$OSBC
Old Second Bancorp Inc Stock $osbc

$osbc Overview Financials Valuation SEC Filings Company Website

2013 Q1 Form 10-Q Financial Statement

#000110465913041910 Filed on May 15, 2013

Income Statement

Concept	2013 Q1	2012 Q1
Revenue	$17.49M	$19.45M
YoY Change	-10.08%	-13.27%
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	$746.0K	$801.0K
YoY Change	-6.87%	-26.11%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$3.588M	$4.346M
YoY Change	-17.44%	-26.2%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$5.471M	-$2.968M
YoY Change	-284.33%	-4.87%
Income Tax	$0.00	$0.00
% Of Pretax Income	0.0%
Net Earnings	$5.471M	-$2.968M
YoY Change	-284.33%	-4.87%
Net Earnings / Revenue	31.28%	-15.26%
Basic Earnings Per Share	$0.30	-$0.30
Diluted Earnings Per Share	$0.30	-$0.30
COMMON SHARES
Basic Shares Outstanding	14.08M shares	14.04M shares
Diluted Shares Outstanding	14.16M shares	14.20M shares

Balance Sheet

Concept	2013 Q1	2012 Q1
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	$47.36M	$49.83M
YoY Change	-4.96%	-7.21%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$1.954B	$1.982B
YoY Change	-1.39%	-6.33%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$20.80M	$16.80M
YoY Change	23.81%	158.46%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$20.80M	$16.80M
YoY Change	23.81%	158.46%
LONG-TERM LIABILITIES
Long-Term Debt	$103.9M	$103.9M
YoY Change	0.0%	0.0%
Other Long-Term Liabilities	$35.30M	$26.40M
YoY Change	33.71%	17.33%
Total Long-Term Liabilities	$139.2M	$130.3M
YoY Change	6.83%	3.09%
TOTAL LIABILITIES
Total Short-Term Liabilities	$20.80M	$16.80M
Total Long-Term Liabilities	$139.2M	$130.3M
Total Liabilities	$1.878B	$1.911B
YoY Change	-1.71%	-6.11%
SHAREHOLDERS EQUITY
Retained Earnings	$16.75M	$12.92M
YoY Change	29.66%
Common Stock	$18.78M	$18.73M
YoY Change	0.27%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$95.71M	$94.96M
YoY Change	0.79%
Treasury Stock Shares	4.897M shares	4.645M shares
Shareholders Equity	$75.85M	$70.61M
YoY Change
Total Liabilities & Shareholders Equity	$1.954B	$1.982B
YoY Change	-1.39%	-6.33%

Cashflow Statement

Concept	2013 Q1	2012 Q1
OPERATING ACTIVITIES
Net Income	$5.471M	-$2.968M
YoY Change	-284.33%	-4.87%
Depreciation, Depletion And Amortization	$746.0K	$801.0K
YoY Change	-6.87%	-26.11%
Cash From Operating Activities	$2.170M	$11.33M
YoY Change	-80.85%	74.85%
INVESTING ACTIVITIES
Capital Expenditures	$1.123M	$154.0K
YoY Change	629.22%	63.83%
Acquisitions
YoY Change
Other Investing Activities	$47.79M	-$24.44M
YoY Change	-295.54%	-132.49%
Cash From Investing Activities	$46.67M	-$24.59M
YoY Change	-289.79%	-132.73%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$185.0K	$63.00K
YoY Change	193.65%	28.57%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-96.22M	38.93M
YoY Change	-347.16%	-756.49%
NET CHANGE
Cash From Operating Activities	2.170M	11.33M
Cash From Investing Activities	46.67M	-24.59M
Cash From Financing Activities	-96.22M	38.93M
Net Change In Cash	-47.38M	25.67M
YoY Change	-284.57%	-66.09%
FREE CASH FLOW
Cash From Operating Activities	$2.170M	$11.33M
Capital Expenditures	$1.123M	$154.0K
Free Cash Flow	$1.047M	$11.18M
YoY Change	-90.63%	75.01%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q1	us-gaap	General Insurance Expense GeneralInsuranceExpense	846000	USD
CY2013Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	525000	USD
CY2012Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	195000	USD
CY2013Q1	us-gaap	Advertising Expense AdvertisingExpense	166000	USD
CY2012Q1	us-gaap	Advertising Expense AdvertisingExpense	318000	USD
CY2013Q1	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	344000	USD
CY2012Q1	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	342000	USD
CY2013Q1	us-gaap	Legal Fees LegalFees	323000	USD
CY2012Q1	us-gaap	Legal Fees LegalFees	685000	USD
CY2013Q1	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	3686000.	USD
CY2012Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6084000	USD
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	73000	shares
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2013Q1	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	41000	USD
CY2013Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	42000	USD
CY2012Q1	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	2605000	USD
CY2013Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	4000	USD
CY2013Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	16402000	USD
CY2012Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	9020000	USD
CY2013Q1	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	1491000	USD
CY2012Q1	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	1651000	USD
CY2013Q1	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	1677000	USD
CY2012Q1	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	1831000	USD
CY2013Q1	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	230000	USD
CY2012Q1	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	296000	USD
CY2013Q1	us-gaap	Servicing Fees Net ServicingFeesNet	244000	USD
CY2012Q1	us-gaap	Servicing Fees Net ServicingFeesNet	187000	USD
CY2013Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	1976000	USD
CY2012Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	2647000	USD
CY2013Q1	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	1453000	USD
CY2012Q1	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	101000	USD
CY2013Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	407000	USD
CY2012Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	495000	USD
CY2013Q1	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	792000	USD
CY2012Q1	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	760000	USD
CY2013Q1	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	408000	USD
CY2012Q1	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	1179000	USD
CY2013Q1	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	181000	USD
CY2012Q1	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	23000	USD
CY2013Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1737000	USD
CY2012Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1294000	USD
CY2013Q1	us-gaap	Noninterest Income NoninterestIncome	10596000	USD
CY2012Q1	us-gaap	Noninterest Income NoninterestIncome	10464000	USD
CY2013Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	9032000	USD
CY2012Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	9049000	USD
CY2013Q1	us-gaap	Occupancy Net OccupancyNet	1279000	USD
CY2012Q1	us-gaap	Occupancy Net OccupancyNet	1235000	USD
CY2013Q1	us-gaap	Equipment Expense EquipmentExpense	1144000	USD
CY2012Q1	us-gaap	Equipment Expense EquipmentExpense	1155000	USD
CY2013Q1	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1035000	USD
CY2012Q1	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1000000	USD
CY2013Q1	us-gaap	General Insurance Expense GeneralInsuranceExpense	849000	USD
CY2013Q1	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	73000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2013Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2013Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2013Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	18779734	shares
CY2013Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	13882910	shares
CY2013Q1	us-gaap	Treasury Stock Shares TreasuryStockShares	4896824	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
CY2013Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	14914000	USD
CY2012Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	17666000	USD
CY2012Q1	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	84000	USD
CY2013Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	2298000	USD
CY2012Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	1498000	USD
CY2013Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	119000	USD
CY2012Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	103000	USD
CY2013Q1	us-gaap	Dividend Income Operating DividendIncomeOperating	76000	USD
CY2012Q1	us-gaap	Dividend Income Operating DividendIncomeOperating	74000	USD
CY2012Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	25000	USD
CY2013Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	17490000	USD
CY2012Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	19450000	USD
CY2013Q1	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	228000	USD
CY2012Q1	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	300000	USD
CY2013Q1	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	1853000	USD
CY2013Q1	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	19000	USD
CY2012Q1	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	3000	USD
CY2013Q1	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1287000	USD
CY2012Q1	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1197000	USD
CY2013Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	196000	USD
CY2012Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	237000	USD
CY2012Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	4000	USD
CY2013Q1	us-gaap	Interest Expense InterestExpense	3588000	USD
CY2012Q1	us-gaap	Interest Expense InterestExpense	4346000	USD
CY2013Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	13902000	USD
CY2012Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	15104000	USD
CY2013Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-2500000	USD
CY2013Q1	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1113302000	USD
CY2012Q1	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	4654000	USD
CY2013Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3144000	USD
CY2012Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2973000	USD
CY2013Q1	us-gaap	Noninterest Expense NoninterestExpense	21527000	USD
CY2012Q1	us-gaap	Noninterest Expense NoninterestExpense	22452000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	5471000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-2968000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	5471000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	-2968000	USD
CY2013Q1	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1289000	USD
CY2012Q1	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1223000	USD
CY2013Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	4182000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-4191000	USD
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.30
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.30
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.30
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.30
CY2013Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-35000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	1004000	USD
CY2013Q1	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	-17000	USD
CY2012Q1	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	413000	USD
CY2013Q1	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Unrealized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent	-18000	USD
CY2012Q1	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Unrealized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent	591000	USD
CY2013Q1	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1453000	USD
CY2012Q1	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-101000	USD
CY2013Q1	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-596000	USD
CY2012Q1	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-41000	USD
CY2013Q1	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-857000	USD
CY2012Q1	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-60000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-875000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	531000	USD
CY2013Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	4596000	USD
CY2012Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-2437000	USD
CY2013Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	746000	USD
CY2012Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	801000	USD
CY2013Q1	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	106000	USD
CY2012Q1	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	123000	USD
CY2013Q1	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	53138000	USD
CY2012Q1	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	64140000	USD
CY2013Q1	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	57755000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	72729000	USD
CY2013Q1	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	5215000	USD
CY2012Q1	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	4635000	USD
CY2013Q1	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	634000	USD
CY2012Q1	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	3420000	USD
CY2013Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-414000	USD
CY2012Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-403000	USD
CY2013Q1	us-gaap	Share Based Compensation ShareBasedCompensation	14000	USD
CY2012Q1	us-gaap	Share Based Compensation ShareBasedCompensation	87000	USD
CY2013Q1	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	-1987000	USD
CY2012Q1	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	-2500000	USD
CY2013Q1	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	2165000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	11333000	USD
CY2013Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	18055000	USD
CY2012Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	17254000	USD
CY2013Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	231155000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	8359000	USD
CY2013Q1	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	240190000	USD
CY2012Q1	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	76819000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Federal Reserve Stock ProceedsFromSaleOfFederalReserveStock	1467000	USD
CY2013Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-26971000	USD
CY2012Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-20248000	USD
CY2013Q1	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	50000	USD
CY2012Q1	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	318000	USD
CY2013Q1	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	11842000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	5369000	USD
CY2013Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1123000	USD
CY2012Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	154000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	46666000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-24594000	USD
CY2013Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1037000	USD
CY2012Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	23089000	USD
CY2013Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	2927000	USD
CY2012Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	903000	USD
CY2013Q1	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-100000000	USD
CY2012Q1	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	15000000	USD
CY2013Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	185000	USD
CY2012Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	63000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-96221000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	38929000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-47390000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	25668000	USD
CY2013Q1	osbc	Interest Paid For Deposits InterestPaidForDeposits	2124000	USD
CY2012Q1	osbc	Interest Paid For Deposits InterestPaidForDeposits	3394000	USD
CY2013Q1	us-gaap	Interest Paid InterestPaid	225000	USD
CY2012Q1	us-gaap	Interest Paid InterestPaid	243000	USD
CY2013Q1	osbc	Non Cash Transfer Of Loans To Other Real Estate Owned NonCashTransferOfLoansToOtherRealEstateOwned	6985000	USD
CY2012Q1	osbc	Non Cash Transfer Of Loans To Other Real Estate Owned NonCashTransferOfLoansToOtherRealEstateOwned	15918000	USD
CY2013Q1	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	261000	USD
CY2012Q1	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	245000	USD
CY2011Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	50949000	USD
CY2012Q1	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	76617000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	74002000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	531000	USD
CY2012Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	87000	USD
CY2012Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	63000	USD
CY2012Q1	osbc	Preferred Stock Dividends And Other Adjustments Equity Impact PreferredStockDividendsAndOtherAdjustmentsEquityImpact	978000	USD
CY2012Q1	us-gaap	Stockholders Equity StockholdersEquity	70611000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-875000	USD
CY2013Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	14000	USD
CY2013Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	185000	USD
CY2013Q1	osbc	Preferred Stock Dividends And Other Adjustments Equity Impact PreferredStockDividendsAndOtherAdjustmentsEquityImpact	511000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	613000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	372000	USD
CY2013Q1	us-gaap	Cash And Due From Banks CashAndDueFromBanks	17202000	USD
CY2012Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	44221000	USD
CY2013Q1	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	63915000	USD
CY2012Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	84286000	USD
CY2013Q1	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	81117000	USD
CY2012Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	128507000	USD
CY2013Q1	us-gaap	Available For Sale Securities AvailableForSaleSecurities	575746000	USD
CY2013Q1	dei	Entity Filer Category EntityFilerCategory	Smaller Reporting Company
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	579886000	USD
CY2013Q1	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	11202000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	11202000	USD
CY2013Q1	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	6381000	USD
CY2012Q4	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	9571000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1150050000	USD
CY2013Q1	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	38634000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	38597000	USD
CY2013Q1	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1074668000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1111453000	USD
CY2013Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	47356000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	47002000	USD
CY2013Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	65663000	USD
CY2012Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	72423000	USD
CY2013Q1	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	4469000	USD
CY2012Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	4116000	USD
CY2013Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2751000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3276000	USD
CY2013Q1	dei	Entity Registrant Name EntityRegistrantName	OLD SECOND BANCORP INC
CY2013Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000357173
CY2013Q1	dei	Document Type DocumentType	10-Q
CY2013Q1	dei	Document Period End Date DocumentPeriodEndDate	2013-03-31
CY2013Q1	dei	Amendment Flag AmendmentFlag	false
CY2013Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	13882910	shares
CY2013Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2013Q1	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	54610000	USD
CY2012Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	54203000	USD
CY2013Q1	us-gaap	Other Assets OtherAssets	30081000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	24160000	USD
CY2013Q1	us-gaap	Assets Assets	1954044000	USD
CY2012Q4	us-gaap	Assets Assets	2045799000	USD
CY2013Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	351328000	USD
CY2012Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	379451000	USD
CY2013Q1	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	865863000	USD
CY2012Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	826976000	USD
CY2013Q1	us-gaap	Time Deposits TimeDeposits	501065000	USD
CY2012Q4	us-gaap	Time Deposits TimeDeposits	510792000	USD
CY2013Q1	us-gaap	Deposits Deposits	1718256000	USD
CY2012Q4	us-gaap	Deposits Deposits	1717219000	USD
CY2013Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	20802000	USD
CY2012Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	17875000	USD
CY2012Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	100000000	USD
CY2013Q1	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	58378000	USD
CY2012Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	58378000	USD
CY2013Q1	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2012Q4	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2013Q1	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2012Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2013Q1	us-gaap	Other Liabilities OtherLiabilities	35254000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	34275000	USD
CY2013Q1	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2012Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2013Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2013Q1	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2013Q1	us-gaap	Liabilities Liabilities	1878190000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	1973247000	USD
CY2013Q1	us-gaap	Preferred Stock Value PreferredStockValue	72130000	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	71869000	USD
CY2013Q1	us-gaap	Common Stock Value CommonStockValue	18780000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	18729000	USD
CY2013Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	66109000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	66189000	USD
CY2013Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	16747000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	12048000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2202000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1327000	USD
CY2013Q1	us-gaap	Treasury Stock Value TreasuryStockValue	95710000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	94956000	USD
CY2013Q1	us-gaap	Stockholders Equity StockholdersEquity	75854000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	72552000	USD
CY2013Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1954044000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2045799000	USD
CY2013Q1	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2013Q1	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	6400000	USD
CY2013Q1	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	4800000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	582141000	USD
CY2013Q1	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	579489000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	7899000	USD
CY2013Q1	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	5862000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	10154000	USD
CY2013Q1	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	9605000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	10976000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	25685000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	37930000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	60064000	USD
CY2013Q1	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Amortized Cost Basis AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis	134655000	USD
CY2013Q1	osbc	Available For Sale Securities Debt Maturities Within One Year Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCostWeightedAverageYield	0.0161	pure
CY2013Q1	osbc	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostWeightedAverageYield	0.0197	pure
CY2013Q1	osbc	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostWeightedAverageYield	0.0303	pure
CY2013Q1	osbc	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostWeightedAverageYield	0.0293	pure
CY2013Q1	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Weighted Average Yield AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateWeightedAverageYield	0.0267	pure
CY2013Q1	osbc	Available For Sale Securities Weighted Average Yield AvailableForSaleSecuritiesWeightedAverageYield	0.0198	pure
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	10984000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	26456000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	38730000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	60191000	USD
CY2013Q1	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Fair Value AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue	136361000	USD
CY2012Q4	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	32	security
CY2013Q1	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	31	security
CY2013Q1	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	3	security
CY2012Q4	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	3	security
CY2012Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	35	security
CY2013Q1	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	34	security
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	2140000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	134000	USD
CY2012Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	96000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	6000	USD
CY2012Q1	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	1000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	140000	USD
CY2013Q1	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	2293000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	8014000	USD
CY2013Q1	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	7312000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	10154000	USD
CY2013Q1	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	9605000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	155213000	USD
CY2013Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	179939000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	12300000	USD
CY2013Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	11659000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	167513000	USD
CY2013Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	191598000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1149944000	USD
CY2013Q1	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1113066000	USD
CY2013Q1	osbc	Loans And Leases Receivable Deferred Income Expense Net LoansAndLeasesReceivableDeferredIncomeExpenseNet	-236000	USD
CY2012Q4	osbc	Loans And Leases Receivable Deferred Income Expense Net LoansAndLeasesReceivableDeferredIncomeExpenseNet	-106000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	6529000	USD
CY2013Q1	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	10727000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	6357000	USD
CY2013Q1	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	139000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	89000	USD
CY2013Q1	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	277000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	12975000	USD
CY2013Q1	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	11143000	USD
CY2013Q1	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1037263000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1059556000	USD
CY2013Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	64896000	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
CY2013Q1	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	277000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	60679000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	28306000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	52305000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	77649000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	25344000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	63554000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	88985000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	100213000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	36659000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	77940000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	36433000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	114373000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	6259000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5038000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	56492000	USD
CY2012Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	75824000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	26825000	USD
CY2012Q1	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	131177000	USD
CY2013Q1	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	83317000	USD
CY2012Q1	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	55353000	USD
CY2012Q1	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	97000	USD
CY2013Q1	osbc	Financing Receivable Modification Number Of Contracts FinancingReceivableModificationNumberOfContracts	1	contract
CY2013Q1	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment1 FinancingReceivableModificationsPreModificationRecordedInvestment1	137000	USD
CY2013Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment1 FinancingReceivableModificationsPostModificationRecordedInvestment1	137000	USD
CY2012Q1	osbc	Financing Receivable Modification Number Of Contracts FinancingReceivableModificationNumberOfContracts	2	contract
CY2012Q1	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment1 FinancingReceivableModificationsPreModificationRecordedInvestment1	538000	USD
CY2012Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment1 FinancingReceivableModificationsPostModificationRecordedInvestment1	568000	USD
CY2013Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts FinancingReceivableModificationsSubsequentDefaultNumberOfContracts	1	contract
CY2013Q1	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment FinancingReceivableModificationsSubsequentDefaultRecordedInvestment	155000	USD
CY2013Q1	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1523000	USD
CY2013Q1	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	-4060000	USD
CY2013Q1	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5038000	USD
CY2013Q1	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	33596000	USD
CY2013Q1	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	77649000	USD
CY2013Q1	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1035653000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	51997000	USD
CY2012Q1	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	12122000	USD
CY2012Q1	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	-1651000	USD
CY2012Q1	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	9647000	USD
CY2012Q1	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	37963000	USD
CY2012Q1	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1322348000	USD
CY2012Q1	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	123728000	USD
CY2012Q1	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1198620000	USD
CY2011Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	93290000	USD
CY2012Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	101680000	USD
CY2013Q1	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	6985000	USD
CY2012Q1	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	15918000	USD
CY2013Q1	us-gaap	Real Estate Improvements RealEstateImprovements	50000	USD
CY2012Q1	us-gaap	Real Estate Improvements RealEstateImprovements	318000	USD
CY2013Q1	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	11661000	USD
CY2012Q1	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	5346000	USD
CY2013Q1	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	2134000	USD
CY2012Q1	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	2500000	USD
CY2011Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	23462000	USD
CY2012Q1	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	23994000	USD
CY2012Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	31454000	USD
CY2013Q1	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	30966000	USD
CY2013Q1	osbc	Real Estate Owned Valuation Allowance Other Adjustments RealEstateOwnedValuationAllowanceOtherAdjustments	147000	USD
CY2013Q1	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	1699000	USD
CY2012Q1	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	2154000	USD
CY2013Q1	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	3097000	USD
CY2012Q1	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	3452000	USD
CY2013Q1	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	230771000	USD
CY2012Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	216305000	USD
CY2013Q1	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	303385000	USD
CY2012Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	286860000	USD
CY2013Q1	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	331707000	USD
CY2012Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	323811000	USD
CY2013Q1	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	312193000	USD
CY2012Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	318844000	USD
CY2013Q1	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	188872000	USD
CY2012Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	191948000	USD
CY2012Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	221753000	USD
CY2013Q1	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	124680000	USD
CY2013Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1908332	shares
CY2013Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	200868	shares
CY2013Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	14000	USD
CY2012Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	87000	USD
CY2013Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14076114	shares
CY2013Q1	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13947454	shares
CY2012Q1	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13855339	shares
CY2013Q1	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	210069	shares
CY2012Q1	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	340804	shares
CY2013Q1	us-gaap	Undistributed Earnings UndistributedEarnings	4182000	USD
CY2012Q1	us-gaap	Undistributed Earnings UndistributedEarnings	-4191000	USD
CY2013Q1	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	0.30
CY2012Q1	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.30
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14043545	shares
CY2013Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14157523	shares
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14196143	shares
CY2013Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	4182000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-4191000	USD
CY2013Q1	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0511	pure
CY2013Q1	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1433	pure
CY2013Q1	us-gaap	Capital Capital	193639000	USD
CY2012Q4	us-gaap	Capital Capital	189465000	USD
CY2013Q1	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	108103000	USD
CY2012Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	111286000	USD
CY2012Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1362	pure
CY2013Q1	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2012Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2013Q1	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	100877000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	94816000	USD
CY2013Q1	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	54090000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	55692000	USD
CY2013Q1	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0746	pure
CY2012Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0681	pure
CY2013Q1	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0400	pure
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0400	pure
CY2013Q1	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	100877000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	94816000	USD
CY2013Q1	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	78964000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	78199000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0485	pure
CY2013Q1	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2013Q1	osbc	Dividend Restrictions Number Of Previous Years Retained Profit DividendRestrictionsNumberOfPreviousYearsRetainedProfit	P2Y
CY2013Q1	us-gaap	Preferred Stock Amount Of Preferred Dividends In Arrears PreferredStockAmountOfPreferredDividendsInArrears	10200000	USD
CY2013Q1	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	6000	USD
CY2013Q1	us-gaap	Transfer Of Investments TransferOfInvestments	5329000	USD
CY2013Q1	osbc	Fair Value Difference On Recapture Of Restricted Stock FairValueDifferenceOnRecaptureOfRestrictedStock	43000	USD
CY2013Q1	osbc	Gain On Recapture Of Restricted Stock GainOnRecaptureOfRestrictedStock	612000	USD
CY2013Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2009Q1	us-gaap	Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants	73000000	USD
CY2012Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	14084328	shares
CY2013Q1	osbc	Fair Value Measurement Significant Transfers Between Levels FairValueMeasurementSignificantTransfersBetweenLevels	0	USD
CY2012Q1	osbc	Fair Value Measurement Significant Transfers Between Levels FairValueMeasurementSignificantTransfersBetweenLevels	0	USD
CY2013Q1	osbc	Commitments To Borrower Whose Loans Were Classified As Impaired CommitmentsToBorrowerWhoseLoansWereClassifiedAsImpaired	0	USD
CY2012Q1	osbc	Number Of Tdr Default Activities NumberOfTDRDefaultActivities	0	item
CY2012Q1	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	0	USD
CY2013Q1	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	2622000	USD
CY2012Q1	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	1968000	USD
CY2012Q1	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	47610000	USD
CY2013Q1	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	1000	USD
CY2013Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.00
CY2013Q1	us-gaap	Contractual Obligation ContractualObligation	9986000	USD
CY2012Q4	us-gaap	Contractual Obligation ContractualObligation	10646000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	6400000	USD
CY2013Q1	osbc	Recapture Of Restricted Stock RecaptureOfRestrictedStock	612000	USD
CY2012Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	4800000	USD

Files In Submission

Name	View Source	Status
0001104659-13-041910-index-headers.html	Edgar Link	pending
0001104659-13-041910-index.html	Edgar Link	pending
0001104659-13-041910.txt	Edgar Link	pending
0001104659-13-041910-xbrl.zip	Edgar Link	pending
a13-8229_110q.htm	Edgar Link	pending
a13-8229_1ex31d1.htm	Edgar Link	pending
a13-8229_1ex31d2.htm	Edgar Link	pending
a13-8229_1ex32d1.htm	Edgar Link	pending
a13-8229_1ex32d2.htm	Edgar Link	pending
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Financial_Report.xls	Edgar Link	pending
osbc-20130331.xml	Edgar Link	completed
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osbc-20130331_cal.xml	Edgar Link	unprocessable
osbc-20130331_def.xml	Edgar Link	unprocessable
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osbc-20130331_pre.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
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$OSBC
Old Second Bancorp Inc Stock $osbc

2013 Q1 Form 10-Q Financial Statement

#000110465913041910 Filed on May 15, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC Old Second Bancorp Inc Stock $osbc

2013 Q1 Form 10-Q Financial Statement

#000110465913041910 Filed on May 15, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC
Old Second Bancorp Inc Stock $osbc