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Fair Value (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Values of Financial Instruments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 3,500
Unpaid Principal Balance	3,100	$ 2,500
Impaired Financing Receivable, Reserve	62	704
Impaired Financing Receivable, Fair Value	$ 3,000	$ 1,800

X

- Definition

Fair Values of Financial Instruments

+ References

No definition available.

+ Details

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Namespace Prefix:	nwin_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value of investment related to impaired financing receivables.

+ References

No definition available.

+ Details

Name:	nwin_ImpairedFinancingReceivableFairValue
Namespace Prefix:	nwin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying amount of reserve related to impaired financing receivable.

+ References

No definition available.

+ Details

Name:	nwin_ImpairedFinancingReceivableReserve
Namespace Prefix:	nwin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant