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v3.19.3

Assets and Liabilities Subject to Enforceable Master Netting Agreements (Schedule of Liabilities Subject to an Enforceable Master Netting Arrangement or Repurchase Agreements) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment security collateral as a percentage of borrowing | 102.00% |
Interest Rate Swap [Member] |  |
Gross Amounts of Recognized (Assets)/Liabilities | $ 383 | $ (1,043)
Net Amounts of (Assets)/Liabilities Presented in the Statement of Condition | 383 | (1,043)
Gross Amounts Not Offset in the Statement of Condition: Financial Instruments | (383) | 1,043
Net Amount |  |
Repurchase Agreements [Member] |  |
Gross Amounts of Recognized (Assets)/Liabilities | 50,345 | 37,707
Net Amounts of (Assets)/Liabilities Presented in the Statement of Condition | 50,345 | 37,707
Gross Amounts Not Offset in the Statement of Condition: Financial Instruments | (50,345) | (37,707)
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_GrossAmountsNotOffsetInStatementOfConditionFinancialInstruments
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 Investment security collateral as a percentage of borrowing + References No definition available. + Details
Name: | func_InvestmentSecurityCollateralAsPercentageOfBorrowing
Namespace Prefix: | func_
Data Type: | num:percentItemType
Balance Type: | na
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_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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