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Consolidated Balance Sheets (Parentheticals) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]      
Loans, allowance for credit losses (in dollars) $ 3,117,870us-gaap_LoansAndLeasesReceivableAllowance $ 2,972,019us-gaap_LoansAndLeasesReceivableAllowance $ 3,307,920us-gaap_LoansAndLeasesReceivableAllowance
Common stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized 15,000,000us-gaap_CommonStockSharesAuthorized 15,000,000us-gaap_CommonStockSharesAuthorized 15,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued 2,760,964us-gaap_CommonStockSharesIssued 2,747,370us-gaap_CommonStockSharesIssued 2,736,978us-gaap_CommonStockSharesIssued
Common stock, outstanding 2,760,964us-gaap_CommonStockSharesOutstanding 2,747,370us-gaap_CommonStockSharesOutstanding 2,736,978us-gaap_CommonStockSharesOutstanding