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Cash and Cash Equivalents (Schedules of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Cash and due from banks | $ 22,187 | $ 82,273
Interest bearing deposits in banks | $ 1,354 | 1,479
Cash and Due from Banks [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Interest rate | 0.58% |
FHLB [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Interest bearing deposits in banks | $ 338 | 464
Interest rate | 2.30% |
M&T Fed Funds sold [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Interest bearing deposits in banks | $ 1,016 | $ 1,015
Interest rate | 0.15% |

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- Definition Percentage of interest income earned on a cash and cash equivalents account. + References No definition available. + Details
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Namespace Prefix: | func_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Balance Type: | debit
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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=73530178&loc=d3e59706-112781 + Details
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Period Type: | instant

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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |