XML 129 R118.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Fair Value of Financial Instruments - (As Restated) (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) security | Dec. 31, 2014 USD ($)
Fair Value of Financial Instruments - (As Restated) [Abstract] |  |
Acquired Trust Preferred Securities, Number of Securities | security | 12 |
Trust Preferred Securities, Amortized Cost | $ 29,300 |
Trust Preferred Securities, Fair Value | 22,200 |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0 | $ 0

X
- Definition Acquired Trust Preferred Securities, Number of Securities + References No definition available. + Details
Name: | func_AcquiredTrustPreferredSecuritiesNumberOfSecurities
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost of preferred stocks issued by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References No definition available. + Details
Name: | func_TrustPreferredSecuritiesAmortizedCost
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair Value of preferred stocks issued by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References No definition available. + Details
Name: | func_TrustPreferredSecuritiesFairValueDisclosure
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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