XML 65 R44.htm IDEA: XBRL DOCUMENT
v3.6.0.2

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Low Income Housing Project Investments [Abstract] |
Investments in Low Income Housing Projects [Table Text Block] | The following table presents certain information related to the Company's investments in low income housing projects as of December 31:
| 2016 |  | 2015 |  | 2014
| (Dollars in thousands)
Original investment value | $ | 47,379 |  |  | $ | 42,199 |  |  | $ | 40,541 |
Current recorded investment | $ | 39,606 |  |  | $ | 38,151 |  |  | $ | 38,943 |
Unfunded liability obligation | $ | 12,161 |  |  | $ | 14,607 |  |  | $ | 28,004 |
Tax credits and benefits earned during the year | $ | 5,366 |  |  | $ | 3,632 |  |  | $ | 1,683 |
Amortization of investments during the year | $ | 3,725 |  |  | $ | 2,450 |  |  | $ | 1,089 |
Net income tax benefit recognized during the year | $ | 1,641 |  |  | $ | 1,182 |  |  | $ | 594 |

X
- Definition [Table Text Block] for Investments in Low Income Housing Projects [Table] + References No definition available. + Details
Name: | indb_InvestmentsinLowIncomeHousingProjectsTableTextBlock
Namespace Prefix: | indb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Low Income Housing Project Investments [Abstract] + References No definition available. + Details
Name: | indb_LowIncomeHousingProjectInvestmentsAbstract
Namespace Prefix: | indb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration