$OSBC
Old Second Bancorp Inc Stock $osbc

$osbc Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-Q Financial Statement

#000110465912077704 Filed on November 14, 2012

Income Statement

Concept	2012 Q4	2012 Q3	2011 Q3
Revenue		$18.33M	$21.05M
YoY Change		-12.89%
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	$1.260M	$1.180M	$1.290M
YoY Change	20.0%	-8.53%	-8.51%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$3.698M	$5.123M
YoY Change		-27.82%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$1.520M	$120.0K	-$1.390M
YoY Change	-150.67%	-108.63%	13.93%
Income Tax	$0.00	$0.00	$0.00
% Of Pretax Income	0.0%	0.0%
Net Earnings	$1.520M	$120.0K	-$1.390M
YoY Change	-150.67%	-108.63%	1444.44%
Net Earnings / Revenue		0.65%	-6.6%
Basic Earnings Per Share		-$0.08	-$0.18
Diluted Earnings Per Share	$108.0K	-$0.08	-$0.18
COMMON SHARES
Basic Shares Outstanding	14.08M shares	14.08M shares	14.03M shares
Diluted Shares Outstanding		14.21M shares	14.22M shares

Balance Sheet

Concept	2012 Q4	2012 Q3	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents
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	$47.00M	$48.51M	$52.00M
YoY Change	-6.88%	-6.71%	-6.47%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$900.0K
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.046B	$1.903B	$1.941B
YoY Change	5.38%	-1.92%	-15.54%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$117.9M	$1.700M	$6.900M
YoY Change	13000.0%	-75.36%	-35.51%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$117.9M	$1.700M	$6.900M
YoY Change	13000.0%	-75.36%	-35.51%
LONG-TERM LIABILITIES
Long-Term Debt	$103.9M	$103.9M	$103.9M
YoY Change	0.0%	0.0%	0.0%
Other Long-Term Liabilities	$34.30M	$30.10M	$23.60M
YoY Change	56.62%	27.54%	22.92%
Total Long-Term Liabilities	$138.2M	$134.0M	$127.5M
YoY Change	9.86%	5.1%	3.57%
TOTAL LIABILITIES
Total Short-Term Liabilities	$117.9M	$1.700M	$6.900M
Total Long-Term Liabilities	$138.2M	$134.0M	$127.5M
Total Liabilities	$1.973B	$1.833B	$1.862B
YoY Change	5.67%	-1.6%	-12.82%
SHAREHOLDERS EQUITY
Retained Earnings	$12.05M	$11.80M
YoY Change	-29.57%
Common Stock	$18.73M	$18.73M
YoY Change	0.54%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$94.96M	$94.96M
YoY Change	0.07%
Treasury Stock Shares	4.645M shares	4.645M shares	4.593M shares
Shareholders Equity	$72.55M	$70.74M	$78.28M
YoY Change
Total Liabilities & Shareholders Equity	$2.046B	$1.903B	$1.941B
YoY Change	5.38%	-1.92%	-15.54%

Cashflow Statement

Concept	2012 Q4	2012 Q3	2011 Q3
OPERATING ACTIVITIES
Net Income	$1.520M	$120.0K	-$1.390M
YoY Change	-150.67%	-108.63%	1444.44%
Depreciation, Depletion And Amortization	$1.260M	$1.180M	$1.290M
YoY Change	20.0%	-8.53%	-8.51%
Cash From Operating Activities	$14.62M	$10.77M	$9.360M
YoY Change	69.8%	15.06%	6.85%
INVESTING ACTIVITIES
Capital Expenditures	-$680.0K	-$70.00K	-$290.0K
YoY Change	119.35%	-75.86%	31.82%
Acquisitions
YoY Change
Other Investing Activities	-$94.11M	$16.67M	$33.36M
YoY Change	29.4%	-50.03%	-65.04%
Cash From Investing Activities	-$94.78M	$16.60M	$33.07M
YoY Change	29.76%	-49.8%	-65.26%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	136.4M	-85.15M	-39.55M
YoY Change	1933.08%	115.3%	-75.89%
NET CHANGE
Cash From Operating Activities	14.62M	10.77M	9.360M
Cash From Investing Activities	-94.78M	16.60M	33.07M
Cash From Financing Activities	136.4M	-85.15M	-39.55M
Net Change In Cash	56.26M	-57.78M	2.880M
YoY Change	-197.47%	-2106.25%	-104.79%
FREE CASH FLOW
Cash From Operating Activities	$14.62M	$10.77M	$9.360M
Capital Expenditures	-$680.0K	-$70.00K	-$290.0K
Free Cash Flow	$15.30M	$10.84M	$9.650M
YoY Change	71.52%	12.33%	7.46%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	7000000	USD
CY2011	osbc	Increase Decrease In Federal Home Loan Bank Stock IncreaseDecreaseInFederalHomeLoanBankStock	-2300000	USD
CY2012Q3	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	4800000	USD
CY2011Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	4800000	USD
CY2012Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	416691000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	313858000	USD
CY2012Q3	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	5934000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	3775000	USD
CY2012Q3	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	10279000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	10069000	USD
CY2012Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	412346000	USD
CY2011Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	307564000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	9962000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	39755000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	12190000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	34196000	USD
CY2012Q3	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Amortized Cost Basis AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis	96103000	USD
	osbc	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsWeightedAverageYield	0.0220	pure
	osbc	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveWeightedAverageYield	0.0188	pure
	osbc	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenWeightedAverageYield	0.0343	pure
	osbc	Available For Sale Securities Debt Maturities Rolling After Year Ten Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenWeightedAverageYield	0.0385	pure
	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Weighted Average Yield AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateWeightedAverageYield	0.0281	pure
CY2012Q3	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	2	security
	osbc	Available For Sale Securities Weighted Average Yield AvailableForSaleSecuritiesWeightedAverageYield	0.0206	pure
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CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	40543000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	13051000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	34341000	USD
CY2012Q3	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Fair Value AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue	97988000	USD
CY2012Q3	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	22	security
CY2011Q4	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	22	security
CY2011Q4	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	2	security
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CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	10069000	USD
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CY2011Q3	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1288250000	USD
CY2012Q3	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	211452000	USD
CY2012Q3	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	265215000	USD
CY2012Q3	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	321614000	USD
CY2012Q3	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	323464000	USD
CY2012Q3	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	194078000	USD
CY2012Q3	us-gaap	Deposits Deposits	1696934000	USD
CY2011Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	361963000	USD
CY2011Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	196870000	USD
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	dei	Entity Registrant Name EntityRegistrantName	OLD SECOND BANCORP INC
	dei	Entity Central Index Key EntityCentralIndexKey	0000357173
	dei	Document Type DocumentType	10-Q
	dei	Document Period End Date DocumentPeriodEndDate	2012-09-30
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Filer Category EntityFilerCategory	Smaller Reporting Company
CY2012Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	14084328	shares
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
CY2011Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	2692000	USD
CY2011Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	48257000	USD
CY2011Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	50949000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	14050000	USD
CY2011Q4	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	12806000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1316988000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	50477000	USD
CY2011Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	93290000	USD
CY2011Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3487000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	4678000	USD
CY2011Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	52595000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	34534000	USD
CY2011Q4	us-gaap	Assets Assets	1941418000	USD
CY2011Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	761335000	USD
CY2011Q4	us-gaap	Time Deposits TimeDeposits	617483000	USD
CY2011Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	901000	USD
CY2011Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	58378000	USD
CY2011Q4	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2011Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	21856000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	1867416000	USD
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue	70863000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	18628000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	65999000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	17107000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3702000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	94893000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	74002000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1941418000	USD
CY2012Q3	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	72241000	USD
CY2012Q3	us-gaap	Preferred Stock Value PreferredStockValue	71611000	USD
CY2012Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1903400000	USD
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2012Q3	us-gaap	Interest Expense InterestExpense	3698000	USD
CY2011Q3	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	1060000	USD
CY2011Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	297000	USD
CY2012Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	14635000	USD
CY2011Q3	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	1314000	USD
CY2011Q3	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-63000	USD
CY2011Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	233000	USD
CY2011Q3	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	775000	USD
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	73000	shares
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	18627858	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	14034991	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	4592867	shares
CY2012Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2012Q3	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2012Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2012Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2012Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	73000	shares
CY2012Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2012Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2012Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	18729134	shares
CY2012Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	14084328	shares
CY2012Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	4644806	shares
CY2012Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	18333000	USD
CY2012Q3	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	1000	USD
CY2012Q3	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	29000	USD
CY2012Q3	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1243000	USD
CY2012Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	14635000	USD
CY2012Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	8963000	USD
CY2012Q3	us-gaap	Noninterest Expense NoninterestExpense	24863000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	120000	USD
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	120000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1135000	USD
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.08
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.08
CY2012Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.00
CY2011Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	19800000	USD
CY2011Q3	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	72000	USD
CY2011Q3	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	928000	USD
CY2011Q3	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	114000	USD
CY2011Q3	us-gaap	Dividend Income Operating DividendIncomeOperating	73000	USD
CY2011Q3	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	58000	USD
CY2011Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	21045000	USD
CY2011Q3	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	327000	USD
CY2011Q3	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	3436000	USD
CY2011Q3	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1155000	USD
CY2011Q3	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	201000	USD
CY2011Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	4000	USD
CY2011Q3	us-gaap	Interest Expense InterestExpense	5123000	USD
CY2011Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	15922000	USD
CY2011Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	3000000	USD
CY2011Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	12922000	USD
CY2011Q3	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	1657000	USD
CY2011Q3	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	2157000	USD
CY2011Q3	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	269000	USD
CY2011Q3	us-gaap	Servicing Fees Net ServicingFeesNet	-328000	USD
CY2011Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1137000	USD
CY2011Q3	us-gaap	Noninterest Income NoninterestIncome	8508000	USD
CY2011Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	7985000	USD
CY2011Q3	us-gaap	Occupancy Net OccupancyNet	1273000	USD
CY2011Q3	us-gaap	Equipment Expense EquipmentExpense	1405000	USD
CY2011Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1032000	USD
CY2011Q3	us-gaap	General Insurance Expense GeneralInsuranceExpense	845000	USD
CY2011Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	276000	USD
CY2011Q3	us-gaap	Advertising Expense AdvertisingExpense	311000	USD
CY2011Q3	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	394000	USD
CY2011Q3	us-gaap	Legal Fees LegalFees	924000	USD
CY2011Q3	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	5353000	USD
CY2011Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3022000	USD
CY2011Q3	us-gaap	Noninterest Expense NoninterestExpense	22820000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1390000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	-1390000	USD
CY2011Q3	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1190000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-2580000	USD
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.18
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.18
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	57519000	USD
	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	2000	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	4000	USD
	us-gaap	Interest Expense InterestExpense	12090000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	45429000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	39145000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	26835000	USD
	us-gaap	Noninterest Expense NoninterestExpense	71949000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1596000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
	us-gaap	Net Income Loss NetIncomeLoss	-1596000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-5312000	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.37
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.37
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.00
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	61765000	USD
	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	198000	USD
	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	2691000	USD
	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	383000	USD
	us-gaap	Dividend Income Operating DividendIncomeOperating	216000	USD
	us-gaap	Interest Income Federal Funds Sold InterestIncomeFederalFundsSold	1000	USD
	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	197000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	65451000	USD
	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	1275000	USD
	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	11220000	USD
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	3401000	USD
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	610000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	12000	USD
	us-gaap	Interest Expense InterestExpense	16518000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	48933000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	7500000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	41433000	USD
	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	5156000	USD
	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	6021000	USD
	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	732000	USD
	us-gaap	Servicing Fees Net ServicingFeesNet	-221000	USD
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	9153000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	20690000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	38384000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	15277000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	92818000	USD
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	359000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-181861000	USD
	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	2561000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	29687000	USD
	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	3667000	USD
	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	588000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1130000	USD
	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	2259000	USD
	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	2537000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	933000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4044000	USD
	us-gaap	Noninterest Income NoninterestIncome	26846000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	25494000	USD
	us-gaap	Occupancy Net OccupancyNet	3928000	USD
	us-gaap	Equipment Expense EquipmentExpense	4340000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3884000	USD
	us-gaap	General Insurance Expense GeneralInsuranceExpense	2496000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	711000	USD
	us-gaap	Advertising Expense AdvertisingExpense	731000	USD
	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1091000	USD
	us-gaap	Legal Fees LegalFees	2907000	USD
	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	16618000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	9576000	USD
	us-gaap	Noninterest Expense NoninterestExpense	71776000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-3497000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-3497000	USD
	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	3524000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-7021000	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.49
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.49
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	2908000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-962000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3255000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	500000	USD
CY2011Q3	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	-396000	USD
	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	130000	USD
CY2012Q3	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Unrealized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent	1714000	USD
CY2011Q3	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Unrealized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent	-566000	USD
	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Unrealized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent	1920000	USD
	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Unrealized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent	370000	USD
CY2011Q3	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	63000	USD
	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-588000	USD
CY2011Q3	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	25000	USD
	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-241000	USD
CY2011Q3	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	38000	USD
	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-347000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1409000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-528000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1146000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	23000	USD
CY2011Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1918000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-3474000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3160000	USD
	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	1144000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	152925000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	157276000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	5749000	USD
	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	1681000	USD
	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	-365000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-117000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	666000	USD
	osbc	Non Cash Transfer Of Premises To Other Real Estate Owned NonCashTransferOfPremisesToOtherRealEstateOwned	60355000	USD
	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	701000	USD
CY2012Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	2968000	USD
CY2011Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	2823000	USD
CY2011Q3	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	108671000	USD
CY2010Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	98758000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	83958000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	23000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	666000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	49000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2823000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	492000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	35685000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	168979000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-180494000	USD
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	613000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	174000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	49000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-43073000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-179756000	USD
	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	21292000	USD
	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	9913000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-5746000	USD
	osbc	Interest Paid For Deposits InterestPaidForDeposits	13268000	USD
	us-gaap	Interest Paid InterestPaid	623000	USD
CY2011Q3	us-gaap	Stockholders Equity StockholdersEquity	78278000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1146000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	220000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	63000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2968000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	111000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	803000	USD
	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
CY2011Q3	us-gaap	Real Estate Improvements RealEstateImprovements	394000	USD
	us-gaap	Real Estate Improvements RealEstateImprovements	646000	USD
	us-gaap	Real Estate Improvements RealEstateImprovements	2561000	USD
CY2012Q3	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	4829000	USD
CY2011Q3	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	100554000	USD
CY2010Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	75613000	USD
CY2012Q2	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	89671000	USD
CY2011Q2	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	82611000	USD
CY2012Q3	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	7594000	USD
CY2011Q3	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	29842000	USD
	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	26944000	USD
	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	60355000	USD
CY2012Q3	us-gaap	Real Estate Improvements RealEstateImprovements	131000	USD
CY2011Q3	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	9574000	USD
	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	20517000	USD
	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	28754000	USD
CY2012Q3	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	4474000	USD
CY2011Q3	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	2719000	USD
	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	12270000	USD
	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	9221000	USD
CY2012Q2	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	27469000	USD
CY2011Q2	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	21504000	USD
CY2012Q3	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	29286000	USD
CY2011Q3	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	21809000	USD
CY2011Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	23462000	USD
CY2010Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	22220000	USD
	osbc	Real Estate Owned Valuation Allowance Other Adjustments RealEstateOwnedValuationAllowanceOtherAdjustments	169000	USD
	osbc	Real Estate Owned Valuation Allowance Other Adjustments RealEstateOwnedValuationAllowanceOtherAdjustments	68000	USD
CY2012Q3	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	-4474000	USD
CY2011Q3	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	-2719000	USD
	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	-12101000	USD
	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	-9153000	USD
CY2012Q3	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	2071000	USD
CY2011Q3	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	2634000	USD
	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	5886000	USD
	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	7465000	USD
CY2012Q3	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	5685000	USD
CY2011Q3	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	3996000	USD
	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	14659000	USD
	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	13148000	USD
CY2012Q3	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	2657000	USD
CY2011Q3	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	2414000	USD
	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	6446000	USD
	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	9632000	USD
CY2011Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	104779000	USD
CY2012Q3	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	105616000	USD
CY2012Q3	osbc	Federal Home Loan Bank Advances As Percentage Of Total Assets FederalHomeLoanBankAdvancesAsPercentageOfTotalAssets	0.35	pure
CY2012Q3	osbc	Federal Home Loan Bank Advances As Percentage Of Book Value Of Certain Mortgage Loans FederalHomeLoanBankAdvancesAsPercentageOfBookValueOfCertainMortgageLoans	0.60	pure
CY2011Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	9300000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	48400000	USD
CY2012Q3	us-gaap	Secured Debt SecuredDebt	65500000	USD
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1908332	shares
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	10925	shares
CY2012Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	67000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	220000	USD
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14084328	shares
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14034991	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14070783	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14014841	shares
CY2012Q3	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13883008	shares
CY2011Q3	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13789971	shares
	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13873819	shares
	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13783340	shares
CY2012Q3	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	327920	shares
CY2011Q3	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	427245	shares
	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	332198	shares
	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	439052	shares
CY2012Q3	us-gaap	Undistributed Earnings UndistributedEarnings	-1135000	USD
CY2011Q3	us-gaap	Undistributed Earnings UndistributedEarnings	-2580000	USD
	us-gaap	Undistributed Earnings UndistributedEarnings	-5312000	USD
	us-gaap	Undistributed Earnings UndistributedEarnings	-7021000	USD
CY2012Q3	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.08
CY2011Q3	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.18
	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.37
	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.49
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14210928	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14217216	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14206017	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14222392	shares
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-1135000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-2580000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-5312000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-7021000	USD
	osbc	Dividend Restrictions Number Of Previous Years Retained Profit DividendRestrictionsNumberOfPreviousYearsRetainedProfit	P2Y
	us-gaap	Preferred Stock Amount Of Preferred Dividends In Arrears PreferredStockAmountOfPreferredDividendsInArrears	8100000	USD
CY2011Q4	us-gaap	Capital Capital	191439000	USD
CY2011Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	123709000	USD
CY2012Q3	us-gaap	Capital Capital	187106000	USD
CY2012Q3	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	116035000	USD
CY2011Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1238	pure
CY2011Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2012Q3	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1290	pure
CY2012Q3	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2011Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	95986000	USD
CY2011Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	61827000	USD
CY2012Q3	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	93556000	USD
CY2012Q3	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	58019000	USD
CY2011Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0621	pure
CY2011Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0400	pure
CY2012Q3	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0645	pure
CY2012Q3	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0400	pure
CY2011Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	95986000	USD
CY2011Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	77097000	USD
CY2012Q3	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	93556000	USD
CY2012Q3	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	76685000	USD
CY2011Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0498	pure
CY2011Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2012Q3	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2012Q3	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0488	pure
CY2012Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	38185000	USD
CY2012Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	34056000	USD
CY2012Q3	us-gaap	Contractual Obligation ContractualObligation	11752000	USD
CY2011Q4	us-gaap	Contractual Obligation ContractualObligation	14640000	USD
CY2009Q1	us-gaap	Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants	73000000	USD
CY2012Q3	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-305000	USD
	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-774000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-815000	USD
	osbc	Interest Paid For Deposits InterestPaidForDeposits	8444000	USD
	us-gaap	Interest Paid InterestPaid	702000	USD
	osbc	Non Cash Transfer Of Premises To Other Real Estate Owned NonCashTransferOfPremisesToOtherRealEstateOwned	26944000	USD
	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	748000	USD
CY2012Q3	us-gaap	Stockholders Equity StockholdersEquity	70741000	USD
CY2012Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	40257000	USD
CY2012Q3	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	88093000	USD
CY2012Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	20000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	398000	USD
CY2012Q3	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	840000	USD
	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	2930000	USD
CY2012Q3	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	381111000	USD
CY2012Q3	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1255000	USD
	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	3716000	USD
CY2012Q3	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	11800000	USD
	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	93155000	USD
	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	88630000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	181785000	USD
	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	502000	USD
	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	118000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	620000	USD
CY2012Q3	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	1572000	USD
CY2012Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1572000	USD
CY2012Q3	osbc	Financing Receivable Modifications Subsequent Payment Default Number Of Contracts FinancingReceivableModificationsSubsequentPaymentDefaultNumberOfContracts	1	contract
	osbc	Financing Receivable Modifications Subsequent Payment Default Number Of Contracts FinancingReceivableModificationsSubsequentPaymentDefaultNumberOfContracts	1	contract
CY2012Q3	osbc	Financing Receivable Modifications Subsequent Payment Default Recorded Investment FinancingReceivableModificationsSubsequentPaymentDefaultRecordedInvestment	460000	USD
	osbc	Financing Receivable Modifications Subsequent Payment Default Recorded Investment FinancingReceivableModificationsSubsequentPaymentDefaultRecordedInvestment	460000	USD
CY2012Q3	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	5032000	USD
CY2012Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1168032000	USD
CY2012Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	48509000	USD
CY2012Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3603000	USD
CY2012Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3813000	USD
CY2012Q3	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	53841000	USD
CY2012Q3	us-gaap	Other Assets OtherAssets	36090000	USD
CY2012Q3	us-gaap	Assets Assets	1903400000	USD
CY2012Q3	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	798281000	USD
CY2012Q3	us-gaap	Time Deposits TimeDeposits	517542000	USD
CY2012Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	1738000	USD
CY2012Q3	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	58378000	USD
CY2012Q3	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2012Q3	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2012Q3	us-gaap	Other Liabilities OtherLiabilities	30109000	USD
CY2012Q3	us-gaap	Liabilities Liabilities	1832659000	USD
CY2012Q3	us-gaap	Common Stock Value CommonStockValue	18729000	USD
CY2012Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	66118000	USD
CY2012Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	11795000	USD
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2556000	USD
CY2012Q3	us-gaap	Treasury Stock Value TreasuryStockValue	94956000	USD
CY2012Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	16193000	USD
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	51476000	USD
CY2012Q3	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	68000	USD
	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	201000	USD
CY2012Q3	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	1868000	USD
CY2012Q3	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	98000	USD
CY2012Q3	us-gaap	Dividend Income Operating DividendIncomeOperating	77000	USD
	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	89000	USD
CY2012Q3	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	253000	USD
	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	807000	USD
CY2012Q3	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	1973000	USD
	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	6920000	USD
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	3660000	USD
CY2012Q3	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	223000	USD
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	684000	USD
CY2012Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	5000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	13000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6284000	USD
CY2012Q3	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	1489000	USD
	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	4603000	USD
CY2012Q3	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	1982000	USD
	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	5706000	USD
CY2012Q3	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	350000	USD
	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	957000	USD
CY2012Q3	us-gaap	Servicing Fees Net ServicingFeesNet	-155000	USD
	us-gaap	Servicing Fees Net ServicingFeesNet	-365000	USD
CY2012Q3	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	2504000	USD
	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	7509000	USD
CY2012Q3	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	513000	USD
	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	1306000	USD
CY2012Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	425000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1246000	USD
CY2012Q3	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	788000	USD
	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	2661000	USD
CY2012Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1592000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4257000	USD
CY2012Q3	us-gaap	Noninterest Income NoninterestIncome	10348000	USD
	us-gaap	Noninterest Income NoninterestIncome	31208000	USD
CY2012Q3	us-gaap	Occupancy Net OccupancyNet	1242000	USD
	us-gaap	Occupancy Net OccupancyNet	3684000	USD
CY2012Q3	us-gaap	Equipment Expense EquipmentExpense	1078000	USD
	us-gaap	Equipment Expense EquipmentExpense	3416000	USD
CY2012Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1029000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3058000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	222590000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	815000	USD
	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	2437000	USD
	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	4689000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-664000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	220000	USD
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	12101000	USD
CY2012Q3	us-gaap	General Insurance Expense GeneralInsuranceExpense	851000	USD
	us-gaap	General Insurance Expense GeneralInsuranceExpense	2538000	USD
CY2012Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	420000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	865000	USD
CY2012Q3	us-gaap	Advertising Expense AdvertisingExpense	400000	USD
	us-gaap	Advertising Expense AdvertisingExpense	982000	USD
CY2012Q3	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	388000	USD
	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1183000	USD
CY2012Q3	us-gaap	Legal Fees LegalFees	760000	USD
	us-gaap	Legal Fees LegalFees	2215000	USD
CY2012Q3	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	6545000	USD
	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	17987000	USD
CY2012Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3187000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	9186000	USD
CY2012Q3	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	1194000	USD
	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	1335000	USD
CY2012Q3	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-513000	USD
	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1306000	USD
CY2012Q3	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-208000	USD
	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-532000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2339000	USD
	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	1315000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	208710000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	28680000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	65940000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	185861000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	353992000	USD
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-2250000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-115728000	USD
	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	646000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	20915000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	371000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-43847000	USD
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	837000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	63000	USD

Files In Submission

Name	View Source	Status
0001104659-12-077704-index-headers.html	Edgar Link	pending
0001104659-12-077704-index.html	Edgar Link	pending
0001104659-12-077704.txt	Edgar Link	pending
0001104659-12-077704-xbrl.zip	Edgar Link	pending
a12-19947_110q.htm	Edgar Link	pending
a12-19947_1ex31d1.htm	Edgar Link	pending
a12-19947_1ex31d2.htm	Edgar Link	pending
a12-19947_1ex32d1.htm	Edgar Link	pending
a12-19947_1ex32d2.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
osbc-20120930.xml	Edgar Link	completed
osbc-20120930.xsd	Edgar Link	pending
osbc-20120930_cal.xml	Edgar Link	unprocessable
osbc-20120930_def.xml	Edgar Link	unprocessable
osbc-20120930_lab.xml	Edgar Link	unprocessable
osbc-20120930_pre.xml	Edgar Link	unprocessable
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$OSBC
Old Second Bancorp Inc Stock $osbc

2012 Q4 Form 10-Q Financial Statement

#000110465912077704 Filed on November 14, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC Old Second Bancorp Inc Stock $osbc

2012 Q4 Form 10-Q Financial Statement

#000110465912077704 Filed on November 14, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC
Old Second Bancorp Inc Stock $osbc