$ISTR
Investar Holding Corp Stock $istr

$istr Overview Financials Valuation SEC Filings Company Website

2014 Q4 Form 10-K Financial Statement

#000156459016014510 Filed on March 11, 2016

Income Statement

Concept	2014 Q4	2014 Q3	2014 Q2
Revenue	$8.822M	$8.182M	$7.407M
YoY Change	33.57%	31.31%	33.39%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$390.0K	$310.0K	$340.0K
YoY Change	44.44%	40.91%	61.9%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$1.245M	$1.182M	$1.158M
YoY Change	24.25%	26.82%	38.52%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$1.517M	$2.141M	$1.581M
YoY Change	466.04%	114.96%	-26.53%
Income Tax	-$491.0K	$699.0K	$514.0K
% Of Pretax Income	-32.37%	32.65%	32.51%
Net Earnings	$2.008M	$1.442M	$1.067M
YoY Change	1028.09%	113.95%	-37.12%
Net Earnings / Revenue	22.76%	17.62%	14.41%
Basic Earnings Per Share	$0.28	$0.20	$0.27
Diluted Earnings Per Share	$0.27	$0.20	$0.26
COMMON SHARES
Basic Shares Outstanding	7.254M	7.065M	3.902M
Diluted Shares Outstanding		7.312M	4.162M

Balance Sheet

Concept	2014 Q4	2014 Q3	2014 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$19.01M	$18.73M	$15.15M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$28.54M	$27.85M	$27.68M
YoY Change	15.63%
Goodwill	$2.684M	$2.684M	$2.684M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$1.100M	$1.100M	$700.0K
YoY Change	-8.33%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$881.2M	$784.6M	$729.1M
YoY Change	38.78%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable		$300.0K	$300.0K
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$12.30M	$12.10M	$11.40M
YoY Change	20.59%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$6.200M	$6.800M	$4.000M
YoY Change	181.82%
LONG-TERM LIABILITIES
Long-Term Debt	$3.600M	$3.600M	$8.600M
YoY Change	0.0%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$3.600M	$3.600M	$8.600M
YoY Change	0.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$6.200M	$6.800M	$4.000M
Total Long-Term Liabilities	$3.600M	$3.600M	$8.600M
Total Liabilities	$776.0M	$682.4M	$671.1M
YoY Change	33.91%
SHAREHOLDERS EQUITY
Retained Earnings	$11.81M	$9.852M	$8.458M
YoY Change	78.68%
Common Stock	$91.48M	$7.255M	$3.945M
YoY Change	85.84%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$23.00K	$22.00K	$4.000K
YoY Change
Treasury Stock Shares
Shareholders Equity	$103.4M	$102.2M	$57.94M
YoY Change
Total Liabilities & Shareholders Equity	$879.4M	$784.6M	$729.1M
YoY Change	38.49%

Cashflow Statement

Concept	2014 Q4	2014 Q3	2014 Q2
OPERATING ACTIVITIES
Net Income	$2.008M	$1.442M	$1.067M
YoY Change	1028.09%	113.95%	-37.12%
Depreciation, Depletion And Amortization	$390.0K	$310.0K	$340.0K
YoY Change	44.44%	40.91%	61.9%
Cash From Operating Activities	-$47.99M	-$17.21M	-$4.500M
YoY Change	-3099.38%	-289.12%	-366.27%
INVESTING ACTIVITIES
Capital Expenditures	-$1.030M	-$500.0K	-$1.720M
YoY Change	-73.66%	-63.5%	-49.56%
Acquisitions
YoY Change
Other Investing Activities	-$43.91M	-$29.66M	-$45.79M
YoY Change	-19.52%	-15.23%	59.38%
Cash From Investing Activities	-$44.94M	-$30.16M	-$47.51M
YoY Change	-23.14%	-17.05%	47.82%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	93.21M	51.46M	52.30M
YoY Change	31.02%	58.88%	46.42%
NET CHANGE
Cash From Operating Activities	-47.99M	-17.21M	-4.500M
Cash From Investing Activities	-44.94M	-30.16M	-47.51M
Cash From Financing Activities	93.21M	51.46M	52.30M
Net Change In Cash	280.0K	4.090M	290.0K
YoY Change	-98.04%	-20.27%	-94.5%
FREE CASH FLOW
Cash From Operating Activities	-$47.99M	-$17.21M	-$4.500M
Capital Expenditures	-$1.030M	-$500.0K	-$1.720M
Free Cash Flow	-$46.96M	-$16.71M	-$2.780M
YoY Change	-952.27%	-259.6%	-154.51%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2015Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding
CY2015Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	7305000
CY2015Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2015Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2015Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000
CY2015Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	7305213
CY2015Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	7264282
CY2014Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	103396000
CY2015Q4	istr	Other Equity Securities OtherEquitySecurities	5835000
CY2015Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	3175000
CY2014Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	3216000
CY2014Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	84213000
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	11809000
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	121000
CY2013	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	214000
CY2015	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	2189000
CY2013	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	756000
CY2015	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	35076000
CY2014	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	1628000
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	103384000
CY2013	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	21686000
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	879354000
CY2014Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	69838000
CY2014Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	22301000
CY2014Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	4630000
CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3964000
CY2014Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2014Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2014Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000
CY2014Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	7263698
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	7262085
CY2014	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	29979000
CY2014	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	1339000
CY2014	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	25066000
CY2013	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	17986000
CY2015Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	80509000
CY2014Q4	istr	Other Equity Securities OtherEquitySecurities	5566000
CY2014Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	6165000
CY2014Q4	us-gaap	Liabilities Liabilities	775970000
CY2014Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding
CY2014Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	7264000
CY2014Q4	us-gaap	Treasury Stock Value TreasuryStockValue	23000
CY2013	us-gaap	Interest Income Other InterestIncomeOther	30000
CY2014	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	305000
CY2014	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	340000
CY2013	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	449000
CY2015	istr	Gain Losses On Sales Of Foreclosed Assets GainLossesOnSalesOfForeclosedAssets	-105000
CY2014	istr	Gain Losses On Sales Of Foreclosed Assets GainLossesOnSalesOfForeclosedAssets	230000
CY2013	istr	Gain Losses On Sales Of Foreclosed Assets GainLossesOnSalesOfForeclosedAssets	97000
CY2014	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	3449000
CY2013	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2634000
CY2015	istr	Fee Income Loans Held For Sale FeeIncomeLoansHeldForSale	979000
CY2014	istr	Fee Income Loans Held For Sale FeeIncomeLoansHeldForSale	329000
CY2013	istr	Fee Income Loans Held For Sale FeeIncomeLoansHeldForSale	457000
CY2015	istr	Income Loss From Continuing Operations Before Noninterest Expense Income Taxes Extraordinary Items Noncontrolling Interests IncomeLossFromContinuingOperationsBeforeNoninterestExpenseIncomeTaxesExtraordinaryItemsNoncontrollingInterests	37937000
CY2014	istr	Income Loss From Continuing Operations Before Noninterest Expense Income Taxes Extraordinary Items Noncontrolling Interests IncomeLossFromContinuingOperationsBeforeNoninterestExpenseIncomeTaxesExtraordinaryItemsNoncontrollingInterests	30926000
CY2013	istr	Income Loss From Continuing Operations Before Noninterest Expense Income Taxes Extraordinary Items Noncontrolling Interests IncomeLossFromContinuingOperationsBeforeNoninterestExpenseIncomeTaxesExtraordinaryItemsNoncontrollingInterests	23340000
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1446000
CY2014	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1326000
CY2013	us-gaap	Depreciation And Amortization DepreciationAndAmortization	893000
CY2015	us-gaap	Labor And Related Expense LaborAndRelatedExpense	16398000
CY2014	us-gaap	Labor And Related Expense LaborAndRelatedExpense	14565000
CY2013	us-gaap	Labor And Related Expense LaborAndRelatedExpense	11772000
CY2015	us-gaap	Occupancy Net OccupancyNet	951000
CY2014	us-gaap	Occupancy Net OccupancyNet	833000
CY2013	us-gaap	Occupancy Net OccupancyNet	793000
CY2015	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1508000
CY2014	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1289000
CY2013	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	782000
CY2015	us-gaap	Marketing Expense MarketingExpense	248000
CY2014	us-gaap	Marketing Expense MarketingExpense	329000
CY2013	us-gaap	Marketing Expense MarketingExpense	320000
CY2015	us-gaap	Professional Fees ProfessionalFees	1075000
CY2014	us-gaap	Professional Fees ProfessionalFees	599000
CY2013	us-gaap	Professional Fees ProfessionalFees	295000
CY2015	istr	Investment Tax Credit Impairment Cost InvestmentTaxCreditImpairmentCost	54000
CY2014	istr	Investment Tax Credit Impairment Cost InvestmentTaxCreditImpairmentCost	690000
CY2013	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	250000
CY2015	us-gaap	Other Noninterest Expense OtherNoninterestExpense	5673000
CY2014	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4753000
CY2013	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3919000
CY2015	us-gaap	Noninterest Expense NoninterestExpense	27353000
CY2014	us-gaap	Noninterest Expense NoninterestExpense	24384000
CY2013	us-gaap	Noninterest Expense NoninterestExpense	19024000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	10584000
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	6542000
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4316000
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3511000
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1145000
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1148000
CY2015	us-gaap	Net Income Loss NetIncomeLoss	7073000
CY2014	us-gaap	Net Income Loss NetIncomeLoss	5397000
CY2013	us-gaap	Net Income Loss NetIncomeLoss	3168000
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.98
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.98
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.86
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.93
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.03
CY2014	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.04
CY2013	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.05
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-283000
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	898000
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-739000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	318000
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	224000
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	296000
CY2015	istr	Other Comprehensive Income Loss Amortization Of Unrealized Gains Losses On Security Transferred From Available For Sale Securities To Held To Maturity Net Of Tax OtherComprehensiveIncomeLossAmortizationOfUnrealizedGainsLossesOnSecurityTransferredFromAvailableForSaleSecuritiesToHeldToMaturityNetOfTax	-5000
CY2014	istr	Other Comprehensive Income Loss Amortization Of Unrealized Gains Losses On Security Transferred From Available For Sale Securities To Held To Maturity Net Of Tax OtherComprehensiveIncomeLossAmortizationOfUnrealizedGainsLossesOnSecurityTransferredFromAvailableForSaleSecuritiesToHeldToMaturityNetOfTax	-3000
CY2013	istr	Other Comprehensive Income Loss Amortization Of Unrealized Gains Losses On Security Transferred From Available For Sale Securities To Held To Maturity Net Of Tax OtherComprehensiveIncomeLossAmortizationOfUnrealizedGainsLossesOnSecurityTransferredFromAvailableForSaleSecuritiesToHeldToMaturityNetOfTax	20000
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-178000
CY2014	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-200000
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-784000
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	471000
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1015000
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	6289000
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5868000
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2153000
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-153000
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	463000
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-381000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	171000
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	116000
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	153000
CY2015	istr	Other Comprehensive Tax Expense Benefit Of Unrealized Holding Gain Loss Related To Securities Transferred From Available For Sale To Held To Maturity OtherComprehensiveTaxExpenseBenefitOfUnrealizedHoldingGainLossRelatedToSecuritiesTransferredFromAvailableForSaleToHeldToMaturity	-2000
CY2014	istr	Other Comprehensive Tax Expense Benefit Of Unrealized Holding Gain Loss Related To Securities Transferred From Available For Sale To Held To Maturity OtherComprehensiveTaxExpenseBenefitOfUnrealizedHoldingGainLossRelatedToSecuritiesTransferredFromAvailableForSaleToHeldToMaturity	-1000
CY2013	istr	Other Comprehensive Tax Expense Benefit Of Unrealized Holding Gain Loss Related To Securities Transferred From Available For Sale To Held To Maturity OtherComprehensiveTaxExpenseBenefitOfUnrealizedHoldingGainLossRelatedToSecuritiesTransferredFromAvailableForSaleToHeldToMaturity	10000
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-95000
CY2014	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-103000
CY2013	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	0
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	43553000
CY2013	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	5339000
CY2013	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	4490000
CY2013	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	23000
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	179000
CY2013	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	150000
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	55483000
CY2014	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	41728000
CY2014	istr	Stock Issued During Period Value Stock Warrants Exercised StockIssuedDuringPeriodValueStockWarrantsExercised	297000
CY2014	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	17000
CY2014	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	6000
CY2014	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	197000
CY2014	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	228000
CY2014	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	4266000
CY2015	istr	Amortization Of Purchase Accounting Adjustments AmortizationOfPurchaseAccountingAdjustments	-186000
CY2014	istr	Amortization Of Purchase Accounting Adjustments AmortizationOfPurchaseAccountingAdjustments	-366000
CY2013	istr	Amortization Of Purchase Accounting Adjustments AmortizationOfPurchaseAccountingAdjustments	-657000
CY2015	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	54000
CY2014	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	210000
CY2013	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	121000
CY2015	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1051000
CY2014	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1087000
CY2013	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-833000
CY2015	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	349684000
CY2014	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	238471000
CY2013	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	88210000
CY2015	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	376939000
CY2014	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	5142000
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-155623000
CY2015	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	109391000
CY2014	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	141893000
CY2013	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	102557000
CY2015	istr	Federal Home Loan Bank Stock Dividends FederalHomeLoanBankStockDividends	14000
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	150000
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-386000
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-134000
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	773000
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	4000
CY2014	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	3000
CY2013	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	2000
CY2015	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	396000
CY2014	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	600000
CY2013	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	365000
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	71000
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	560000
CY2015	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	8086000
CY2014	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	3615000
CY2013	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	285000
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	37516000
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	-87598000
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	15922000
CY2013	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	16626000
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	82945000
CY2014	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	55901000
CY2015	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	5622000
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	11224000
CY2014	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	10465000
CY2013	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	8530000
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	1663000
CY2014	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	385000
CY2014	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	105241000
CY2013	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	828000
CY2014	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	5509000
CY2013	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	1312000
CY2015	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	124041000
CY2014	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	223132000
CY2013	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	197974000
CY2015	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	2857000
CY2014	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1506000
CY2013	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1642000
CY2015	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	696000
CY2014	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	3000
CY2013	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	1306000
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	4079000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	66284000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	736000
CY2014Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	37
CY2015Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	13289000
CY2014Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	6157000
CY2014Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	223000
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-151331000
CY2013	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	9389000
CY2013	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	9293000
CY2014	us-gaap	Payments To Acquire Limited Partnership Interests PaymentsToAcquireLimitedPartnershipInterests	766000
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-173314000
CY2014	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	95648000
CY2013	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	146632000
CY2015	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	26807000
CY2014	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	2089000
CY2013	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	6169000
CY2015	istr	Increase Decrease Of Short Term Federal Home Loan Bank Advances IncreaseDecreaseOfShortTermFederalHomeLoanBankAdvances	13141000
CY2014	istr	Increase Decrease Of Short Term Federal Home Loan Bank Advances IncreaseDecreaseOfShortTermFederalHomeLoanBankAdvances	90639000
CY2013	istr	Increase Decrease Of Short Term Federal Home Loan Bank Advances IncreaseDecreaseOfShortTermFederalHomeLoanBankAdvances	-12120000
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3000000
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	7500000
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	20700000
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	14429000
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	3171000
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7557000
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	221000
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	194000
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	169000
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	572000
CY2014	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6000
CY2014	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	41728000
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	5339000
CY2015	istr	Proceeds From Stock Options And Warrants Exercised ProceedsFromStockOptionsAndWarrantsExercised	135000
CY2014	istr	Proceeds From Stock Options And Warrants Exercised ProceedsFromStockOptionsAndWarrantsExercised	297000
CY2013	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	23000
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	137252000
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	234530000
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	158971000
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1454000
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-8691000
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	23562000
CY2013Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	28203000
CY2012Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	4641000
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	4000000
CY2014	us-gaap	Income Taxes Paid IncomeTaxesPaid	1336000
CY2013	us-gaap	Income Taxes Paid IncomeTaxesPaid	1727000
CY2015	us-gaap	Interest Paid InterestPaid	5833000
CY2014	us-gaap	Interest Paid InterestPaid	4675000
CY2013	us-gaap	Interest Paid InterestPaid	3301000
CY2015	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1005000
CY2014	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	706000
CY2013	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1287000
CY2013	us-gaap	Mortgage Loan Related To Property Sales1 MortgageLoanRelatedToPropertySales1	100000
CY2014Q4	istr	Financing Receivable Recorded Investment Past Due And Nonaccrual Status FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus	3927000
CY2014Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	618863000
CY2013	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	762000
CY2013Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	136000
CY2013Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	133000
CY2013Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	37000
CY2013	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	138000
CY2013	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	5000
CY2015	us-gaap	Use Of Estimates UseOfEstimates	<div> <p style="text-align:justify;margin-bottom:0pt;margin-top:18pt;text-indent:0%;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Use of Estimates </p> <p style="text-align:justify;margin-bottom:0pt;margin-top:6pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">The preparation of statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates, and such differences could be material. </p> <p style="text-align:justify;margin-bottom:0pt;margin-top:12pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan losses. Such agencies may require the Company to recognize additions to the allowance based on their judgments about information available to them at the time of their examination. Because of these factors, it is reasonably possible that the allowance for loan losses may change materially in the near term. However, the amount of the change that is reasonably possible cannot be estimated. </p> <p style="text-align:justify;margin-bottom:0pt;margin-top:12pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Other estimates that are susceptible to significant change in the near term relate to the determination of other-than-temporary impairments of securities and the fair value of financial instruments. </p></div>
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.33
CY2014	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	14.00
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.94
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	15.74
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	14.00
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	13.33
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	14.37
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y5M1D
CY2013	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	0
CY2015	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div> <p style="text-align:justify;margin-bottom:0pt;margin-top:18pt;text-indent:0%;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Reclassifications </p> <p style="text-align:justify;margin-bottom:0pt;margin-top:6pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Certain reclassifications have been made to the 2014 and 2013 financial statements to be consistent with the 2015 presentation. </p></div>
CY2013	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	44000
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.261
CY2013Q4	istr	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividend DeferredTaxLiabilitiesFederalHomeLoanBankStockDividend	30000
CY2015	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1
CY2015	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0
CY2015	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	200000
CY2014	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	300000
CY2013	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	300000
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	279000
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	736000
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	600000
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	139000
CY2015Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	23000
CY2015Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	160000
CY2014Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	5000
CY2014Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	223000
CY2015Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	144
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	62334000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	666000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	70000
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	6192000
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	53000
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	6187000
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	86000
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	12379000
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	139000
CY2015Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	78000
CY2015Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	3897000
CY2015Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	82000
CY2015Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	17186000
CY2015Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	160000
CY2014Q4	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	5
CY2014Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	6157000
CY2014Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	223000
CY2015Q4	istr	Available For Sale Securities Debt Maturities After One Through Five Years Fully Taxable Equivalent Yield AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFullyTaxableEquivalentYield	0.0201
CY2015Q4	istr	Available For Sale Securities Debt Maturities After Five Through Ten Years Fully Taxable Equivalent Yield AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFullyTaxableEquivalentYield	0.0281
CY2015Q4	istr	Available For Sale Securities Debt Maturities After Ten Years Fully Taxable Equivalent Yield AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFullyTaxableEquivalentYield	0.0263
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	9979000
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	23662000
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	79003000
CY2015Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	112644000
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	9984000
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	23494000
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	78801000
CY2015Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	112279000
CY2015Q4	istr	Held To Maturity Securities Debt Maturities Within One Year Fully Taxable Equivalent Yield HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFullyTaxableEquivalentYield	0.0717
CY2015Q4	istr	Held To Maturity Securities Debt Maturities After One Through Five Years Fully Taxable Equivalent Yield HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFullyTaxableEquivalentYield	0.0717
CY2015Q4	istr	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fully Taxable Equivalent Yield HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFullyTaxableEquivalentYield	0.0717
CY2015Q4	istr	Held To Maturity Securities Debt Maturities After Ten Years Fully Taxable Equivalent Yield HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFullyTaxableEquivalentYield	0.0317
CY2015Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	655000
CY2015Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	2950000
CY2015Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	3575000
CY2015Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	19228000
CY2015Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	657000
CY2014Q4	istr	Available For Sale Securities Debt Maturities After Five Through Ten Years Fully Taxable Equivalent Yield AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFullyTaxableEquivalentYield	0.0248
CY2014Q4	istr	Available For Sale Securities Debt Maturities After Ten Years Fully Taxable Equivalent Yield AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFullyTaxableEquivalentYield	0.0233
CY2014Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	100000
CY2015Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	3584000
CY2015Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	19072000
CY2015Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2958000
CY2014Q4	istr	Available For Sale Securities Debt Maturities Within One Year Fully Taxable Equivalent Yield AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFullyTaxableEquivalentYield	0.0121
CY2014Q4	istr	Available For Sale Securities Debt Maturities After One Through Five Years Fully Taxable Equivalent Yield AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFullyTaxableEquivalentYield	0.0166
CY2015	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	263000
CY2014Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	14719000
CY2014Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	620000
CY2014Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2815000
CY2014Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	4365000
CY2014Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	14501000
CY2015Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	745441000
CY2014	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	81000
CY2013	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	21000
CY2014Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	622790000
CY2015Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	2411000
CY2015Q4	istr	Financing Receivable Recorded Investment Past Due And Nonaccrual Status FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus	5038000
CY2015Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	740403000
CY2014Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	3340000
CY2014Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	1871000
CY2014Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	17324000
CY2014Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	49991000
CY2014Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	69286000
CY2014Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	100000
CY2014Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	1868000
CY2014Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	17433000
CY2014Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	50364000
CY2014Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	69765000
CY2014Q4	istr	Held To Maturity Securities Debt Maturities Within One Year Fully Taxable Equivalent Yield HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFullyTaxableEquivalentYield	0.0707
CY2014Q4	istr	Held To Maturity Securities Debt Maturities After One Through Five Years Fully Taxable Equivalent Yield HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFullyTaxableEquivalentYield	0.0707
CY2014Q4	istr	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fully Taxable Equivalent Yield HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFullyTaxableEquivalentYield	0.0707
CY2014Q4	istr	Held To Maturity Securities Debt Maturities After Ten Years Fully Taxable Equivalent Yield HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFullyTaxableEquivalentYield	0.0331
CY2014Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	620000
CY2014Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	2815000
CY2014Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	4365000
CY2015Q4	istr	Loan Participations And Whole Loans Sold To And Serviced For Others Not On Balance Sheet LoanParticipationsAndWholeLoansSoldToAndServicedForOthersNotOnBalanceSheet	383700000
CY2014Q4	istr	Loan Participations And Whole Loans Sold To And Serviced For Others Not On Balance Sheet LoanParticipationsAndWholeLoansSoldToAndServicedForOthersNotOnBalanceSheet	189600000
CY2015Q4	istr	Loan Participations And Whole Loans Sold To And Serviced For Others Unpaid Principal Balance LoanParticipationsAndWholeLoansSoldToAndServicedForOthersUnpaidPrincipalBalance	426900000
CY2014Q4	istr	Loan Participations And Whole Loans Sold To And Serviced For Others Unpaid Principal Balance LoanParticipationsAndWholeLoansSoldToAndServicedForOthersUnpaidPrincipalBalance	218600000
CY2015Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	17992000
CY2014Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	14631000
CY2013Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	11781000
CY2015	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	6600000
CY2014	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	6793000
CY2015	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	3239000
CY2014	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	3943000
CY2013Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	270000
CY2014	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	316000
CY2014	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	161000
CY2014Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	425000
CY2015	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	110000
CY2015	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	140000
CY2015Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	395000
CY2014Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	4630000
CY2013Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	3380000
CY2015	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	630000
CY2014	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	459000
CY2013	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	389000
CY2015Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	6128000
CY2015Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	4045000
CY2015Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	741396000
CY2014Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	70000
CY2014Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	4560000
CY2014Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	3568000
CY2014Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	619222000
CY2013Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	37000
CY2013Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	3343000
CY2013Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	4510000
CY2013Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	499585000
CY2013Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	504095000
CY2015Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	3450000
CY2015Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	3445000
CY2015	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	4047000
CY2015	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	189000
CY2015Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	595000
CY2015Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	595000
CY2015Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	220000
CY2015	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	210000
CY2015	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	15000
CY2015Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	4040000
CY2015	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	4257000
CY2015	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	204000
CY2014Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	3387000
CY2014Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	3386000
CY2014	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	3603000
CY2014	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	106000
CY2014Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	180000
CY2014Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	180000
CY2014Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	70000
CY2014	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	179000
CY2014	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	4000
CY2014Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	3568000
CY2014Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	3566000
CY2014	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	3782000
CY2014	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	110000
CY2013Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	4374000
CY2013Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	4079000
CY2013	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	4132000
CY2013Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	4510000
CY2013Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	4212000
CY2013	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	4270000
CY2013	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	767000
CY2015	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	11
CY2015Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	2175000
CY2014Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	581000
CY2015	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1639000
CY2015	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1639000
CY2014	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	581000
CY2014	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	581000
CY2015	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0
CY2013Q4	us-gaap	Foreclosed Assets ForeclosedAssets	3515000
CY2015	istr	Other Real Estate Owned Transfers From Non Acquired Loans OtherRealEstateOwnedTransfersFromNonAcquiredLoans	950000
CY2015	istr	Other Real Estate Owned Transfers From Acquired Loans OtherRealEstateOwnedTransfersFromAcquiredLoans	55000
CY2014	istr	Other Real Estate Owned Transfers From Acquired Loans OtherRealEstateOwnedTransfersFromAcquiredLoans	706000
CY2015	istr	Other Real Estate Owned Other Real Estate Sold OtherRealEstateOwnedOtherRealEstateSold	2961000
CY2014	istr	Other Real Estate Owned Other Real Estate Sold OtherRealEstateOwnedOtherRealEstateSold	1276000
CY2015	istr	Other Real Estate Owned Write Downs OtherRealEstateOwnedWriteDowns	54000
CY2014	istr	Other Real Estate Owned Write Downs OtherRealEstateOwnedWriteDowns	210000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	617000
CY2014Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	617000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	126000
CY2014Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	85000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	491000
CY2014Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	532000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	41000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	41000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	41000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	41000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	41000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	41000
CY2015Q4	us-gaap	Interest Bearing Domestic Deposit Negotiable Order Of Withdrawal Now InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW	140503000
CY2014Q4	us-gaap	Interest Bearing Domestic Deposit Negotiable Order Of Withdrawal Now InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW	116644000
CY2015Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	96113000
CY2014Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	77589000
CY2015Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	53735000
CY2014Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	53332000
CY2015Q4	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	356608000
CY2014Q4	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	310336000
CY2015Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	321804000
CY2014Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	263472000
CY2015Q4	istr	Time Deposits100000 To249999 TimeDeposits100000To249999	13395000
CY2014Q4	istr	Time Deposits100000 To249999 TimeDeposits100000To249999	13714000
CY2015Q4	istr	Time Deposits250000 And Above TimeDeposits250000AndAbove	21409000
CY2014Q4	istr	Time Deposits250000 And Above TimeDeposits250000AndAbove	33150000
CY2015Q4	us-gaap	Time Deposits TimeDeposits	356608000
CY2014Q4	us-gaap	Time Deposits TimeDeposits	310336000
CY2015Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess	4675000
CY2014Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess	24193000
CY2015Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths	10039000
CY2014Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths	4788000
CY2015Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months	12912000
CY2014Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months	7825000
CY2015Q4	istr	Contractual Maturities Time Deposits100000 Or More One Year Through Three Years ContractualMaturitiesTimeDeposits100000OrMoreOneYearThroughThreeYears	5710000
CY2014Q4	istr	Contractual Maturities Time Deposits100000 Or More One Year Through Three Years ContractualMaturitiesTimeDeposits100000OrMoreOneYearThroughThreeYears	8549000
CY2015Q4	istr	Contractual Maturities Time Deposits100000 Or More After Three Years ContractualMaturitiesTimeDeposits100000OrMoreAfterThreeYears	1468000
CY2014Q4	istr	Contractual Maturities Time Deposits100000 Or More After Three Years ContractualMaturitiesTimeDeposits100000OrMoreAfterThreeYears	1509000
CY2015Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	34804000
CY2014Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	46864000
CY2015Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	191896000
CY2015Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	123308000
CY2015Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	20504000
CY2015Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	13186000
CY2015Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	7714000
CY2015Q4	istr	Deposits Public Funds Amount DepositsPublicFundsAmount	17500000
CY2014Q4	istr	Deposits Public Funds Amount DepositsPublicFundsAmount	6900000
CY2015Q4	us-gaap	Security Owned And Pledged As Collateral Fair Value SecurityOwnedAndPledgedAsCollateralFairValue	16900000
CY2014Q4	us-gaap	Security Owned And Pledged As Collateral Fair Value SecurityOwnedAndPledgedAsCollateralFairValue	7100000
CY2015Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	28100000
CY2014Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	48900000
CY2015Q4	us-gaap	Securities Sold Under Agreements To Repurchase Fair Value Of Collateral SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	41900000
CY2014Q4	us-gaap	Securities Sold Under Agreements To Repurchase Fair Value Of Collateral SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	12700000
CY2015Q4	us-gaap	Assets Sold Under Agreements To Repurchase Interest Rate AssetsSoldUnderAgreementsToRepurchaseInterestRate	0.0020
CY2014Q4	us-gaap	Assets Sold Under Agreements To Repurchase Interest Rate AssetsSoldUnderAgreementsToRepurchaseInterestRate	0.0020
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	119137000
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	4160000
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	1100000
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	3100000
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0040
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0097
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Two To Three Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate	0.0100
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Three To Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate	0.0152
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Weighted Average Interest Rate FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate	0.0045
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	104339000
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	15534000
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	4712000
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	850000
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Four To Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate	350000
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0016
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0075
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Two To Three Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate	0.0096
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Three To Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate	0.0093
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Four To Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate	0.0150
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Weighted Average Interest Rate FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate	0.0027
CY2015Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	174100000
CY2015Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	35000000
CY2015Q4	us-gaap	Line Of Credit LineOfCredit	0
CY2015	us-gaap	Maximum Length Of Time Hedged In Interest Rate Cash Flow Hedge1 MaximumLengthOfTimeHedgedInInterestRateCashFlowHedge1	P4Y6M
CY2015Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	30000000
CY2015	us-gaap	Derivative Instruments Loss Recognized In Other Comprehensive Income Effective Portion DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion	200000
CY2014	us-gaap	Derivative Instruments Loss Recognized In Other Comprehensive Income Effective Portion DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion	200000
CY2013	us-gaap	Derivative Instruments Loss Recognized In Other Comprehensive Income Effective Portion DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion	0
CY2015	us-gaap	Derivative Instruments Gain Loss Reclassification From Accumulated Oci To Income Estimated Net Amount To Be Transferred DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred	-400000
CY2015Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	3210816
CY2013Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	3945114
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	30311
CY2013	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	7500
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	22811
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	216000
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	238811
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	64333
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	14667
CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	10125
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	278352
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	47351
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.33
CY2013	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	13.33
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	13.82
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y10M17D
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y10M17D
CY2014	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y11M16D
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P7Y
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	900000
CY2015Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	200000
CY2015	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	200000
CY2014	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	100000
CY2015Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	700000
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0017
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0036
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.1848
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.1901
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0179
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0217
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P7Y
CY2014	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P7Y
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.75
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.44
CY2015	istr	Minimum Service Period For Participation In Defined Benefit Plan MinimumServicePeriodForParticipationInDefinedBenefitPlan	P90D
CY2015	istr	Defined Contribution Plan Employers Discretionary Contribution Annual Vesting Percentage DefinedContributionPlanEmployersDiscretionaryContributionAnnualVestingPercentage	0.20
CY2015	istr	Defined Contribution Plan Employer Discretionary Contribution Amount Award Vesting Period DefinedContributionPlanEmployerDiscretionaryContributionAmountAwardVestingPeriod	P5Y
CY2015	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	400000
CY2014	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	400000
CY2013	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	200000
CY2015Q4	istr	Deferred Compensation Arrangement With Individual Monthly Distribution DeferredCompensationArrangementWithIndividualMonthlyDistribution	2000
CY2015	istr	Deferred Compensation Arrangement Maximum Contractual Term DeferredCompensationArrangementMaximumContractualTerm	2020
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3897000
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1279000
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	375000
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.34
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.34
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3704000
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	2224000
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1468000
CY2015	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	142000
CY2014	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	118000
CY2013	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	112000
CY2013	istr	Income Tax Reconciliation Purchase Accounting Adjustment IncomeTaxReconciliationPurchaseAccountingAdjustment	-300000
CY2013	istr	Income Tax Reconciliation Acquisition Costs IncomeTaxReconciliationAcquisitionCosts	48000
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	62000
CY2014	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1002000
CY2015	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	11000
CY2014	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	41000
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.332
CY2014	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.175
CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1402000
CY2014Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1435000
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1303000
CY2015Q4	istr	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividend DeferredTaxLiabilitiesFederalHomeLoanBankStockDividend	5000
CY2014Q4	istr	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividend DeferredTaxLiabilitiesFederalHomeLoanBankStockDividend	16000
CY2015Q4	istr	Deferred Tax Liabilities Basis Difference In Acquired Assets And Liabilities DeferredTaxLiabilitiesBasisDifferenceInAcquiredAssetsAndLiabilities	26000
CY2014Q4	istr	Deferred Tax Liabilities Unrealized Gains Losses On Available For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsLossesOnAvailableForSaleSecurities	62000
CY2015Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1433000
CY2014Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1513000
CY2013Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1333000
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	1588000
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	879000
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	377000
CY2015Q4	istr	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Other Real Estate Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForOtherRealEstateLosses	328000
CY2014Q4	istr	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Other Real Estate Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForOtherRealEstateLosses	517000
CY2013Q4	istr	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Other Real Estate Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForOtherRealEstateLosses	544000
CY2015Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	357000
CY2013Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	180000
CY2015Q4	istr	Deferred Tax Assets Unamortized Start Up Cost DeferredTaxAssetsUnamortizedStartUpCost	147000
CY2014Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2610000
CY2013Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2538000
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1205000
CY2015Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	1200000
CY2014Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	1800000
CY2015	istr	Short Term Debt Maturity Period ShortTermDebtMaturityPeriod	P90D
CY2015	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	11531000
CY2014Q4	istr	Deferred Tax Assets Unamortized Start Up Cost DeferredTaxAssetsUnamortizedStartUpCost	165000
CY2013Q4	istr	Deferred Tax Assets Unamortized Start Up Cost DeferredTaxAssetsUnamortizedStartUpCost	187000
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	412000
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	617000
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	833000
CY2015Q4	istr	Deferred Tax Assets Deferred Gain On Sale Of Other Real Estate DeferredTaxAssetsDeferredGainOnSaleOfOtherRealEstate	35000
CY2013Q4	istr	Deferred Tax Assets Deferred Gain On Sale Of Other Real Estate DeferredTaxAssetsDeferredGainOnSaleOfOtherRealEstate	90000
CY2014Q4	istr	Deferred Tax Assets Basis Difference In Acquired Assets And Liabilities DeferredTaxAssetsBasisDifferenceInAcquiredAssetsAndLiabilities	46000
CY2013Q4	istr	Deferred Tax Assets Basis Difference In Acquired Assets And Liabilities DeferredTaxAssetsBasisDifferenceInAcquiredAssetsAndLiabilities	180000
CY2015Q4	istr	Deferred Tax Assets Historical Tax Credit DeferredTaxAssetsHistoricalTaxCredit	247000
CY2014Q4	istr	Deferred Tax Assets Historical Tax Credit DeferredTaxAssetsHistoricalTaxCredit	226000
CY2015Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	234000
CY2014Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	160000
CY2013Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	147000
CY2015Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	3348000
CY2015Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	11531000
CY2015Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	0
CY2014Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	0
CY2013Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	0
CY2015	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	0
CY2015Q4	us-gaap	Liabilities Fair Value Disclosure Nonrecurring LiabilitiesFairValueDisclosureNonrecurring	0
CY2014Q4	us-gaap	Liabilities Fair Value Disclosure Nonrecurring LiabilitiesFairValueDisclosureNonrecurring	0
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	20785000
CY2015Q4	us-gaap	Investments Investments	139779000
CY2015Q4	istr	Federal Home Loan Bank Advances Short Term And Repurchase Agreements FederalHomeLoanBankAdvancesShortTermAndRepurchaseAgreements	158236000
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	8360000
CY2015Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	581000
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	19012000
CY2014Q4	us-gaap	Investments Investments	92818000
CY2014Q4	istr	Federal Home Loan Bank Advances Short Term And Repurchase Agreements FederalHomeLoanBankAdvancesShortTermAndRepurchaseAgreements	116632000
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	21446000
CY2014Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	303000
CY2015Q4	istr	Risk Based Capital Ratio Required For Capital Adequacy RiskBasedCapitalRatioRequiredForCapitalAdequacy	0.080
CY2015Q4	istr	Tier One Risk Based Capital Ratio Required For Capital Adequacy TierOneRiskBasedCapitalRatioRequiredForCapitalAdequacy	0.060
CY2015Q4	istr	Common Equity Tier One Capital Ratio Required For Capital Adequacy CommonEquityTierOneCapitalRatioRequiredForCapitalAdequacy	0.045
CY2015Q4	istr	Tier One Leverage Capital Ratio Required For Capital Adequacy TierOneLeverageCapitalRatioRequiredForCapitalAdequacy	0.040
CY2015Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	149900000
CY2014Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	91500000
CY2015Q4	istr	Commitment To Fund Investment In Sbic Qualified Funds CommitmentToFundInvestmentInSBICQualifiedFunds	900000
CY2015Q4	istr	Average Reserve Balance Maintained With Federal Reserve Bank AverageReserveBalanceMaintainedWithFederalReserveBank	12700000
CY2014Q4	istr	Average Reserve Balance Maintained With Federal Reserve Bank AverageReserveBalanceMaintainedWithFederalReserveBank	12900000
CY2014Q3	istr	Area Of Building AreaOfBuilding	2240
CY2014	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	498000
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	7214045
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	5533514
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	3667929
CY2015	istr	Incremental Common Shares Attributable To Restricted Stock IncrementalCommonSharesAttributableToRestrictedStock	5861
CY2015Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	7952000
CY2015Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	8227000
CY2015Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	700000
CY2014	istr	Incremental Common Shares Attributable To Restricted Stock IncrementalCommonSharesAttributableToRestrictedStock	41467
CY2013	istr	Incremental Common Shares Attributable To Restricted Stock IncrementalCommonSharesAttributableToRestrictedStock	32141
CY2015	istr	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	21150
CY2014	istr	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	22811
CY2013	istr	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	29773
CY2015	istr	Incremental Common Shares Attributable To Warrants IncrementalCommonSharesAttributableToWarrants	16952
CY2014	istr	Incremental Common Shares Attributable To Warrants IncrementalCommonSharesAttributableToWarrants	179510
CY2013	istr	Incremental Common Shares Attributable To Warrants IncrementalCommonSharesAttributableToWarrants	193532
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	7258008
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	5777302
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	3923375
CY2015Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	8800000
CY2015Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	9187000
CY2015Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	9480000
CY2015Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	9873000
CY2015Q1	us-gaap	Interest Expense InterestExpense	1301000
CY2015Q2	us-gaap	Interest Expense InterestExpense	1407000
CY2015Q3	us-gaap	Interest Expense InterestExpense	1528000
CY2015Q4	us-gaap	Interest Expense InterestExpense	1646000
CY2015Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	7499000
CY2015Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	7780000
CY2015Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	400000
CY2015Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	400000
CY2015Q4	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	365000
CY2015Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	6799000
CY2015Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	7380000
CY2015Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	7552000
CY2015Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	7862000
CY2015Q1	us-gaap	Noninterest Income NoninterestIncome	2540000
CY2015Q2	us-gaap	Noninterest Income NoninterestIncome	2066000
CY2015Q3	us-gaap	Noninterest Income NoninterestIncome	2167000
CY2015Q4	us-gaap	Noninterest Income NoninterestIncome	1571000
CY2015Q1	us-gaap	Noninterest Expense NoninterestExpense	6424000
CY2015Q2	us-gaap	Noninterest Expense NoninterestExpense	6682000
CY2015Q3	us-gaap	Noninterest Expense NoninterestExpense	7013000
CY2015Q4	us-gaap	Noninterest Expense NoninterestExpense	7234000
CY2015Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2915000
CY2015Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2764000
CY2015Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2706000
CY2015Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2199000
CY2015Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	965000
CY2015Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	951000
CY2015Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	850000
CY2015Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	745000
CY2015Q1	us-gaap	Net Income Loss NetIncomeLoss	1950000
CY2015Q2	us-gaap	Net Income Loss NetIncomeLoss	1813000
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	1856000
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	1454000
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2014Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	7577000
CY2014Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	245000
CY2014Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	448000
CY2014Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	505000
CY2014Q4	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	430000
CY2014Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	5622000
CY2014Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	5801000
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2014Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	6957000
CY2014Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	7407000
CY2014Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	8182000
CY2014Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	8822000
CY2014Q1	us-gaap	Interest Expense InterestExpense	1090000
CY2014Q2	us-gaap	Interest Expense InterestExpense	1158000
CY2014Q3	us-gaap	Interest Expense InterestExpense	1182000
CY2014Q4	us-gaap	Interest Expense InterestExpense	1245000
CY2014Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	5867000
CY2014Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	6249000
CY2014Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	7000000
CY2014Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	6495000
CY2014Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	7147000
CY2014Q1	us-gaap	Noninterest Income NoninterestIncome	1066000
CY2014Q2	us-gaap	Noninterest Income NoninterestIncome	1509000
CY2014Q3	us-gaap	Noninterest Income NoninterestIncome	1959000
CY2014Q4	us-gaap	Noninterest Income NoninterestIncome	1325000
CY2014Q1	us-gaap	Noninterest Expense NoninterestExpense	5385000
CY2014Q2	us-gaap	Noninterest Expense NoninterestExpense	5729000
CY2014Q3	us-gaap	Noninterest Expense NoninterestExpense	6313000
CY2014Q4	us-gaap	Noninterest Expense NoninterestExpense	6955000
CY2014Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1303000
CY2014Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1581000
CY2014Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2141000
CY2014Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1517000
CY2014Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	424000
CY2014Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	514000
CY2014Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	699000
CY2014Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-491000
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	879000
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	1067000
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	1442000
CY2014Q4	us-gaap	Net Income Loss NetIncomeLoss	2008000
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.28
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27

Files In Submission

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$ISTR
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2014 Q4 Form 10-K Financial Statement

#000156459016014510 Filed on March 11, 2016

Income Statement

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$ISTR Investar Holding Corp Stock $istr

2014 Q4 Form 10-K Financial Statement

#000156459016014510 Filed on March 11, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ISTR
Investar Holding Corp Stock $istr