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BORROWINGS (Short-Term Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Line of credit amount outstanding $ 0us-gaap_LineOfCredit $ 5,000us-gaap_LineOfCredit
Short-term Debt 147,890us-gaap_ShortTermBorrowings 154,288us-gaap_ShortTermBorrowings
Customer Repurchase Agreements [Member]    
Short-term Debt [Line Items]    
Customer Repurchase Agreements $ 147,890indb_CustomerRepurchaseAgreements
/ us-gaap_ShortTermDebtTypeAxis
= indb_CustomerRepurchaseAgreementsMember
$ 149,288indb_CustomerRepurchaseAgreements
/ us-gaap_ShortTermDebtTypeAxis
= indb_CustomerRepurchaseAgreementsMember