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Borrowed Funds And Junior Subordinated Debentures (Schedule Of Short-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]      
Amount outstanding $ 13,700us-gaap_ShortTermBorrowings $ 9,000us-gaap_ShortTermBorrowings $ 10,000us-gaap_ShortTermBorrowings
Weighted-average interest rate 0.32%us-gaap_ShortTermDebtWeightedAverageInterestRate 3.41%us-gaap_ShortTermDebtWeightedAverageInterestRate 3.21%us-gaap_ShortTermDebtWeightedAverageInterestRate
Daily average amount outstanding 8,938evbn_ShortTermDebtDailyAverageOutstandingAmount 6,167evbn_ShortTermDebtDailyAverageOutstandingAmount 8,833evbn_ShortTermDebtDailyAverageOutstandingAmount
Weighted-average interest rate for the year ended 2.09%evbn_ShortTermDebtWeightedAverageInterestRateDuringPeriod 3.41%evbn_ShortTermDebtWeightedAverageInterestRateDuringPeriod 3.21%evbn_ShortTermDebtWeightedAverageInterestRateDuringPeriod
Federal Funds Purchased [Member]      
Short-term Debt [Line Items]      
Amount outstanding 13,700us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
   
Weighted-average interest rate 0.32%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
   
Highest amount at a month-end 13,700us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
   
Daily average amount outstanding 3,938evbn_ShortTermDebtDailyAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
   
Weighted-average interest rate for the year ended 0.25%evbn_ShortTermDebtWeightedAverageInterestRateDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
   
Other Short-Term Borrowings [Member]      
Short-term Debt [Line Items]      
Amount outstanding   9,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
10,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
Weighted-average interest rate   3.41%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
3.21%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
Highest amount at a month-end 9,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
10,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
10,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
Daily average amount outstanding $ 5,000evbn_ShortTermDebtDailyAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
$ 6,167evbn_ShortTermDebtDailyAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
$ 8,833evbn_ShortTermDebtDailyAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
Weighted-average interest rate for the year ended 3.54%evbn_ShortTermDebtWeightedAverageInterestRateDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
3.41%evbn_ShortTermDebtWeightedAverageInterestRateDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember
3.21%evbn_ShortTermDebtWeightedAverageInterestRateDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= evbn_OtherShortTermBorrowingsMember