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Cash and Cash Equivalents (Cash and Cash Equivalents) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Cash and Cash Equivalents [Line Items]      
Cash and due from banks $ 37,276us-gaap_CashAndDueFromBanks $ 27,554us-gaap_CashAndDueFromBanks $ 27,554us-gaap_CashAndDueFromBanks
Interest bearing deposits in banks 7,949us-gaap_InterestBearingDepositsInBanks 7,897us-gaap_InterestBearingDepositsInBanks 7,897us-gaap_InterestBearingDepositsInBanks
Interest Rate 0.07%func_InterestRate    
FHLB [Member]      
Cash and Cash Equivalents [Line Items]      
Interest bearing deposits in banks 1,033us-gaap_InterestBearingDepositsInBanks
/ us-gaap_CashAndCashEquivalentsAxis
= func_FhlbMember
983us-gaap_InterestBearingDepositsInBanks
/ us-gaap_CashAndCashEquivalentsAxis
= func_FhlbMember
 
Interest Rate 0.005%func_InterestRate
/ us-gaap_CashAndCashEquivalentsAxis
= func_FhlbMember
   
FTN [Member]      
Cash and Cash Equivalents [Line Items]      
Interest bearing deposits in banks 850us-gaap_InterestBearingDepositsInBanks
/ us-gaap_CashAndCashEquivalentsAxis
= func_FtnMember
850us-gaap_InterestBearingDepositsInBanks
/ us-gaap_CashAndCashEquivalentsAxis
= func_FtnMember
 
Interest Rate 0.12%func_InterestRate
/ us-gaap_CashAndCashEquivalentsAxis
= func_FtnMember
   
M&T Fed Funds sold [Member]      
Cash and Cash Equivalents [Line Items]      
Interest bearing deposits in banks $ 6,066us-gaap_InterestBearingDepositsInBanks
/ us-gaap_CashAndCashEquivalentsAxis
= func_MTFedFundsSoldMember
$ 6,064us-gaap_InterestBearingDepositsInBanks
/ us-gaap_CashAndCashEquivalentsAxis
= func_MTFedFundsSoldMember
 
Interest Rate 0.15%func_InterestRate
/ us-gaap_CashAndCashEquivalentsAxis
= func_MTFedFundsSoldMember