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Net Gains (Tables) | 3 Months Ended
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Mar. 31, 2014
Net Gains [Abstract] |
Net Gains [Table Text Block] |
| Three months ended
| March 31,
(in thousands) | 2014 | 2013
Net (losses)/gains – other: |  |  |  |
Available-for-sale securities: |  |  |  |
Realized gains | $ | 95 | $ | 412
Realized losses |  | (163) |  | (162)
Gain on sale of consumer loans |  | 8 |  | 79
Loss on disposal of fixed assets |  | (3) |  | 0
Net (losses)/gains – other | $ | (63) | $ | 329

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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
Balance Type: | na
Period Type: | duration

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- Details
Name: | func_NetGainsAbstract
Namespace Prefix: | func_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration