XML 99 R80.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies [Line Items] |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 58,249 | $ 55,830
Standby Letters of Credit [Member] |  |
Commitments and Contingencies [Line Items] |  |
Letters of Credit Outstanding, Amount | $ 9,900 | $ 7,800
Minimum [Member] |  |
Commitments and Contingencies [Line Items] |  |
Loans Receivable Fixed Rates Of Interest | 2.99% | 2.99%
Maximum [Member] |  |
Commitments and Contingencies [Line Items] |  |
Loans Receivable Fixed Rates Of Interest | 10.00% | 10.00%

X
- References No definition available. + Details
Name: | nwin_CommitmentsAndContingenciesLineItems
Namespace Prefix: | nwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of fixed rates of interest related to loan receivables. + References No definition available. + Details
Name: | nwin_LoansReceivableFixedRatesOfInterest
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61044-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61082-112788 + Details
Name: | us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |