$OSBC
OLD SECOND BANCORP INC Stock $osbc

$osbc Overview Financials Valuation SEC Filings Company Website

2012 Form 10-K Financial Statement

#000110465913022536 Filed on March 20, 2013

Income Statement

Concept	2012	2011 Q4	2011
Revenue	$75.08M		$85.42M
YoY Change	-12.11%		-19.93%
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	$3.074M	$1.050M	$4.076M
YoY Change	-24.58%	-24.46%	-10.69%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$15.74M		$21.47M
YoY Change	-26.72%		-23.5%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	-$72.00K	-$3.000M	-$6.498M
YoY Change	-98.89%	-74.14%	-90.27%
Income Tax	$0.00	$0.00	$0.00
% Of Pretax Income
Net Earnings	-$72.00K	-$3.000M	-$6.498M
YoY Change	-98.89%	-96.08%	-94.02%
Net Earnings / Revenue	-0.1%		-7.61%
Basic Earnings Per Share	-$0.36		-$0.79
Diluted Earnings Per Share	-$0.36	-$213.8K	-$0.79
COMMON SHARES
Basic Shares Outstanding	14.07M shares	14.03M shares	14.02M shares
Diluted Shares Outstanding	14.21M shares		14.22M shares

Balance Sheet

Concept	2012	2011 Q4	2011
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	$50.48M	$50.50M
YoY Change	-6.93%	-7.62%	-7.51%
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	$1.941B	$1.941B
YoY Change	5.38%	-8.59%	-8.59%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$117.9M	$900.0K	$900.0K
YoY Change	13000.0%	-85.48%	-85.48%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$117.9M	$900.0K	$900.0K
YoY Change	13000.0%	-85.48%	-85.48%
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	$21.90M	$21.90M
YoY Change	56.62%	2.34%	2.34%
Total Long-Term Liabilities	$138.2M	$125.8M	$125.8M
YoY Change	9.86%	0.4%	0.4%
TOTAL LIABILITIES
Total Short-Term Liabilities	$117.9M	$900.0K	$900.0K
Total Long-Term Liabilities	$138.2M	$125.8M	$125.8M
Total Liabilities	$1.973B	$1.867B	$1.867B
YoY Change	5.67%	-8.46%	-8.46%
SHAREHOLDERS EQUITY
Retained Earnings		$17.11M
YoY Change		-39.63%
Common Stock		$18.63M
YoY Change		0.87%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$94.89M
YoY Change		0.05%
Treasury Stock Shares		4.593M shares
Shareholders Equity	$72.60M	$74.00M	$74.00M
YoY Change
Total Liabilities & Shareholders Equity	$2.046B	$1.941B	$1.941B
YoY Change	5.38%	-8.59%	-8.59%

Cashflow Statement

Concept	2012	2011 Q4	2011
OPERATING ACTIVITIES
Net Income	-$72.00K	-$3.000M	-$6.498M
YoY Change	-98.89%	-96.08%	-94.02%
Depreciation, Depletion And Amortization	$3.074M	$1.050M	$4.076M
YoY Change	-24.58%	-24.46%	-10.69%
Cash From Operating Activities	$43.30M	$8.610M	$29.30M
YoY Change	47.78%	-46.92%	-57.65%
INVESTING ACTIVITIES
Capital Expenditures	$1.049M	-$310.0K	$800.0K
YoY Change	31.13%	93.75%	-13.7%
Acquisitions
YoY Change
Other Investing Activities	-$58.05M	-$72.73M	$96.74M
YoY Change	-160.01%	-165.25%	-69.66%
Cash From Investing Activities	-$59.09M	-$73.04M	$95.94M
YoY Change	-161.59%	-165.61%	-69.83%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$63.00K		$49.00K
YoY Change	28.57%		22.5%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	93.35M	6.710M	-173.1M
YoY Change	-153.94%	-106.8%	-53.0%
NET CHANGE
Cash From Operating Activities	43.30M	8.610M	29.30M
Cash From Investing Activities	-59.09M	-73.04M	95.94M
Cash From Financing Activities	93.35M	6.710M	-173.1M
Net Change In Cash	77.56M	-57.72M	-47.81M
YoY Change	-262.23%	-299.45%	-352.03%
FREE CASH FLOW
Cash From Operating Activities	$43.30M	$8.610M	$29.30M
Capital Expenditures	$1.049M	-$310.0K	$800.0K
Free Cash Flow	$42.25M	$8.920M	$28.50M
YoY Change	48.25%	-45.54%	-58.24%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	73000	shares
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0400	pure
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2012	osbc	Dividend Restrictions Number Of Previous Years Retained Profit DividendRestrictionsNumberOfPreviousYearsRetainedProfit	P2Y
CY2011Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	95986000	USD
CY2011Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1238	pure
CY2011Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0621	pure
CY2011Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0498	pure
CY2011Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	123709000	USD
CY2011Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2011Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	77097000	USD
CY2011Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	61827000	USD
CY2011Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2011Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0400	pure
CY2012Q4	us-gaap	Capital Capital	189465000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	94816000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	94816000	USD
CY2012Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	111286000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	55692000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	78199000	USD
CY2012Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1362	pure
CY2012Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0681	pure
CY2012Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0485	pure
CY2012Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2012	dei	Entity Registrant Name EntityRegistrantName	OLD SECOND BANCORP INC
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000357173
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Smaller Reporting Company
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	14120918	shares
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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	Available For Sale Securities AvailableForSaleSecurities	307564000	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 Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1368985000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	51997000	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
CY2012Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	128507000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1111453000	USD
CY2012Q4	us-gaap	Assets Assets	2045799000	USD
CY2011Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	361963000	USD
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
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
CY2012Q4	osbc	Time Deposit Less Than100000 Brokered TimeDepositLessThan100000Brokered	100000	USD
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
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	18729134	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	14084328	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	4644806	shares
CY2012	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	75081000	USD
CY2012	us-gaap	Interest Expense InterestExpense	15735000	USD
CY2012	us-gaap	Noninterest Expense NoninterestExpense	96048000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-72000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	-72000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-5059000	USD
CY2011	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	80084000	USD
CY2011	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	342000	USD
CY2011	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	3989000	USD
CY2011	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	487000	USD
CY2011	us-gaap	Dividend Income Operating DividendIncomeOperating	290000	USD
CY2011	us-gaap	Interest Income Federal Funds Sold InterestIncomeFederalFundsSold	1000	USD
CY2011	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	230000	USD
CY2011	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	85423000	USD
CY2011	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	1579000	USD
CY2011	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	14478000	USD
CY2011	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	1000	USD
CY2011	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	4577000	USD
CY2011	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	822000	USD
CY2011	us-gaap	Interest Expense Debt InterestExpenseDebt	16000	USD
CY2011	us-gaap	Interest Expense InterestExpense	21473000	USD
CY2011	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	6817000	USD
CY2011	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	8135000	USD
CY2011	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	1055000	USD
CY2011	us-gaap	Servicing Fees Net ServicingFeesNet	-341000	USD
CY2011	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	5458000	USD
CY2011	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	631000	USD
CY2011	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1629000	USD
CY2011	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	3004000	USD
CY2011	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	3635000	USD
CY2011	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	1311000	USD
CY2011	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4674000	USD
CY2011	us-gaap	Noninterest Income NoninterestIncome	36008000	USD
CY2012	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	17000	USD
CY2011	us-gaap	Labor And Related Expense LaborAndRelatedExpense	34015000	USD
CY2011	us-gaap	Occupancy Net OccupancyNet	5112000	USD
CY2011	us-gaap	Equipment Expense EquipmentExpense	5601000	USD
CY2011	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4854000	USD
CY2011	us-gaap	General Insurance Expense GeneralInsuranceExpense	3320000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	847000	USD
CY2011	us-gaap	Advertising Expense AdvertisingExpense	1106000	USD
CY2011	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1424000	USD
CY2011	us-gaap	Legal Fees LegalFees	4118000	USD
CY2011	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	24356000	USD
CY2011	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12816000	USD
CY2011	us-gaap	Noninterest Expense NoninterestExpense	97569000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-6498000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	-6498000	USD
CY2011	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	4730000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-11228000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.79
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.79
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.00
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-469000	USD
CY2011	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	-270000	USD
CY2011	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Unrealized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent	-199000	USD
CY2011	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-631000	USD
CY2011	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-258000	USD
CY2011	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-373000	USD
CY2011	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-572000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-7070000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	5614000	USD
CY2012	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Unrealized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent	3309000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	2375000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2303000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	43303000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-59094000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	93349000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	77558000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4076000	USD
CY2011	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	1571000	USD
CY2011	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	228960000	USD
CY2011	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	231420000	USD
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	5750000	USD
CY2011	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	-7400000	USD
CY2011	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	-2797000	USD
CY2011	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-156000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	951000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	29303000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	56044000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	26281000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	241867000	USD
CY2011	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-216503000	USD
CY2011	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	2984000	USD
CY2011	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	43124000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	800000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	95942000	USD
CY2011	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-167747000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-572000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2375000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	951000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	291000	USD
CY2011	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	49000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	63000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	528000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	1664000	USD
CY2012Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	88985000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	41169000	USD
CY2011	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-1117000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-4141000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	49000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-173054000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-47809000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-815000	USD
CY2012	osbc	Interest Paid For Deposits InterestPaidForDeposits	10592000	USD
CY2012	us-gaap	Interest Paid InterestPaid	930000	USD
CY2012	osbc	Non Cash Transfer Of Premises To Other Real Estate Owned NonCashTransferOfPremisesToOtherRealEstateOwned	360000	USD
CY2012	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	1006000	USD
CY2011	osbc	Interest Paid For Deposits InterestPaidForDeposits	16751000	USD
CY2011	us-gaap	Interest Paid InterestPaid	838000	USD
CY2011	osbc	Non Cash Transfer Of Premises To Other Real Estate Owned NonCashTransferOfPremisesToOtherRealEstateOwned	472000	USD
CY2011	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	942000	USD
CY2010Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	98758000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	3981000	USD
CY2011Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	3788000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	83958000	USD
CY2011	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
CY2012	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
CY2012Q2	dei	Entity Public Float EntityPublicFloat	17300000	USD
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	6400000	USD
CY2012	osbc	Increase Decrease In Federal Home Loan Bank Stock IncreaseDecreaseInFederalHomeLoanBankStock	-2800000	USD
CY2012Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	4800000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	9300000	USD
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14074188	shares
CY2012	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13876129	shares
CY2012	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	331123	shares
CY2012	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	4987000	USD
CY2012	us-gaap	Undistributed Earnings UndistributedEarnings	-5059000	USD
CY2012	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.36
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.36
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14019920	shares
CY2011	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13785011	shares
CY2011	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	435811	shares
CY2011	us-gaap	Undistributed Earnings UndistributedEarnings	-11228000	USD
CY2011	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.79
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.36
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14207252	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14220822	shares
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-5059000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-11228000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	313858000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	582141000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	2140000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	7899000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	10154000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	579886000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	3775000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	10069000	USD
CY2012	osbc	Available For Sale Securities Additions AvailableForSaleSecuritiesAdditions	272300000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	4967000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	29100000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	34110000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	34165000	USD
CY2012Q4	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Amortized Cost Basis AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis	102342000	USD
CY2012	osbc	Available For Sale Securities Debt Maturities Within One Year Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCostWeightedAverageYield	0.0177	pure
CY2012	osbc	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostWeightedAverageYield	0.0193	pure
CY2012	osbc	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostWeightedAverageYield	0.0292	pure
CY2012	osbc	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostWeightedAverageYield	0.0361	pure
CY2012	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Weighted Average Yield AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateWeightedAverageYield	0.0281	pure
CY2012	osbc	Available For Sale Securities Weighted Average Yield AvailableForSaleSecuritiesWeightedAverageYield	0.0182	pure
CY2012Q4	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Fair Value AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue	104098000	USD
CY2012Q4	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	32	security
CY2011Q4	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	22	security
CY2012Q4	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	3	security
CY2011Q4	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	2	security
CY2012Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	35	security
CY2011Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	24	security
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	2151000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	223860000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	738000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1937000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	107000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	362000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	631000	USD
CY2010Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	75613000	USD
CY2011	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	71915000	USD
CY2011	us-gaap	Real Estate Improvements RealEstateImprovements	2984000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	8014000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	7918000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	10154000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	10069000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	155213000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	93913000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	12300000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	9974000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	167513000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	103887000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	1575000	USD
CY2011	osbc	Available For Sale Securities Gross Realized Gain Loss Net Tax AvailableForSaleSecuritiesGrossRealizedGainLossNetTax	258000	USD
CY2012	osbc	Available For Sale Securities Gross Realized Gain Loss Net Tax AvailableForSaleSecuritiesGrossRealizedGainLossNetTax	641000	USD
CY2011	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	41813000	USD
CY2011	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	15409000	USD
CY2012Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	72423000	USD
CY2012	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	32121000	USD
CY2012	us-gaap	Real Estate Improvements RealEstateImprovements	701000	USD
CY2012	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	36854000	USD
CY2012	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	16835000	USD
CY2010Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	22220000	USD
CY2011Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	23462000	USD
CY2012Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	31454000	USD
CY2011	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	-15114000	USD
CY2012	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	-16385000	USD
CY2011	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	14167000	USD
CY2012	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	8843000	USD
CY2011	osbc	Real Estate Owned Valuation Allowance Other Adjustments RealEstateOwnedValuationAllowanceOtherAdjustments	295000	USD
CY2012	osbc	Real Estate Owned Valuation Allowance Other Adjustments RealEstateOwnedValuationAllowanceOtherAdjustments	450000	USD
CY2012	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2198000	USD
CY2011	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	9242000	USD
CY2012	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	7973000	USD
CY2012	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	3497000	USD
CY2011	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	19410000	USD
CY2012	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	18663000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1149944000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1369058000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1150050000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	6529000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	6357000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	89000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	12975000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1059556000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	77519000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	89000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	7026000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	5103000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	318000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	12447000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1229752000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	126786000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	318000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	60679000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	77940000	USD
CY2012	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	68403000	USD
CY2012	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	642000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	28306000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	36433000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	6259000	USD
CY2012	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	45402000	USD
CY2012	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	40000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	88985000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	114373000	USD
CY2012	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	113805000	USD
CY2012	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	682000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	76127000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	62498000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	138625000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	128039000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	70614000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	198653000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	13054000	USD
CY2011	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	96438000	USD
CY2011	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	86806000	USD
CY2011	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	451000	USD
CY2011	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	177000	USD
CY2011	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	183244000	USD
CY2011	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	628000	USD
CY2012Q4	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts FinancingReceivableModificationsSubsequentDefaultNumberOfContracts	1	contract
CY2012Q4	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment FinancingReceivableModificationsSubsequentDefaultRecordedInvestment	460000	USD
CY2011Q4	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts FinancingReceivableModificationsSubsequentDefaultNumberOfContracts	17	contract
CY2011Q4	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment FinancingReceivableModificationsSubsequentDefaultRecordedInvestment	5152000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	4318000	USD
CY2012	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	13486000	USD
CY2012	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	14118000	USD
CY2012	osbc	Loans And Leases Receivable Related Parties Increase Decrease Due To Change In Related Party Status LoansAndLeasesReceivableRelatedPartiesIncreaseDecreaseDueToChangeInRelatedPartyStatus	100000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	3586000	USD
CY2010Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	6171000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	27865000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	-8181000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	38597000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	6259000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	32338000	USD
CY2012Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1061065000	USD
CY2010Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	76308000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	-7971000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	13054000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	38943000	USD
CY2011Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	138625000	USD
CY2011Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1230360000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	101988000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	54986000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	47002000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	109000000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	58523000	USD
CY2011Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	95986000	USD
CY2011Q4	us-gaap	Capital Capital	191439000	USD
CY2009Q1	us-gaap	Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants	73000000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	4991000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	29848000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	35018000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	34241000	USD
CY2011	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	9306000	USD
CY2011	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	9461000	USD
CY2011	osbc	Loans And Leases Receivable Related Parties Increase Decrease Due To Change In Related Party Status LoansAndLeasesReceivableRelatedPartiesIncreaseDecreaseDueToChangeInRelatedPartyStatus	1698000	USD
CY2012Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	4116000	USD
CY2012Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	84286000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	11202000	USD
CY2012Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	54203000	USD
CY2012Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	379451000	USD
CY2012Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	210100000	USD
CY2011Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	40900000	USD
CY2012	osbc	Loans And Leases Receivable Related Parties Number Of Directors Retired LoansAndLeasesReceivableRelatedPartiesNumberOfDirectorsRetired	1	item
CY2012	us-gaap	Preferred Stock Amount Of Preferred Dividends In Arrears PreferredStockAmountOfPreferredDividendsInArrears	9100000	USD
CY2012Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Goodwill DeferredTaxAssetsGoodwillAndIntangibleAssetsGoodwill	16796000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	785000	USD
CY2012Q4	osbc	Deferred Tax Assets Other Real Estate Owned Write Downs DeferredTaxAssetsOtherRealEstateOwnedWriteDowns	16632000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	20736000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	10186000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1444000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	585000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-302000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-719000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-436000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-5214000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	738000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	18236000	USD
CY2012Q4	osbc	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation	679000	USD
CY2012Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets	965000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	87044000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1063000	USD
CY2012Q4	osbc	Deferred Tax Liabilities Accretion On Securities DeferredTaxLiabilitiesAccretionOnSecurities	122000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	1819000	USD
CY2012Q4	osbc	Deferred Tax Liabilities State Tax Benefits DeferredTaxLiabilitiesStateTaxBenefits	7315000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	217000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10536000	USD
CY2012Q4	osbc	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	76508000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	76508000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	928000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1265000	USD
CY2011Q4	osbc	Deferred Tax Liabilities Accretion On Securities DeferredTaxLiabilitiesAccretionOnSecurities	37000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	1538000	USD
CY2011Q4	osbc	Deferred Tax Liabilities State Tax Benefits DeferredTaxLiabilitiesStateTaxBenefits	7201000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	690000	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10731000	USD
CY2011Q4	osbc	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	75770000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	75770000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	2592000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	24361000	USD
CY2011Q4	osbc	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation	628000	USD
CY2011Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets	583000	USD
CY2011Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Goodwill DeferredTaxAssetsGoodwillAndIntangibleAssetsGoodwill	18322000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1111000	USD
CY2011Q4	osbc	Deferred Tax Assets Other Real Estate Owned Write Downs DeferredTaxAssetsOtherRealEstateOwnedWriteDowns	10094000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	19810000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	9740000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1444000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	408000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	86501000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Provision For Loan Losses DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses	6125000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Provision For Loan Losses DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses	9474000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Deferred Compensation DeferredIncomeTaxExpenseBenefitDeferredCompensation	-51000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Deferred Compensation DeferredIncomeTaxExpenseBenefitDeferredCompensation	113000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Intangible Assets DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets	-382000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Intangible Assets DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets	-48000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost	326000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost	17000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Other Real Estate Owned Write Downs DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns	-6538000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Other Real Estate Owned Write Downs DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns	-900000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Domestic DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic	-926000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Domestic DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic	-11921000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards State And Local DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal	-446000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards State And Local DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal	-4651000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-25000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Depreciation DeferredIncomeTaxExpenseBenefitDepreciation	-202000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Depreciation DeferredIncomeTaxExpenseBenefitDepreciation	-200000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Premiums And Discounts On Securities Net DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet	85000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Premiums And Discounts On Securities Net DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet	35000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Mortgage Servicing Rights DeferredIncomeTaxExpenseBenefitMortgageServicingRights	281000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Mortgage Servicing Rights DeferredIncomeTaxExpenseBenefitMortgageServicingRights	-99000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Goodwill DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill	1526000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Goodwill DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill	628000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	-650000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	-217000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-2274000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	192000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	216000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-563000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-570000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	299000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	346000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-204000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	206000	USD
CY2011Q4	osbc	Mortgage Loans Servicing Asset At Fair Value Amount MortgageLoansServicingAssetAtFairValueAmount	458700000	USD
CY2012	us-gaap	Servicing Fees Net ServicingFeesNet	-289000	USD
CY2012	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	item
CY2012Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	216305000	USD
CY2012Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	286860000	USD
CY2012Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	323811000	USD
CY2012Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	318844000	USD
CY2012Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	191948000	USD
CY2011Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	196870000	USD
CY2011Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	275957000	USD
CY2011Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	288508000	USD
CY2011Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	390530000	USD
CY2011Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	226953000	USD
CY2012Q4	osbc	Time Deposit100000 Or More Brokered TimeDeposit100000OrMoreBrokered	100000	USD
CY2011Q4	osbc	Time Deposit100000 Or More Brokered TimeDeposit100000OrMoreBrokered	795000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	244695000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	183189000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	51245000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	18579000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	13084000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess	20701000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths	15594000	USD
CY2011Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths	27378000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More After12 Months ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months	103044000	USD
CY2011Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess	65073000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months	52609000	USD
CY2011Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months	44394000	USD
CY2011Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More After12 Months ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months	90108000	USD
CY2012Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	221753000	USD
CY2011Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	104779000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	117875000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	103878000	USD
CY2012Q4	osbc	Number Of Customers With Secured Balances Exceeding Ten Percent Of Stockholders Equity NumberOfCustomersWithSecuredBalancesExceedingTenPercentOfStockholdersEquity	1	item
CY2012	osbc	Long Term Debt Maturities Repayments Of Principal Weighted Average Interest Rate After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateAfterYearFive	0.0495	pure
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	901000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	103878000	USD
CY2011	osbc	Long Term Debt Maturities Repayments Of Principal Weighted Average Interest Rate After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateAfterYearFive	0.0495	pure
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1908332	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	10925	shares
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	291000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	951000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	125000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	113000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	95000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	58000	USD
CY2012Q4	osbc	Mortgage Loans Servicing Asset At Fair Value Amount MortgageLoansServicingAssetAtFairValueAmount	552000000	USD
CY2011Q4	osbc	Time Deposit Less Than100000 Brokered TimeDepositLessThan100000Brokered	135000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	5933000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-53000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-434000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-2991000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	941000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	903000	USD
CY2012	osbc	Rolling Period Quarterly Adjustment For Actual Loss History RollingPeriodQuarterlyAdjustmentForActualLossHistory	P5Y
CY2012Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	44221000	USD
CY2012Q4	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	9571000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3276000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	24160000	USD
CY2012Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	826976000	USD
CY2011Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	761335000	USD
CY2012Q4	us-gaap	Time Deposits TimeDeposits	510792000	USD
CY2011Q4	us-gaap	Time Deposits TimeDeposits	617483000	USD
CY2012Q4	us-gaap	Deposits Deposits	1717219000	USD
CY2011Q4	us-gaap	Deposits Deposits	1740781000	USD
CY2012Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	17875000	USD
CY2011Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	901000	USD
CY2012Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	100000000	USD
CY2012Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	58378000	USD
CY2011Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	58378000	USD
CY2012Q4	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2011Q4	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2012Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2011Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	34275000	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	21856000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	1973247000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	1867416000	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	71869000	USD
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue	70863000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	18729000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	18628000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	66189000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	65999000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	12048000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	17107000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1327000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3702000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	94956000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	94893000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	72552000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	74002000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2045799000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1941418000	USD
CY2012	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	66769000	USD
CY2012	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	260000	USD
CY2012	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	7212000	USD
CY2012	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	416000	USD
CY2012	us-gaap	Dividend Income Operating DividendIncomeOperating	305000	USD
CY2012	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	119000	USD
CY2012	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1548000	USD
CY2012	us-gaap	Legal Fees LegalFees	3176000	USD
CY2012	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	24358000	USD
CY2012	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12396000	USD
CY2012	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	59346000	USD
CY2011	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	63950000	USD
CY2012	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	1062000	USD
CY2012	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	8809000	USD
CY2012	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	2000	USD
CY2012	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	4925000	USD
CY2012	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	903000	USD
CY2012	us-gaap	Interest Expense Debt InterestExpenseDebt	17000	USD
CY2012	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	6041000	USD
CY2012	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	7682000	USD
CY2012	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	1307000	USD
CY2012	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	10688000	USD
CY2012	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	1575000	USD
CY2012	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1608000	USD
CY2012	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	3547000	USD
CY2012	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5060000	USD
CY2012	us-gaap	Noninterest Income NoninterestIncome	42914000	USD
CY2012	us-gaap	Labor And Related Expense LaborAndRelatedExpense	34989000	USD
CY2012	us-gaap	Occupancy Net OccupancyNet	4841000	USD
CY2012	us-gaap	Equipment Expense EquipmentExpense	4614000	USD
CY2012	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4031000	USD
CY2012	us-gaap	General Insurance Expense GeneralInsuranceExpense	3384000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1402000	USD
CY2012	us-gaap	Advertising Expense AdvertisingExpense	1309000	USD
CY2012	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6284000	USD
CY2011	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	8887000	USD
CY2012	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	53062000	USD
CY2011	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	55063000	USD
CY2012	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	2305000	USD
CY2012	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1575000	USD
CY2012	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-641000	USD
CY2012	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-934000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3074000	USD
CY2012	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	1575000	USD
CY2012	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	291559000	USD
CY2012	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	303561000	USD
CY2012	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	815000	USD
CY2012	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	-8381000	USD
CY2012	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	8119000	USD
CY2012	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-943000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	291000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	79642000	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	571153000	USD
CY2012	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-167490000	USD
CY2012	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	701000	USD
CY2012	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	39052000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1049000	USD
CY2012	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-23562000	USD
CY2012	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	16974000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	100000000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	63000	USD
CY2012	osbc	Number Of Days Past Due Maximum NumberOfDaysPastDueMaximum	P90D
CY2012Q4	us-gaap	Deposit Liabilities With Abnormal Terms DepositLiabilitiesWithAbnormalTerms	2100000	USD
CY2011Q4	us-gaap	Deposit Liabilities With Abnormal Terms DepositLiabilitiesWithAbnormalTerms	1800000	USD
CY2012	osbc	Debt Maturities Repayments Of Principal Weighted Average Interest Rate In Next Twelve Months DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInNextTwelveMonths	0.0012	pure
CY2011	osbc	Debt Maturities Repayments Of Principal Weighted Average Interest Rate In Next Twelve Months DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInNextTwelveMonths	0.0003	pure
CY2012	osbc	Debt Maturities Repayments Of Principal Weighted Average Interest Rate DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRate	0.0238	pure
CY2011	osbc	Debt Maturities Repayments Of Principal Weighted Average Interest Rate DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRate	0.0491	pure
CY2012	osbc	Proceeds From Sale Of Loans Held For Sale Net ProceedsFromSaleOfLoansHeldForSaleNet	303600000	USD
CY2012	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	567000	USD
CY2011	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	107000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	393000	USD
CY2011	osbc	Operating Leases Lease Revenue Expense Net OperatingLeasesLeaseRevenueExpenseNet	69000	USD
CY2012	osbc	Operating Leases Lease Revenue Expense Net OperatingLeasesLeaseRevenueExpenseNet	50000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit State Tax Benefits DeferredIncomeTaxExpenseBenefitStateTaxBenefits	114000	USD
CY2011	osbc	Deferred Income Tax Expense Benefit State Tax Benefits DeferredIncomeTaxExpenseBenefitStateTaxBenefits	1836000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	928000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	2592000	USD
CY2010	osbc	Illinois Corporate Tax Rate IllinoisCorporateTaxRate	0.073	pure
	osbc	State And Local Personal Property Replacement Tax Rate StateAndLocalPersonalPropertyReplacementTaxRate	0.025	pure
	osbc	Illinois Corporate Tax Rate IllinoisCorporateTaxRate	0.095	pure
CY2012	osbc	Period From Due Date After Which Accrual Of Interest Income Is Discontinued PeriodFromDueDateAfterWhichAccrualOfInterestIncomeIsDiscontinued	P90D
CY2012Q4	osbc	Loans And Leases Receivable Deferred Income Expense Net LoansAndLeasesReceivableDeferredIncomeExpenseNet	-106000	USD
CY2011Q4	osbc	Loans And Leases Receivable Deferred Income Expense Net LoansAndLeasesReceivableDeferredIncomeExpenseNet	73000	USD
CY2012	osbc	Preferred Stock Dividends And Other Adjustments Equity Impact PreferredStockDividendsAndOtherAdjustmentsEquityImpact	3981000	USD
CY2011	osbc	Preferred Stock Dividends And Other Adjustments Equity Impact PreferredStockDividendsAndOtherAdjustmentsEquityImpact	3788000	USD
CY2012	osbc	Gain Loss On Transfer Of Property To Other Real Estate GainLossOnTransferOfPropertyToOtherRealEstate	782000	USD
CY2011	osbc	Gain Loss On Transfer Of Property To Other Real Estate GainLossOnTransferOfPropertyToOtherRealEstate	415000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-5746000	USD
CY2012	osbc	Financing Receivable Modification Number Of Contracts FinancingReceivableModificationNumberOfContracts	13	contract
CY2012Q4	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment1 FinancingReceivableModificationsPreModificationRecordedInvestment1	6613000	USD
CY2012Q4	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment1 FinancingReceivableModificationsPostModificationRecordedInvestment1	5182000	USD
CY2011	osbc	Financing Receivable Modification Number Of Contracts FinancingReceivableModificationNumberOfContracts	16	contract
CY2011Q4	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment1 FinancingReceivableModificationsPreModificationRecordedInvestment1	6644000	USD
CY2011Q4	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment1 FinancingReceivableModificationsPostModificationRecordedInvestment1	4667000	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	609000	USD
CY2012	us-gaap	Proceeds From Sale Of Federal Reserve Stock ProceedsFromSaleOfFederalReserveStock	2848000	USD
CY2011	us-gaap	Payments To Acquire Federal Reserve Stock PaymentsToAcquireFederalReserveStock	359000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	917000	USD
CY2012	osbc	Non Cash Transfer Of Loans To Other Real Estate Owned NonCashTransferOfLoansToOtherRealEstateOwned	31761000	USD
CY2011	osbc	Non Cash Transfer Of Loans To Other Real Estate Owned NonCashTransferOfLoansToOtherRealEstateOwned	71443000	USD
CY2011Q1	osbc	Defined Contribution Plan Employer Matching Contribution Percent Upto Maximum Three Precentage Of Employee Compensation DefinedContributionPlanEmployerMatchingContributionPercentUptoMaximumThreePrecentageOfEmployeeCompensation	1.00	pure
CY2011Q1	osbc	Defined Contribution Plan Maximum Annual Contribution Per Employee For Which Employer Contributes Hundred Percent DefinedContributionPlanMaximumAnnualContributionPerEmployeeForWhichEmployerContributesHundredPercent	0.03	pure
CY2011Q1	osbc	Defined Contribution Plan Additional Employer Matching Contribution Percent DefinedContributionPlanAdditionalEmployerMatchingContributionPercent	0.50	pure
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	1.00	pure
	us-gaap	Defined Contribution Plan Maximum Annual Contribution Per Employee Percent DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent	0.02	pure
CY2012	osbc	Defined Contribution Plan Employers Discretionary Contribution Vesting Percentage DefinedContributionPlanEmployersDiscretionaryContributionVestingPercentage	1.00	pure
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	441000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	470000	USD
CY2012Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1500000	USD
CY2011Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1400000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="MARGIN: 0in 0in 0pt"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Use of Estimates</font></b> <font style="FONT-SIZE: 10pt" size="2">— The preparation of consolidated financial statements in conformity with generally accepted accounting principles (“GAAP”) and following general practices within the banking industry requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes.  Although these estimates and assumptions are based on the best available information, actual results could differ from those estimates.</font></p></div>
CY2012	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="MARGIN: 0in 0in 0pt"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Concentration of Credit Risk</font></b> <font style="FONT-SIZE: 10pt" size="2">— Most of the Company’s business activity is with customers located within Cook, Kane, Kendall, DeKalb, DuPage, LaSalle, and Will counties in Illinois.  These banking centers surround the Chicago metropolitan area.  Therefore, the Company’s exposure to credit risk is significantly affected by changes in the economy in that market area since the Bank generally makes loans within its market.  There are no significant concentrations of loans where the customers’ ability to honor loan terms is dependent upon a single economic sector, although the real estate related categories represented 90.1% and 91.5% of the portfolio at December 31, 2012 and 2011, respectively.</font></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p></div>
CY2012	us-gaap	Advertising Cost Policy Expensed Advertising Cost AdvertisingCostPolicyExpensedAdvertisingCost	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="MARGIN: 0in 0in 0pt"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Advertising Costs</font></b><font style="FONT-SIZE: 10pt" size="2"> — All advertising costs incurred by the Company are expensed in the period in which they are incurred.</font></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p></div>

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0001104659-13-022536-index-headers.html	Edgar Link	pending
0001104659-13-022536-index.html	Edgar Link	pending
0001104659-13-022536.txt	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
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g298401bii001.jpg	Edgar Link	pending
osbc-20121231.xml	Edgar Link	completed
osbc-20121231.xsd	Edgar Link	pending
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$OSBC
OLD SECOND BANCORP INC Stock $osbc

2012 Form 10-K Financial Statement

#000110465913022536 Filed on March 20, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC OLD SECOND BANCORP INC Stock $osbc

2012 Form 10-K Financial Statement

#000110465913022536 Filed on March 20, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC
OLD SECOND BANCORP INC Stock $osbc