XML 56 R45.htm IDEA: XBRL DOCUMENT
v3.19.1

Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) $ in Thousands | Mar. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) item
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 6,235 | $ 9,529
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | $ 480 | $ 487
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 6,000 | 10,000
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 115,753 | $ 122,608
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 5,084 | $ 6,127
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 30,000 | 34,000
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | $ 5,870 | $ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | $ 63 | $ 51
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 3 | 2
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | $ 40,524 | $ 54,908
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | $ 714 | $ 1,556
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 27 | 32
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 0 | $ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | $ 0 | $ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 0 | 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 29,464 | $ 29,026
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 536 | $ 974
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 5 | 5
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | $ 3,623 | $ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | $ 15 | $ 51
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 2 | 2
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | $ 36,833 | $ 41,448
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | $ 652 | $ 1,236
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 26 | 29
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 0 | $ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | $ 0 | $ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 0 | 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 36,976 | $ 37,752
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 1,165 | $ 1,261
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 8 | 8
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value |  | $ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss |  | $ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item |  | 0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |  | $ 7,656
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |  | $ 68
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item |  | 1
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 171 | $ 232
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | $ 1 | $ 1
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 1 | 1
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 34,834 | $ 35,472
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 558 | $ 964
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 8 | 8
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | $ 0 | $ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | $ 0 | $ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 0 | 0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | $ 3,691 | $ 3,605
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | $ 62 | $ 156
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 1 | 1
Obligations of states and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 115 | $ 3,310
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | $ 1 | $ 48
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 1 | 5
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 5,278 | $ 11,068
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 93 | $ 285
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 4 | 8
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | $ 2,247 | $ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | $ 48 | $ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 1 | 0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | $ 0 | $ 2,199
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | $ 0 | $ 96
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 0 | 1
Collateralized debt obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 5,949 | $ 5,987
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | $ 478 | $ 438
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 4 | 4
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 9,201 | $ 9,290
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 2,732 | $ 2,643
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 5 | 5

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
Name: | func_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References No definition available. + Details
Name: | func_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired, in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
Name: | func_HeldToMaturitySecuritiesInUnrealizedLossPositions12MonthsOrLongerNumberOfPositions
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired, in continuous unrealized loss position for less than 12 months. + References No definition available. + Details
Name: | func_HeldToMaturitySecuritiesInUnrealizedLossPositionsLessThan12MonthsNumberOfPositions
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of securities categorized as held-to-maturity that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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

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