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Capitalization (Schedule of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic:
Net Income	$ 3,790us-gaap_NetIncomeLoss	$ 6,758us-gaap_NetIncomeLoss	$ 4,728us-gaap_NetIncomeLoss	$ 3,169us-gaap_NetIncomeLoss	$ 3,168us-gaap_NetIncomeLoss	$ 5,807us-gaap_NetIncomeLoss	$ 4,481us-gaap_NetIncomeLoss	$ 3,177us-gaap_NetIncomeLoss	$ 18,445us-gaap_NetIncomeLoss	$ 16,633us-gaap_NetIncomeLoss	$ 14,396us-gaap_NetIncomeLoss
Preferred Dividend									(151)us-gaap_PreferredStockDividendsIncomeStatementImpact	(190)us-gaap_PreferredStockDividendsIncomeStatementImpact	(206)us-gaap_PreferredStockDividendsIncomeStatementImpact
Earnings Applicable to Common Stock									18,294us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	16,443us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	14,190us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average number of basic shares outstanding, shares									16,052us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	15,868us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	15,733us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic EPS	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic	$ 1.04us-gaap_EarningsPerShareBasic	$ 0.90us-gaap_EarningsPerShareBasic
Diluted:
$7.00 Series Preferred Dividend									74msex_ConvertibleDollar7PreferredSeriesStockDividends	97msex_ConvertibleDollar7PreferredSeriesStockDividends	97msex_ConvertibleDollar7PreferredSeriesStockDividends
$8.00 Series Preferred Dividend									24msex_ConvertibleDollar8PreferredSeriesStockDividends	40msex_ConvertibleDollar8PreferredSeriesStockDividends	56msex_ConvertibleDollar8PreferredSeriesStockDividends
Adjusted Earnings Applicable to Common Stock									$ 18,392us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 16,580us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 14,343us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Incremental common shares attributable to $7.00 series preferred shares, shares									133msex_IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock	166msex_IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock	166msex_IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock
Incremental common shares attributable to $8.00 series preferred shares, shares									41msex_IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock	76msex_IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock	96msex_IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock
Weighted-average diluted shares outstanding, shares									16,226us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	16,110us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	15,995us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted EPS	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted	$ 1.03us-gaap_EarningsPerShareDiluted	$ 0.90us-gaap_EarningsPerShareDiluted

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