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Loans Receivable (Details 4) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | $ 5,599 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue | $ 5,837 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
60-89 Days Past Due | 2,959 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue | 3,741 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
Greater Than 90 Days Past Due | 4,703 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue | 2,717 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Total Past Due | 13,261 us-gaap_FinancingReceivableRecordedInvestmentPastDue | 12,295 us-gaap_FinancingReceivableRecordedInvestmentPastDue
Current | 474,892 us-gaap_FinancingReceivableRecordedInvestmentCurrent | 425,526 us-gaap_FinancingReceivableRecordedInvestmentCurrent
Total Loans | 488,153 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | 437,821 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Recorded Investments Greater than 90 Days and Accruing | 941 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | 174 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Residential Real Estate Including Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 4,405 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 3,721 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
60-89 Days Past Due | 2,693 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 1,090 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Greater Than 90 Days Past Due | 2,579 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 1,502 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Total Past Due | 9,677 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 6,313 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Current | 179,852 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 155,351 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Total Loans | 189,529 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 161,664 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Recorded Investments Greater than 90 Days and Accruing | 941 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 174 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 1 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
60-89 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Greater Than 90 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Total Past Due | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 1 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Current | 357 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 231 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Total Loans | 357 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 232 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Recorded Investments Greater than 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 855 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,083 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
60-89 Days Past Due | 190 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 2,626 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Greater Than 90 Days Past Due | 1,783 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 768 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Total Past Due | 2,828 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 4,477 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Current | 208,334 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 190,872 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Total Loans | 211,162 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 195,349 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Recorded Investments Greater than 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Commercial Participations Purchased [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 0 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
60-89 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Greater Than 90 Days Past Due | 103 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 0 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Total Past Due | 103 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Current | 2,186 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 1,273 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Total Loans | 2,289 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 1,273 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Recorded Investments Greater than 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Commercial Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 339 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 1,032 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
60-89 Days Past Due | 76 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 25 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Greater Than 90 Days Past Due | 238 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 447 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Total Past Due | 653 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 1,504 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Current | 58,029 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 56,212 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Total Loans | 58,682 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 57,716 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Recorded Investments Greater than 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Government [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
60-89 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Greater Than 90 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Total Past Due | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Current | 26,134 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 21,587 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Total Loans | 26,134 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 21,587 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Recorded Investments Greater than 90 Days and Accruing | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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