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Earnings Per Share (Stock Options) (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Performance-based Restricted Shares [Member]    
Details of anti dilutive options to purchase common stock    
STOCK OPTIONS 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ indb_PerformancebasedrestrictedstockAxis
= indb_PerformanceBasedRestrictedSharesMember
1,242,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ indb_PerformancebasedrestrictedstockAxis
= indb_PerformanceBasedRestrictedSharesMember
Stock Options or Restricted Stock [Member]    
Details of anti dilutive options to purchase common stock    
STOCK OPTIONS 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ indb_StockOptionsAxis
= indb_StockOptionsOrRestrictedStockMember
0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ indb_StockOptionsAxis
= indb_StockOptionsOrRestrictedStockMember