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Net Gains (Tables) | 9 Months Ended
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Sep. 30, 2016
Net Gains [Abstract] |
Net Gains | The following table summarizes the gain/(loss) activity for the nine- and three-month periods ended September 30, 2016 and 2015: ﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |
﻿ | Nine months ended | Three months ended
﻿ | September 30, | September 30,
﻿(in thousands) | 2016 | 2015 | 2016 | 2015
﻿Net gains/(losses): |  |  |  |  |  |  |  |
﻿ Available-for-sale securities: |  |  |  |  |  |  |  |
﻿ Realized gains | $ | 688 | $ | 373 | $ | 273 | $ | 217
﻿ Realized losses |  | (229) |  | (311) |  | (41) |  | (138)
﻿ Gain on sale of consumer loans |  | 66 |  | 40 |  | 18 |  | 16
﻿ Loss on disposal of fixed assets |  | 0 |  | (2) |  | (5) |  | 0
﻿Net gains | $ | 525 | $ | 100 | $ | 245 | $ | 95
﻿

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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