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Network
2414402 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME - Components of Accumulated Other Comprehensive Income (Details)
(http://www.emcins.com/role/AccumulatedOtherComprehensiveIncomeComponentsOfAccumulatedOtherComprehensiveIncomeDetails)
TableSchedule of Accumulated Other Comprehensive Income Loss [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000356130 (http://www.sec.gov/CIK)
Accumulated Other Comprehensive Income Loss [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Equity Components [Axis]Equity Components [Axis]Equity Components [Axis]
Unrealized Gains and (Losses) on Available-for-sale securitiesUnrecognized pension and postretirement benefit obligationsEquity Component [Domain]Unrealized Gains and (Losses) on Available-for-sale securitiesUnrecognized pension and postretirement benefit obligationsEquity Component [Domain]Unrealized Gains and (Losses) on Available-for-sale securitiesUnrecognized pension and postretirement benefit obligationsEquity Component [Domain]
Beginning balance
60,369,000  
(1,936,000) 
58,433,000  
78,362,000  
3,300,000  
81,662,000  
   
Other comprehensive loss before reclassifications
(3,885,000) 
(881,000) 
(4,766,000) 
(13,037,000) 
(3,949,000) 
(16,986,000) 
   
Amounts reclassified from accumulated other comprehensive income
(6,736,000) 
(850,000) 
(7,586,000) 
(4,956,000) 
(1,287,000) 
(6,243,000) 
   
Other comprehensive income (loss)
(10,621,000) 
 
(1,731,000) 
 
(12,352,000) 
 
(17,993,000) 
 
(5,236,000) 
 
(23,229,000) 
 
 
 
 
 
22,652,000  
 
Balance at end of period
49,748,000  
 
(3,667,000) 
 
46,081,000  
 
60,369,000  
 
(1,936,000) 
 
58,433,000  
 
78,362,000  
 
3,300,000  
 
81,662,000