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Employee Benefit Plans (Schedule of Restricted Stock Plan) (Details) (2008 Restricted Stock Plan [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
2008 Restricted Stock Plan [Member] |  |  |
Shares |  |  |
Balance | 117 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 114 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 108 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Granted | 33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 21 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Vested | (22)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | (24)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | (15)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Forfeited | (1)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | (1)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Amortization of Compensation Expense |  |  |
Balance | 127 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 117 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 114 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Unearned compensation |  |  |
Balance | $ 1,216 msex_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateValueUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 1,039 msex_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateValueUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 1,079 msex_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateValueUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Granted | 711 msex_GrantedUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 589 msex_GrantedUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 408 msex_GrantedUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Vested |  |  |
Forfeited | (10)msex_ForfeitedUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | (12)msex_ForfeitedUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Amortization of Compensation Expense | (434)msex_AmortizationOfCompensationExpenseUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | (400)msex_AmortizationOfCompensationExpenseUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | (448)msex_AmortizationOfCompensationExpenseUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Balance | $ 1,483 msex_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateValueUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 1,216 msex_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateValueUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 1,039 msex_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateValueUnearnedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Weighted Average Grant Price |  |  |
Granted | $ 21.46 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 21.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 19.35 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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