XML 70 R60.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans and Related Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) contract | Mar. 31, 2017 contract | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Commercial amount benchmark minimum for internal annual review | $ 500,000 |  |
Commercial amount benchmark minimum for annual review by independent reviewer | 1,000,000 |  |
Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer | 500,000 |  |
Nonaccrual loans | 4,301,000 |  | $ 7,118,000
Loans in process of foreclosure | $ 300,000 |  | $ 400,000
Accruing loans past due 30 days or greater as percent of loan portfolio | 1.14% |  | 0.63%
Partial Charge Off [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Nonaccrual loans | $ 1,900,000 |  | $ 2,100,000
New TDR [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing receivable, modifications, number of contracts | contract | 0 | 0 |
Pre Existing TDR Loans Remodified After Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing receivable, modifications, number of contracts | contract |  | 2 |
Commercial real estate- non owner-occupied [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Nonaccrual loans | $ 1,577,000 |  | 3,248,000
Commercial and industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Nonaccrual loans | $ 26,000 |  | $ 378,000

X
- Definition Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer. + References No definition available. + Details
Name: | func_CommercialAmountBenchmarkMinimumCriticizedRelationshipsForAnnualReviewByIndependentReviewer
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commerical amount benchmark minimum for internal annual review. + References No definition available. + Details
Name: | func_CommericalAmountBenchmarkMinimumForAnnualReview
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commerical amount benchmark minimum for annual review by independent reviewer. + References No definition available. + Details
Name: | func_CommericalAmountBenchmarkMinimumForAnnualReviewByIndependentReviewer
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of financing receivable balance that is past due. + References No definition available. + Details
Name: | us-gaap_FinancingReceivablePercentPastDue1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL49126937-111524 + Details
Name: | us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=func_PartialChargeOffMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=func_NewTroubledDebtRestructingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=func_PreExistingTroubledDebtRestructingLoansRemodifiedAfterMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |