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v3.19.3

Loans and Related Allowance for Loan Losses (Modification of Troubled Debt Restructuring by Class) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) contract | Sep. 30, 2018 USD ($) contract | Sep. 30, 2019 USD ($) contract | Sep. 30, 2018 USD ($) contract
Temporary Rate Modification [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 1 |  | 1 |
Recorded Investment | $ | $ 149 |  | $ 149 |
Temporary Rate Modification [Member] | Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 1 |  | 1 |
Recorded Investment | $ | $ 149 |  | $ 149 |
Extended Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  | 1 |  | 2
Recorded Investment | $ |  | $ 387 |  | $ 566
Extended Maturity [Member] | Commercial real estate- all other CRE [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  |  |  | 1
Recorded Investment | $ |  |  |  | $ 179
Extended Maturity [Member] | Acquisition and development- 1-4 family residential construction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  | 1 |  | 1
Recorded Investment | $ |  | $ 387 |  | $ 387
Modification Of Payment And Other Terms [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  |  | 2 | 1
Recorded Investment | $ |  |  | $ 470 | $ 126
Modification Of Payment And Other Terms [Member] | Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  |  |  | 1
Recorded Investment | $ |  |  |  | $ 126
Modification Of Payment And Other Terms [Member] | Acquisition and development- All other A&D [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  |  | 1 |
Recorded Investment | $ |  |  | $ 227 |
Modification Of Payment And Other Terms [Member] | Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  |  | 1 |
Recorded Investment | $ |  |  | $ 243 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings during the period. + References No definition available. + Details
Name: | func_NumberOfContracts
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings during the period. + References No definition available. + Details
Name: | func_RecordedInvestment
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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