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Loans Receivable (Details 4) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | $ 5,233 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue | $ 5,599 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
60-89 Days Past Due | 1,999 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue | 2,959 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
Greater Than 90 Days Past Due | 2,828 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue | 4,703 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Total Past Due | 10,060 us-gaap_FinancingReceivableRecordedInvestmentPastDue | 13,261 us-gaap_FinancingReceivableRecordedInvestmentPastDue
Current | 480,477 us-gaap_FinancingReceivableRecordedInvestmentCurrent | 474,892 us-gaap_FinancingReceivableRecordedInvestmentCurrent
Total Loans | 490,537 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | 488,153 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Recorded Investments Greater than 90 Days and Accruing | 293 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | 941 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Residential Real Estate Including Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 3,682 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 4,405 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
60-89 Days Past Due | 1,919 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 2,693 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Greater Than 90 Days Past Due | 1,763 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 2,579 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Total Past Due | 7,364 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 9,677 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Current | 177,999 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 179,852 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Total Loans | 185,363 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 189,529 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Recorded Investments Greater than 90 Days and Accruing | 135 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 941 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 | 0 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 | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Current | 346 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 357 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Total Loans | 346 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 357 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 | 700 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 855 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
60-89 Days Past Due | 0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 190 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Greater Than 90 Days Past Due | 736 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,783 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Total Past Due | 1,436 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 2,828 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Current | 212,252 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 208,334 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Total Loans | 213,688 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 211,162 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Recorded Investments Greater than 90 Days and Accruing | 158 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 | 100 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 103 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Total Past Due | 100 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 103 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Current | 2,095 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 2,186 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Total Loans | 2,195 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 2,289 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 | 851 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 339 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
60-89 Days Past Due | 80 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 76 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Greater Than 90 Days Past Due | 229 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 238 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Total Past Due | 1,160 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 653 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Current | 59,740 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 58,029 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Total Loans | 60,900 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 58,682 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 | 28,045 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 26,134 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Total Loans | 28,045 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 26,134 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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