Consolidated Balance Sheets (Parenthetical) (USD $)	Feb. 01, 2015	Dec. 31, 2014	Feb. 01, 2014	Dec. 31, 2013
Assets
Securities held-to-maturity, fair value		$ 42,234,000		$ 38,370,000
Shareholder's Equity
Preferred stock, shares authorized (in shares)		1,000,000us-gaap_PreferredStockSharesAuthorized		1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares)		25us-gaap_PreferredStockSharesIssued		25us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares)		25us-gaap_PreferredStockSharesOutstanding		25us-gaap_PreferredStockSharesOutstanding
Preferred stock liquidation value		$ 100,000CMTV_PreferredStockLiquidationValue		$ 100,000CMTV_PreferredStockLiquidationValue
Common stock par value (in dollars per share)		$ 2.50		$ 2.50
Common stock, shares authorized (in shares)		15,000,000us-gaap_CommonStockSharesAuthorized		15,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares)	16,642us-gaap_CommonStockSharesIssued	5,142,475us-gaap_CommonStockSharesIssued	13,448us-gaap_CommonStockSharesIssued	5,078,707us-gaap_CommonStockSharesIssued
Treasury stock (in shares)		210,101us-gaap_TreasuryStockShares		210,101us-gaap_TreasuryStockShares

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