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Net Gains (Tables) | 3 Months Ended
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Mar. 31, 2017
Net Gains [Abstract] |
Net Gains | The following table summarizes the gain/(loss) activity for the three-month periods ended March 31, 2017 and 2016: ﻿ ﻿ ﻿
﻿ |  |  |  |
﻿ | Three months ended
﻿ | March 31,
﻿(in thousands) | 2017 | 2016
﻿Net gains/(losses): |  |  |  |
﻿ Available-for-sale securities: |  |  |  |
﻿ Realized gains | $ | 8 | $ | 277
﻿ Realized losses |  | (17) |  | (71)
﻿ Gain on sale of consumer loans |  | 15 |  | 12
﻿ Loss on disposal of fixed assets |  | (1) |  | (2)
﻿Net gains | $ | 5 | $ | 216
﻿

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- Definition Schedule of gains or losses reported in income statement + References No definition available. + Details
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Namespace Prefix: | func_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration

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- Definition Net Gains/Losses [Abstract]. + References No definition available. + Details
Name: | func_NetGainsLossesAbstract
Namespace Prefix: | func_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration