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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 | Mar. 31, 2017 | Dec. 31, 2016
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Interest Rate Swap [Member] |  |
Gross Amounts of Recognized Liabilities | $ (786) | $ (700)
Gross Amounts Offset in the Statement of Condition | 0 | 0
Net Amounts of Liabilities Presented in the Statement of Condition | (786) | (700)
Gross Amounts Not Offset in the Statement of Condition: Financial Instruments | 786 | 700
Gross Amounts Not Offset in the Statement of Condition: Cash Collateral Pledged | 0 | 0
Net amount | 0 | 0
Repurchase Agreements [Member] |  |
Gross Amounts of Recognized Liabilities | 35,269 | 36,000
Gross Amounts Offset in the Statement of Condition | 0 | 0
Net Amounts of Liabilities Presented in the Statement of Condition | 35,269 | 36,000
Gross Amounts Not Offset in the Statement of Condition: Financial Instruments | (35,269) | (36,000)
Gross Amounts Not Offset in the Statement of Condition: Cash Collateral Pledged | 0 | 0
Net amount | $ 0 | $ 0

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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_GrossAmountsNotOffsetInStatmentOfConditionCashCollateralPledged
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_GrossAmountsNotOffsetInStatmentOfConditionFinancialInsturments
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_GrossAmountsOffsetInStatementOfConditionForMasterNettingAgreements
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_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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