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Summary of Significant Accounting Policies (Details Textual) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |
Goodwill | $ 1,611,000 us-gaap_Goodwill | $ 0 us-gaap_Goodwill
Loans Receivable, Fair Value Disclosure | 480,736,000 us-gaap_LoansReceivableFairValueDisclosure | 427,719,000 us-gaap_LoansReceivableFairValueDisclosure
Amortization of Intangible Assets | 9,000 us-gaap_AmortizationOfIntangibleAssets |
First Federal Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 39,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities | 3,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember |
Business Combination, Acquired Receivables, Fair Value | 29,100,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 967,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land | 690,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 37,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember |
Goodwill | 1,600,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember |
Finite-lived Intangible Assets Acquired | 93,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember |
Federal Reserve Bank [Member] |  |
Business Acquisition [Line Items] |  |
Cash | 827,000 us-gaap_Cash / nwin_BankingAxis = nwin_FederalReserveBankMember | 656,000 us-gaap_Cash / nwin_BankingAxis = nwin_FederalReserveBankMember
Premises And Equipment [Member] | Minimum [Member] |  |
Business Acquisition [Line Items] |  |
Property, Plant and Equipment, Useful Life | 26 years |
Premises And Equipment [Member] | Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Property, Plant and Equipment, Useful Life | 39 years |
Furniture and Equipment [Member] | Minimum [Member] |  |
Business Acquisition [Line Items] |  |
Property, Plant and Equipment, Useful Life | 2 years |
Furniture and Equipment [Member] | Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Property, Plant and Equipment, Useful Life | 10 years |
Core Deposits [Member] |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 7 years 10 months 24 days |
Finite-Lived Intangible Assets, Amortization Method | straight line basis |
Core Deposits [Member] | First Federal Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 7,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
Certificates of Deposit [Member] |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 17 months |
Amortization of Intangible Assets | 126,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 150,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |
Deposits, Fair Value Disclosure | 276,000 us-gaap_DepositsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |
Finite-Lived Intangible Assets, Amortization Method | straight line basis |
Certificates of Deposit [Member] | First Federal Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 29,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = nwin_FirstFederalAcquisitionMember / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |
Home Equity Line of Credit [Member] |  |
Business Acquisition [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 1,100,000 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember |
Finite-Lived Intangible Asset, Useful Life | 55 months |
Finite-Lived Intangible Assets, Amortization Method | straight line basis |
Home Equity Line of Credit [Member] | Loans Receivable [Member] |  |
Business Acquisition [Line Items] |  |
Amortization of Intangible Assets | 318,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 206,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | $ 171,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember |

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The amortization method of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. The straight-line method is the preferred amortization method, unless another method better reflects the pattern in which the asset is consumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=26713198&loc=d3e15372-109273 + Details
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