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Related Party Transactions (Details Textual) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Related Party Transaction [Line Items] |  |
Loans and Leases Receivable, Related Parties | $ 4,098 us-gaap_LoansAndLeasesReceivableRelatedParties | $ 4,900 us-gaap_LoansAndLeasesReceivableRelatedParties
Deposits, Total | 633,946 us-gaap_Deposits | 572,893 us-gaap_Deposits
Directors and Executive Officers [Member] |  |
Related Party Transaction [Line Items] |  |
Deposits, Total | 2,200 us-gaap_Deposits / us-gaap_TitleOfIndividualAxis = nwin_DirectorsAndExecutiveOfficersMember | 3,900 us-gaap_Deposits / us-gaap_TitleOfIndividualAxis = nwin_DirectorsAndExecutiveOfficersMember
Directors and Executive Officers [Member] | Minimum [Member] |  |
Related Party Transaction [Line Items] |  |
Loans and Leases Receivable, Related Parties | $ 120 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TitleOfIndividualAxis = nwin_DirectorsAndExecutiveOfficersMember |

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |