Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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Deferred tax assets: | ||
Loans, principally due to allowance for loan losses | $ 28,506us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | $ 30,903us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses |
Deferred Costs, Leasing, Gross | 719us-gaap_DeferredCostsLeasingGross | 0us-gaap_DeferredCostsLeasingGross |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies | 1,785us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies | 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies |
Deferred Discounts, Finance Charges and Interest Included in Receivables | 7,022us-gaap_DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables | 0us-gaap_DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables |
Deferred Tax Assets, Unrealized Losses on Trading Securities | 2,728us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 9,473us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross |
Employee benefits | 8,256us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits | 6,813us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits |
Other real estate owned write-downs and carrying costs | 2,536fibk_DeferredTaxAssetsOtherRealEstateOwnedWriteDownsAndCarryingCosts | 4,731fibk_DeferredTaxAssetsOtherRealEstateOwnedWriteDownsAndCarryingCosts |
Deferred gain on sale of subsidiary | 253fibk_DeferredTaxAssetsDeferredGainSaleOfSubsidiary | 484fibk_DeferredTaxAssetsDeferredGainSaleOfSubsidiary |
Deferred revenue on contract | 481fibk_Deferredrevenueoncontract | 545fibk_Deferredrevenueoncontract |
Other | 760us-gaap_DeferredTaxAssetsOther | 299us-gaap_DeferredTaxAssetsOther |
Deferred tax assets | 53,046us-gaap_DeferredTaxAssetsNet | 53,248us-gaap_DeferredTaxAssetsNet |
Deferred tax liabilities: | ||
Fixed assets, principally differences in bases and depreciation | (569)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (4,227)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Deferred Tax Liabilities, Unrealized Gains on Available For Sale Securities | (1,351)fibk_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities | 0fibk_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities |
Investment in joint venture partnership, principally due to differences in depreciation of partnership assets | (1,053)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates | (700)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates |
Prepaid amounts | (1,385)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | (1,247)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses |
Government agency stock dividends | (2,407)fibk_DeferredTaxLiabilitiesAgencyStockDividends | (1,965)fibk_DeferredTaxLiabilitiesAgencyStockDividends |
Goodwill and core deposit intangibles | (36,732)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets | (28,167)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets |
Mortgage servicing rights | (4,144)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights | (4,337)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights |
Other | (531)us-gaap_DeferredTaxLiabilitiesOther | (451)us-gaap_DeferredTaxLiabilitiesOther |
Deferred tax liabilities | (48,172)us-gaap_DeferredTaxLiabilities | (41,094)us-gaap_DeferredTaxLiabilities |
Net deferred tax assets | 4,874us-gaap_DeferredTaxAssetsLiabilitiesNet | 12,154us-gaap_DeferredTaxAssetsLiabilitiesNet |
Income Taxes Payable, Current | 4,693us-gaap_TaxesPayableCurrent | |
Income Taxes Receivable, Current | $ 2,968us-gaap_IncomeTaxesReceivable |
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Deferred Revenue on Contract No definition available.
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Deferred Tax Assets, Deferred Gain, Sale of Subsidiary No definition available.
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Deferred Tax Assets, Other Real Estate Owned Write-Downs and Carrying Costs No definition available.
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Deferred Tax Liabilities, Agency Stock Dividends No definition available.
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Deferred Tax Liabilities, Unrealized Gains on Available For Sale Securities No definition available.
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