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Net Gains (Tables) | 6 Months Ended
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Jun. 30, 2017
Net Gains [Abstract] |
Net Gains | The following table summarizes the gain/(loss) activity for the six- and three-month periods ended June 30, 2017 and 2016: ﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |
﻿ | Six months ended | Three months ended
﻿ | June 30, | June 30,
﻿(in thousands) | 2017 | 2016 | 2017 | 2016
﻿Net gains/(losses): |  |  |  |  |  |  |  |
﻿ Available-for-sale securities: |  |  |  |  |  |  |  |
﻿ Realized gains | $ | 52 | $ | 415 | $ | 44 | $ | 138
﻿ Realized losses |  | (69) |  | (188) |  | (52) |  | (117)
﻿ Gain on sale of consumer loans |  | 32 |  | 48 |  | 17 |  | 36
﻿ (Loss)/gain on disposal of fixed assets |  | (1) |  | 5 |  | 0 |  | 7
﻿Net gains | $ | 14 | $ | 280 | $ | 9 | $ | 64
﻿

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