definition available. + Details
Name: | func_GrossAmountsNotOffsetInStatementOfConditionFinancialInsturments
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Information on the swap contracts and the repurchase agreements related to netting arrangements + References No definition available. + Details
Name: | func_GrossAmountsOfRecognizedLiabilitiesForMasterNettingAgreements
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Information on the swap contracts and the repurchase agreements related to netting arrangements + References No definition available. + Details
Name: | func_MasterNettingArrangementNetAmount
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Information on the swap contracts and the repurchase agreements related to netting arrangements + References No definition available. + Details
Name: | func_NetAmountsOfLiabilitiesPresentedInStatementOfConditionForMasterNettingAgreements
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_RepurchaseAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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