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Deposits (Insured or collateralized to uninsured deposits) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Deposits [Abstract] |  |
Insured or Collateralized Deposit | $ 1,125,896 | $ 1,118,190
Percentage of aggregate liabilities related to insured or collateralized deposits | 71.00% | 71.00%
Uninsured Deposit | $ 465,389 | $ 452,543
Percentage of aggregate liabilities related to uninsured deposits | 29.00% | 29.00%
Deposits total | $ 1,591,285 | $ 1,570,733
Percentage of aggregate liabilities related to insured or collateralized and uninsured deposits | 100.00% | 100.00%

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- Definition Insured or collateralized deposit. + References No definition available. + Details
Name: | func_InsuredOrCollateralizedDeposit
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage of aggregate liabilities related to insured or collateralized and uninsured deposits. + References No definition available. + Details
Name: | func_PercentageOfAggregateLiabilitiesRelatedToInsuredOrCollateralizedAndUninsuredDeposits
Namespace Prefix: | func_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of aggregate liabilities related to insured or collateralized deposits. + References No definition available. + Details
Name: | func_PercentageOfAggregateLiabilitiesRelatedToInsuredOrCollateralizedDeposits
Namespace Prefix: | func_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of aggregate liabilities related to uninsured deposits. + References No definition available. + Details
Name: | func_PercentageOfAggregateLiabilitiesRelatedToUninsuredDeposits
Namespace Prefix: | func_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Uninsured deposit. + References No definition available. + Details
Name: | func_UninsuredDeposit
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_Deposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration