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Loans - Loans by Class Modified as Troubled Debt Restructurings with Payment Default (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
SecurityLoan
Mar. 31, 2014
SecurityLoan
Financing Receivable Modifications [Line Items]    
Number of loans 3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 13us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Recorded Investment $ 232us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 $ 2,215us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Commercial Loans [Member]    
Financing Receivable Modifications [Line Items]    
Number of loans   4us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
Recorded Investment   1,435us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Loans [Member] | Multifamily [Member]    
Financing Receivable Modifications [Line Items]    
Number of loans   1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_MultifamilyLoanMember
Recorded Investment   460us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_MultifamilyLoanMember
Commercial Loans [Member] | Land [Member]    
Financing Receivable Modifications [Line Items]    
Number of loans   2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_RealEstateLoanMember
Recorded Investment   487us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_RealEstateLoanMember
Commercial Loans [Member] | Construction [Member]    
Financing Receivable Modifications [Line Items]    
Number of loans   1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Recorded Investment   488us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Residential Mortgage Loans [Member]    
Financing Receivable Modifications [Line Items]    
Number of loans 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
Recorded Investment 217us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 550us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
Residential Mortgage Loans [Member] | One-to Four-Family [Member]    
Financing Receivable Modifications [Line Items]    
Number of loans 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_OneToFourFamilyResidentialMember		 3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_OneToFourFamilyResidentialMember
Recorded Investment 217us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_OneToFourFamilyResidentialMember		 550us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_OneToFourFamilyResidentialMember
Consumer Loans [Member]    
Financing Receivable Modifications [Line Items]    
Number of loans 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		 6us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
Recorded Investment 15us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		 230us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
Consumer Loans [Member] | Home Equity [Member]    
Financing Receivable Modifications [Line Items]    
Number of loans 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_HomeEquityLoanMember		 6us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_HomeEquityLoanMember
Recorded Investment $ 15us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_HomeEquityLoanMember		 $ 230us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ ucfc_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ucfc_HomeEquityLoanMember