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Income Taxes (Reconciliation of Federal Income Tax Rate to Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Federal statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax-exempt income on securities and loans	(8.20%)func_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeOnSecuritiesAndLoansPercent	(7.30%)func_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeOnSecuritiesAndLoansPercent
Tax-exempt BOLI income	(7.10%)func_EffectiveIncomeTaxRateReconciliationTaxExemptBankOwnedLifeInsuranceIncome	(4.20%)func_EffectiveIncomeTaxRateReconciliationTaxExemptBankOwnedLifeInsuranceIncome
State income tax, net of federal tax benefit	5.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	7.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax credits	(7.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(5.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Other	0.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective Income Tax Rate Reconciliation, Percent, Total	18.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations	25.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from income on bank owned life insurance.

+ References

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- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from securities and loans.

+ References

No definition available.

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X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(2))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 2

-Article 4

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Topic 740

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-Paragraph 1

-Subparagraph (SAB TOPIC 6.I)

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

+ References

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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