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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Shareholders' Equity    
Common stock, par value (in dollars per share) $ 3.13us-gaap_CommonStockParOrStatedValuePerShare $ 3.13us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized (in shares) 8,000,000us-gaap_CommonStockSharesAuthorized 8,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued (in shares) 3,744,562us-gaap_CommonStockSharesIssued 3,730,877us-gaap_CommonStockSharesIssued
Common stock, outstanding (in shares) 3,744,562us-gaap_CommonStockSharesOutstanding 3,730,877us-gaap_CommonStockSharesOutstanding
Common stock, nonvested (in shares) 33,267fbss_CommonStockSharesNonVested 34,965fbss_CommonStockSharesNonVested