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Deposits (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deposits [Abstract] |  |
Time Deposits, $250,000 or More | $ 99.1 | $ 66.9
Time Deposits, $100,000 or More | 152.3 | $ 126.5
Deposit Liabilities Reclassified as Loans Receivable | 0.3 |
Related Party Deposit Liabilities | $ 6.2 |

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- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $200,000 or more + References No definition available. + Details
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Namespace Prefix: | func_
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- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
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