$OSBC
Old Second Bancorp Inc Stock $osbc

$osbc Overview Financials Valuation SEC Filings Company Website

2013 Q4 Form 10-Q Financial Statement

#000110465913083619 Filed on November 12, 2013

Income Statement

Concept	2013 Q4	2013 Q3	2012 Q3
Revenue		$17.72M	$18.33M
YoY Change		-3.32%	-12.89%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.170M	$1.200M	$1.180M
YoY Change	-7.14%	1.69%	-8.53%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$3.435M	$3.698M
YoY Change		-7.11%	-27.82%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	-$30.00K	$2.927M	$120.0K
YoY Change	-101.97%	2339.17%	-108.63%
Income Tax	-$250.0K	-$70.00M	$0.00
% Of Pretax Income		-2391.42%	0.0%
Net Earnings	$210.0K	$72.92M	$120.0K
YoY Change	-86.18%	60670.0%	-108.63%
Net Earnings / Revenue		411.44%	0.65%
Basic Earnings Per Share		$5.08	-$0.08
Diluted Earnings Per Share	$15.09K	$5.08	-$0.08
COMMON SHARES
Basic Shares Outstanding	13.92M shares	13.89M shares	14.08M shares
Diluted Shares Outstanding		14.10M shares	14.21M shares

Balance Sheet

Concept	2013 Q4	2013 Q3	2012 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$46.01M	$46.39M	$48.51M
YoY Change	-2.12%	-4.36%	-6.71%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$75.30M	$78.90M
YoY Change	8266.67%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.004B	$2.033B	$1.903B
YoY Change	-2.04%	6.8%	-1.92%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$27.60M	$75.70M	$1.700M
YoY Change	-76.59%	4352.94%	-75.36%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$27.60M	$75.70M	$1.700M
YoY Change	-76.59%	4352.94%	-75.36%
LONG-TERM LIABILITIES
Long-Term Debt	$103.9M	$103.9M	$103.9M
YoY Change	0.0%	0.0%	0.0%
Other Long-Term Liabilities	$42.80M	$38.00M	$30.10M
YoY Change	24.78%	26.25%	27.54%
Total Long-Term Liabilities	$146.7M	$141.9M	$134.0M
YoY Change	6.15%	5.9%	5.1%
TOTAL LIABILITIES
Total Short-Term Liabilities	$27.60M	$75.70M	$1.700M
Total Long-Term Liabilities	$146.7M	$141.9M	$134.0M
Total Liabilities	$1.856B	$1.891B	$1.833B
YoY Change	-5.92%	3.17%	-1.6%
SHAREHOLDERS EQUITY
Retained Earnings	$92.55M	$92.61M	$11.80M
YoY Change	668.17%	685.18%
Common Stock	$18.83M	$18.83M	$18.73M
YoY Change	0.54%	0.54%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$95.80M	$95.80M	$94.96M
YoY Change	0.89%	0.89%
Treasury Stock Shares	4.913M shares	4.913M shares	4.645M shares
Shareholders Equity	$147.7M	$142.0M	$70.74M
YoY Change
Total Liabilities & Shareholders Equity	$2.004B	$2.033B	$1.903B
YoY Change	-2.04%	6.8%	-1.92%

Cashflow Statement

Concept	2013 Q4	2013 Q3	2012 Q3
OPERATING ACTIVITIES
Net Income	$210.0K	$72.92M	$120.0K
YoY Change	-86.18%	60670.0%	-108.63%
Depreciation, Depletion And Amortization	$1.170M	$1.200M	$1.180M
YoY Change	-7.14%	1.69%	-8.53%
Cash From Operating Activities	$15.54M	$4.180M	$10.77M
YoY Change	6.29%	-61.19%	15.06%
INVESTING ACTIVITIES
Capital Expenditures	-$260.0K	-$270.0K	-$70.00K
YoY Change	-61.76%	285.71%	-75.86%
Acquisitions
YoY Change
Other Investing Activities	-$8.540M	-$19.31M	$16.67M
YoY Change	-90.93%	-215.84%	-50.03%
Cash From Investing Activities	-$8.800M	-$19.58M	$16.60M
YoY Change	-90.72%	-217.95%	-49.8%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-39.15M	27.62M	-85.15M
YoY Change	-128.7%	-132.44%	115.3%
NET CHANGE
Cash From Operating Activities	15.54M	4.180M	10.77M
Cash From Investing Activities	-8.800M	-19.58M	16.60M
Cash From Financing Activities	-39.15M	27.62M	-85.15M
Net Change In Cash	-32.41M	12.22M	-57.78M
YoY Change	-157.61%	-121.15%	-2106.25%
FREE CASH FLOW
Cash From Operating Activities	$15.54M	$4.180M	$10.77M
Capital Expenditures	-$260.0K	-$270.0K	-$70.00K
Free Cash Flow	$15.80M	$4.450M	$10.84M
YoY Change	3.27%	-58.95%	12.33%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2013Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	373478000	USD
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CY2012Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	4800000	USD
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CY2013Q3	osbc	Available For Sale Securities Gross Unrealized Gain Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	2563000	USD
CY2012Q4	osbc	Available For Sale Securities Gross Unrealized Loss Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments	10154000	USD
CY2013Q3	osbc	Available For Sale Securities Gross Unrealized Loss Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments	15576000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	579886000	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	772000	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	4425000	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	29271000	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	10995000	USD
CY2013Q3	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Amortized Cost Basis AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis	45463000	USD
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CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	28885000	USD
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CY2013Q3	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	35	security
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CY2012Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1208289000	USD
CY2012Q3	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	104240000	USD
CY2012Q3	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1104049000	USD
CY2013Q3	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	3015000	USD
CY2013Q3	us-gaap	Real Estate Improvements RealEstateImprovements	10000	USD
CY2013Q3	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	11463000	USD
CY2013Q3	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	1961000	USD
CY2012Q3	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	7594000	USD
CY2012Q3	us-gaap	Real Estate Improvements RealEstateImprovements	131000	USD
CY2012Q3	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	4829000	USD
CY2012Q3	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	4474000	USD
	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	14196000	USD
	us-gaap	Real Estate Improvements RealEstateImprovements	60000	USD
	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	30928000	USD
	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	6685000	USD
	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	26944000	USD
	us-gaap	Real Estate Improvements RealEstateImprovements	646000	USD
	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	20517000	USD
	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	12270000	USD
CY2013Q3	osbc	Real Estate Owned Valuation Allowance Provision Net Of Adjustment RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment	1961000	USD
CY2012Q3	osbc	Real Estate Owned Valuation Allowance Provision Net Of Adjustment RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment	4474000	USD
	osbc	Real Estate Owned Valuation Allowance Provision Net Of Adjustment RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment	6537000	USD
	osbc	Real Estate Owned Valuation Allowance Provision Net Of Adjustment RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment	12101000	USD
CY2012Q3	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	2657000	USD
	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	13305000	USD
	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	6446000	USD
CY2013Q3	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	7571000	USD
	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	-99000	USD
	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	169000	USD
CY2013Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	608000	USD
CY2012Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	20000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	1175000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	398000	USD
CY2012Q3	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	2071000	USD
CY2013Q3	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	1500000	USD
	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	4555000	USD
	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	5886000	USD
	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	2930000	USD
	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	974000	USD
CY2012Q3	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	840000	USD
CY2013Q3	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	309000	USD
CY2013Q3	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	2544000	USD
CY2012Q3	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	5685000	USD
	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	8943000	USD
	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	14659000	USD
CY2013Q2	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	59465000	USD
CY2013Q3	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	49066000	USD
CY2012Q2	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	89671000	USD
CY2012Q3	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	88093000	USD
CY2012Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	72423000	USD
CY2011Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	93290000	USD
CY2013Q2	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	30487000	USD
CY2013Q3	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	24587000	USD
CY2012Q2	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	27469000	USD
CY2012Q3	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	29286000	USD
CY2012Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	31454000	USD
CY2011Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	23462000	USD
CY2013Q3	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	373499000	USD
CY2013Q3	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	227823000	USD
CY2013Q3	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	272632000	USD
CY2013Q3	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	309066000	USD
CY2013Q3	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	299632000	USD
CY2013Q3	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	190471000	USD
CY2013Q3	us-gaap	Deposits Deposits	1673123000	USD
CY2012Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	379451000	USD
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
CY2012Q4	us-gaap	Deposits Deposits	1717219000	USD
CY2013Q3	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	809521000	USD
CY2012Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	221753000	USD
CY2013Q3	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	179597000	USD
CY2013Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	5500000	USD
CY2013Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1908332	shares
CY2013Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	45368	shares
CY2013Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	57000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	123000	USD
CY2012Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	67000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	220000	USD
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14084328	shares
CY2012Q3	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13883008	shares
CY2012Q3	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	327920	shares
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	120000	USD
CY2012Q3	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1255000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1135000	USD
CY2012Q3	us-gaap	Undistributed Earnings UndistributedEarnings	-1135000	USD
CY2012Q3	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.08
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.08
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14210928	shares
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-1135000	USD
	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	332198	shares
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.08
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14070783	shares
	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13873819	shares
	us-gaap	Net Income Loss NetIncomeLoss	-1596000	USD
	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	3716000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-5312000	USD
	us-gaap	Undistributed Earnings UndistributedEarnings	-5312000	USD
	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.37
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.37
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14206017	shares
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-5312000	USD
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.37
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	13947606	shares
	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13895136	shares
	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	217107	shares
	us-gaap	Net Income Loss NetIncomeLoss	81872000	USD
	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	3917000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	77955000	USD
	us-gaap	Undistributed Earnings UndistributedEarnings	77955000	USD
	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	5.52
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.52
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14112243	shares
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	77955000	USD
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.52
CY2013Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	13885884	shares
CY2013Q3	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13870884	shares
CY2013Q3	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	231152	shares
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	72924000	USD
CY2013Q3	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1323000	USD
CY2013Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	71601000	USD
CY2013Q3	us-gaap	Undistributed Earnings UndistributedEarnings	71601000	USD
CY2013Q3	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	5.08
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.08
CY2013Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14102036	shares
CY2013Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	71601000	USD
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.08
CY2013Q3	osbc	Fair Value Measurement Significant Transfers Between Levels FairValueMeasurementSignificantTransfersBetweenLevels	0	USD
CY2013Q3	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1515	pure
CY2012Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1362	pure
CY2013Q3	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
CY2013Q3	us-gaap	Capital Capital	198822000	USD
CY2012Q4	us-gaap	Capital Capital	189466000	USD
CY2013Q3	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	104989000	USD
CY2012Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	111287000	USD
CY2013Q3	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	132129000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	94817000	USD
CY2013Q3	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	52484000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	55693000	USD
CY2013Q3	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1007	pure
CY2012Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0681	pure
CY2013Q3	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
CY2013Q3	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	132129000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	94817000	USD
CY2013Q3	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	74334000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	78200000	USD
CY2013Q3	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0711	pure
CY2012Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0485	pure
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013Q3	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
CY2013Q3	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
	osbc	Dividend Restrictions Number Of Previous Years Retained Profit DividendRestrictionsNumberOfPreviousYearsRetainedProfit	P2Y
CY2013Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	5456000	USD
CY2012Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	4116000	USD
CY2013Q3	us-gaap	Contractual Obligation ContractualObligation	9509000	USD
CY2012Q4	us-gaap	Contractual Obligation ContractualObligation	10646000	USD
CY2009Q1	us-gaap	Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants	73000000	USD
	dei	Entity Registrant Name EntityRegistrantName	OLD SECOND BANCORP INC
	dei	Entity Central Index Key EntityCentralIndexKey	0000357173
	dei	Document Type DocumentType	10-Q
	dei	Document Period End Date DocumentPeriodEndDate	2013-09-30
	dei	Amendment Flag AmendmentFlag	false
CY2013Q3	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	80072000	USD
CY2012Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	128507000	USD
	dei	Entity Filer Category EntityFilerCategory	Smaller Reporting Company
CY2013Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	13917108	shares
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
CY2013Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	47486000	USD
CY2012Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	44221000	USD
CY2013Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	32586000	USD
CY2012Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	84286000	USD
CY2013Q3	us-gaap	Other Liabilities OtherLiabilities	38029000	USD
CY2013Q3	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2012Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2013Q3	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	10292000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	11202000	USD
CY2013Q3	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	3129000	USD
CY2012Q4	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	9571000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1111453000	USD
CY2013Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	46392000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	47002000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1702000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3276000	USD
CY2013Q3	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	55005000	USD
CY2012Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	54203000	USD
CY2013Q3	us-gaap	Other Assets OtherAssets	23137000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	23232000	USD
CY2013Q3	us-gaap	Assets Assets	2032788000	USD
CY2012Q4	us-gaap	Assets Assets	2045799000	USD
CY2012Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	826976000	USD
CY2013Q3	us-gaap	Time Deposits TimeDeposits	490103000	USD
CY2012Q4	us-gaap	Time Deposits TimeDeposits	510792000	USD
CY2013Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	20719000	USD
CY2012Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	17875000	USD
CY2013Q3	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
CY2012Q4	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	34275000	USD
CY2013Q3	us-gaap	Liabilities Liabilities	1890749000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	1973247000	USD
CY2013Q3	us-gaap	Preferred Stock Value PreferredStockValue	72667000	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	71869000	USD
CY2013Q3	us-gaap	Common Stock Value CommonStockValue	18830000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	18729000	USD
CY2013Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	66168000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	66189000	USD
CY2013Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	92612000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	12048000	USD
CY2013Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-12435000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1327000	USD
CY2013Q3	us-gaap	Treasury Stock Value TreasuryStockValue	95803000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	94956000	USD
CY2013Q3	us-gaap	Stockholders Equity StockholdersEquity	142039000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	72552000	USD
CY2013Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2032788000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2045799000	USD
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CY2013Q3	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2012Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2013Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2013Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2013Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	73000	shares
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CY2013Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
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CY2013Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	18829734	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	18729134	shares
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CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	14084328	shares
CY2013Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	4912626	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	4644806	shares
CY2013Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	14327000	USD
CY2012Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	16193000	USD
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	43153000	USD
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	51476000	USD
CY2013Q3	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	38000	USD
CY2012Q3	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	68000	USD
	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	124000	USD
	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	201000	USD
CY2013Q3	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	3113000	USD
CY2012Q3	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	1868000	USD
	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	8109000	USD
	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	5222000	USD
CY2013Q3	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	148000	USD
CY2012Q3	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	98000	USD
	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	441000	USD
	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	303000	USD
CY2013Q3	us-gaap	Dividend Income Operating DividendIncomeOperating	76000	USD
CY2012Q3	us-gaap	Dividend Income Operating DividendIncomeOperating	77000	USD
	us-gaap	Dividend Income Operating DividendIncomeOperating	228000	USD
	us-gaap	Dividend Income Operating DividendIncomeOperating	228000	USD
CY2013Q3	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	22000	USD
CY2012Q3	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	29000	USD
	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	91000	USD
	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	89000	USD
CY2013Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	17724000	USD
CY2012Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	18333000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	52146000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	57519000	USD
CY2013Q3	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	206000	USD
CY2012Q3	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	253000	USD
	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	655000	USD
	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	807000	USD
CY2013Q3	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	1674000	USD
CY2012Q3	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	1973000	USD
	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	5327000	USD
	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	6920000	USD
CY2013Q3	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	1000	USD
CY2012Q3	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	1000	USD
	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	2000	USD
	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	2000	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	24000	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	4000	USD
CY2013Q3	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1336000	USD
CY2012Q3	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1243000	USD
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	3937000	USD
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	3660000	USD
	osbc	Death Claim On Bank Owned Life Insurance DeathClaimOnBankOwnedLifeInsurance	396000	USD
CY2013Q3	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	209000	USD
CY2012Q3	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	223000	USD
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	610000	USD
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	684000	USD
CY2013Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	4000	USD
CY2012Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	5000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	12000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	13000	USD
CY2013Q3	us-gaap	Interest Expense InterestExpense	3435000	USD
CY2012Q3	us-gaap	Interest Expense InterestExpense	3698000	USD
	us-gaap	Interest Expense InterestExpense	10567000	USD
	us-gaap	Interest Expense InterestExpense	12090000	USD
CY2013Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	14289000	USD
CY2012Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	14635000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	41579000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	45429000	USD
CY2013Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	16039000	USD
CY2012Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	14635000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	47629000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	39145000	USD
CY2013Q3	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	1494000	USD
CY2012Q3	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	1489000	USD
	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	4666000	USD
	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	4603000	USD
CY2013Q3	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	1904000	USD
CY2012Q3	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	1982000	USD
	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	5379000	USD
	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	5706000	USD
CY2013Q3	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	183000	USD
CY2012Q3	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	350000	USD
	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	680000	USD
	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	957000	USD
CY2013Q3	us-gaap	Servicing Fees Net ServicingFeesNet	235000	USD
CY2012Q3	us-gaap	Servicing Fees Net ServicingFeesNet	-155000	USD
	us-gaap	Servicing Fees Net ServicingFeesNet	1222000	USD
	us-gaap	Servicing Fees Net ServicingFeesNet	-365000	USD
CY2013Q3	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	814000	USD
CY2012Q3	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	2504000	USD
	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	4601000	USD
	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	7509000	USD
CY2013Q3	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-7000	USD
CY2012Q3	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	513000	USD
	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	2191000	USD
	osbc	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	6537000	USD
	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	1306000	USD
CY2013Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	419000	USD
CY2012Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	425000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1198000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1246000	USD
CY2013Q3	osbc	Death Benefit Realized On Bank Owned Life Insurance DeathBenefitRealizedOnBankOwnedLifeInsurance	6000	USD
	osbc	Death Benefit Realized On Bank Owned Life Insurance DeathBenefitRealizedOnBankOwnedLifeInsurance	381000	USD
CY2013Q3	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	873000	USD
CY2012Q3	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	788000	USD
	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	2565000	USD
	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	2661000	USD
CY2013Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1549000	USD
CY2012Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1592000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4434000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4257000	USD
CY2013Q3	us-gaap	Noninterest Income NoninterestIncome	8387000	USD
CY2012Q3	us-gaap	Noninterest Income NoninterestIncome	10348000	USD
	us-gaap	Noninterest Income NoninterestIncome	29466000	USD
	us-gaap	Noninterest Income NoninterestIncome	31208000	USD
CY2013Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	9299000	USD
CY2012Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	8963000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	27508000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	26835000	USD
CY2013Q3	us-gaap	Occupancy Net OccupancyNet	1266000	USD
CY2012Q3	us-gaap	Occupancy Net OccupancyNet	1242000	USD
	us-gaap	Occupancy Net OccupancyNet	3787000	USD
	us-gaap	Occupancy Net OccupancyNet	3684000	USD
CY2013Q3	us-gaap	Equipment Expense EquipmentExpense	1026000	USD
CY2012Q3	us-gaap	Equipment Expense EquipmentExpense	1078000	USD
	us-gaap	Equipment Expense EquipmentExpense	3274000	USD
	us-gaap	Equipment Expense EquipmentExpense	3416000	USD
CY2013Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	987000	USD
CY2012Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1029000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3046000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3058000	USD
CY2013Q3	us-gaap	General Insurance Expense GeneralInsuranceExpense	489000	USD
CY2012Q3	us-gaap	General Insurance Expense GeneralInsuranceExpense	851000	USD
	us-gaap	General Insurance Expense GeneralInsuranceExpense	1829000	USD
	us-gaap	General Insurance Expense GeneralInsuranceExpense	2538000	USD
CY2013Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	524000	USD
CY2012Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	420000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1574000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	865000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5000	USD
CY2013Q3	us-gaap	Advertising Expense AdvertisingExpense	347000	USD
CY2012Q3	us-gaap	Advertising Expense AdvertisingExpense	400000	USD
	us-gaap	Advertising Expense AdvertisingExpense	841000	USD
	us-gaap	Advertising Expense AdvertisingExpense	982000	USD
CY2013Q3	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	366000	USD
CY2012Q3	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	388000	USD
	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1072000	USD
	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1183000	USD
CY2013Q3	us-gaap	Legal Fees LegalFees	615000	USD
CY2012Q3	us-gaap	Legal Fees LegalFees	760000	USD
	us-gaap	Legal Fees LegalFees	1424000	USD
	us-gaap	Legal Fees LegalFees	2215000	USD
CY2013Q3	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	3461000	USD
CY2012Q3	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	6545000	USD
	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	11092000	USD
	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	17987000	USD
CY2013Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3119000	USD
CY2012Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3187000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	9773000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	9186000	USD
CY2013Q3	us-gaap	Noninterest Expense NoninterestExpense	21499000	USD
CY2012Q3	us-gaap	Noninterest Expense NoninterestExpense	24863000	USD
	us-gaap	Noninterest Expense NoninterestExpense	65220000	USD
	us-gaap	Noninterest Expense NoninterestExpense	71949000	USD
CY2013Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2927000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	120000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	11875000	USD
CY2012Q3	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-513000	USD
	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-2191000	USD
	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1306000	USD
CY2013Q3	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	3000	USD
CY2012Q3	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-208000	USD
	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-899000	USD
	osbc	Other Comprehensive Income Available Forsale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-532000	USD
CY2013Q3	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	4000	USD
CY2012Q3	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-305000	USD
	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-1292000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1596000	USD
CY2013Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69997000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69997000	USD
CY2013Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-3411000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	2908000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-16780000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3255000	USD
CY2012Q3	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	1194000	USD
	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	-6913000	USD
	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	1335000	USD
CY2013Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2006000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1714000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-9867000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1920000	USD
CY2013Q3	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	7000	USD
	osbc	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	12101000	USD
	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-774000	USD
CY2013Q3	osbc	Other Comprehensive Income Available For Sale Securities Unrealized Holding Gain Loss Net Reclassification Adjustment For Amounts Realized After Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	-2002000	USD
CY2012Q3	osbc	Other Comprehensive Income Available For Sale Securities Unrealized Holding Gain Loss Net Reclassification Adjustment For Amounts Realized After Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	1409000	USD
	osbc	Other Comprehensive Income Available For Sale Securities Unrealized Holding Gain Loss Net Reclassification Adjustment For Amounts Realized After Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	-11159000	USD
	osbc	Other Comprehensive Income Available For Sale Securities Unrealized Holding Gain Loss Net Reclassification Adjustment For Amounts Realized After Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	1146000	USD
CY2013Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	70973000	USD
CY2012Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1529000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	70764000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-450000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2147000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2339000	USD
	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-81000	USD
	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	1315000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	151601000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	208710000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	160966000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	222590000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-101000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	815000	USD
	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	334000	USD
	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	2437000	USD
	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	4341000	USD
	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	4689000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	131000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-664000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	123000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	220000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	38175000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	65940000	USD
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-910000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	19715000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	28680000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	484112000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	185861000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	6000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	564372000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	353992000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-49885000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-115728000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	32103000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	20915000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1538000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	371000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	18380000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	35685000	USD
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	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-45000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	278000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	63000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-86530000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-43073000	USD
	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-48435000	USD
	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	21292000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	266000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-815000	USD
	osbc	Interest Paid For Deposits InterestPaidForDeposits	6144000	USD
	osbc	Interest Paid For Deposits InterestPaidForDeposits	8444000	USD
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	us-gaap	Interest Paid InterestPaid	702000	USD
	osbc	Non Cash Transfer Of Loans To Other Real Estate Owned NonCashTransferOfLoansToOtherRealEstateOwned	14196000	USD
	osbc	Non Cash Transfer Of Loans To Other Real Estate Owned NonCashTransferOfLoansToOtherRealEstateOwned	26944000	USD
	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	798000	USD
	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	748000	USD
CY2011Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	50949000	USD
CY2012Q3	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	72241000	USD
CY2013Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	510000	USD
CY2012Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	2968000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	74002000	USD
	us-gaap	Transfer Of Investments TransferOfInvestments	5329000	USD
CY2012Q3	us-gaap	Stockholders Equity StockholdersEquity	70741000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1146000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-11108000	USD
	osbc	Recapture Of Restricted Stock RecaptureOfRestrictedStock	612000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	220000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	123000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	63000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	278000	USD
	osbc	Preferred Stock Dividends And Other Adjustments Equity Impact PreferredStockDividendsAndOtherAdjustmentsEquityImpact	2968000	USD
	osbc	Preferred Stock Dividends And Other Adjustments Equity Impact PreferredStockDividendsAndOtherAdjustmentsEquityImpact	510000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	7776000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	803000	USD
	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
CY2013Q3	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	258101000	USD
	osbc	Fair Value Difference On Recapture Of Restricted Stock FairValueDifferenceOnRecaptureOfRestrictedStock	43000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	541000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	21382000	USD
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-2250000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	6400000	USD
	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	68230000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	121433000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	71618000	USD
CY2013Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	258101000	USD
	us-gaap	Held To Maturity Securities Unrecognized Holding Gains HeldToMaturitySecuritiesUnrecognizedHoldingGains	2320000	USD
CY2013Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	260421000	USD
	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	646000	USD
	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	60000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1049000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	13700000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	18236000	USD
CY2013Q3	osbc	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation	719000	USD
CY2012Q4	osbc	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation	679000	USD
CY2013Q3	osbc	Deferred Tax Assets Goodwill And Intangible Assets Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets	1484000	USD
CY2012Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets	965000	USD
CY2013Q3	osbc	Deferred Tax Assets Goodwill And Intangible Assets Goodwill DeferredTaxAssetsGoodwillAndIntangibleAssetsGoodwill	15645000	USD
CY2012Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Goodwill DeferredTaxAssetsGoodwillAndIntangibleAssetsGoodwill	16796000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	608000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	785000	USD
CY2013Q3	osbc	Deferred Tax Assets Other Real Estate Owned Write Downs DeferredTaxAssetsOtherRealEstateOwnedWriteDowns	11072000	USD
CY2012Q4	osbc	Deferred Tax Assets Other Real Estate Owned Write Downs DeferredTaxAssetsOtherRealEstateOwnedWriteDowns	16632000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	26370000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	20736000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	11434000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	10186000	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-74145000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1444000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1444000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	598000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	585000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	83074000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	87044000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	946000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1063000	USD
CY2013Q3	osbc	Deferred Tax Liabilities Accretion On Securities DeferredTaxLiabilitiesAccretionOnSecurities	13000	USD
CY2012Q4	osbc	Deferred Tax Liabilities Accretion On Securities DeferredTaxLiabilitiesAccretionOnSecurities	122000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	2415000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	1819000	USD
CY2013Q3	osbc	Deferred Tax Liabilities State Tax Benefits DeferredTaxLiabilitiesStateTaxBenefits	6982000	USD
CY2012Q4	osbc	Deferred Tax Liabilities State Tax Benefits DeferredTaxLiabilitiesStateTaxBenefits	7315000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	194000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	217000	USD
CY2013Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10550000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10536000	USD
CY2013Q3	osbc	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	72524000	USD
CY2012Q4	osbc	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	76508000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	8704000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	928000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2363000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	76508000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	78865000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	928000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2935000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-643000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-552000	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1195000	USD
	osbc	Deferred Income Tax Expense Benefit Provision For Loan Losses DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses	4536000	USD
	osbc	Deferred Income Tax Expense Benefit Provision For Loan Losses DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses	5731000	USD
	osbc	Deferred Income Tax Expense Benefit Deferred Compensation DeferredIncomeTaxExpenseBenefitDeferredCompensation	-40000	USD
	osbc	Deferred Income Tax Expense Benefit Deferred Compensation DeferredIncomeTaxExpenseBenefitDeferredCompensation	24000	USD
	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Intangible Assets DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets	-519000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4156000	USD
	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Intangible Assets DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets	-204000	USD
	osbc	Deferred Income Tax Expense Benefit Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost	177000	USD
	osbc	Deferred Income Tax Expense Benefit Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost	358000	USD
	osbc	Deferred Income Tax Expense Benefit Other Real Estate Owned Write Downs DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns	5560000	USD
	osbc	Deferred Income Tax Expense Benefit Other Real Estate Owned Write Downs DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns	-4358000	USD
	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Domestic DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic	-5634000	USD
	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Domestic DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic	-2384000	USD
	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards State And Local DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal	-1248000	USD
	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards State And Local DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal	-852000	USD
	osbc	Deferred Income Tax Expense Benefit Depreciation DeferredIncomeTaxExpenseBenefitDepreciation	-117000	USD
	osbc	Deferred Income Tax Expense Benefit Depreciation DeferredIncomeTaxExpenseBenefitDepreciation	-210000	USD
	osbc	Deferred Income Tax Expense Benefit Premiums And Discounts On Securities Net DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet	-109000	USD
	osbc	Deferred Income Tax Expense Benefit Premiums And Discounts On Securities Net DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet	85000	USD
	osbc	Deferred Income Tax Expense Benefit Mortgage Servicing Rights DeferredIncomeTaxExpenseBenefitMortgageServicingRights	596000	USD
	osbc	Deferred Income Tax Expense Benefit Mortgage Servicing Rights DeferredIncomeTaxExpenseBenefitMortgageServicingRights	55000	USD
	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Goodwill DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill	1151000	USD
	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Goodwill DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill	1134000	USD
	osbc	Deferred Income Tax Expense Benefit State Tax Benefits DeferredIncomeTaxExpenseBenefitStateTaxBenefits	-333000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-11108000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1146000	USD
	osbc	Deferred Income Tax Expense Benefit State Tax Benefits DeferredIncomeTaxExpenseBenefitStateTaxBenefits	154000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-558000	USD
	osbc	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	-36000	USD
	osbc	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	-728000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-70161000	USD
	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	183000	USD
	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	143000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-553000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-436000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	780000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-128000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	10000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	299000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-62000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-229000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	582141000	USD
CY2013Q3	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	5000	USD
CY2012Q3	osbc	Fair Value Measurement Significant Transfers Between Levels FairValueMeasurementSignificantTransfersBetweenLevels	0	USD
CY2013Q3	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	55000000	USD
CY2012Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	100000000	USD
CY2013Q3	us-gaap	Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred To Available For Sale Securities Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax	87000	USD
	us-gaap	Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred To Available For Sale Securities Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax	87000	USD
CY2013Q3	osbc	Other Comprehensive Income Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities Tax OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax	36000	USD
	osbc	Other Comprehensive Income Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities Tax OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax	36000	USD
CY2013Q3	us-gaap	Other Comprehensive Income Loss Transfers From Held To Maturity To Available For Sale Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax	51000	USD
	us-gaap	Other Comprehensive Income Loss Transfers From Held To Maturity To Available For Sale Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax	51000	USD
CY2013Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-1951000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1409000	USD
	osbc	Gain On Recapture Of Restricted Stock GainOnRecaptureOfRestrictedStock	612000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	70161000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	237154000	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	129000	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	35000	USD
	osbc	Bank Owned Life Insurance Taxable Income BankOwnedLifeInsuranceTaxableIncome	11400000	USD
CY2013Q3	osbc	Available For Sale Securities Transfers To Held To Maturity Securities Fair Value AvailableForSaleSecuritiesTransfersToHeldToMaturitySecuritiesFairValue	237200000	USD
CY2013Q3	osbc	Available For Sale Securities Transfers To Held To Maturity Securities Amortized Cost AvailableForSaleSecuritiesTransfersToHeldToMaturitySecuritiesAmortizedCost	245400000	USD
CY2013Q3	osbc	Available For Sale Securities Transfers To Held To Maturity Securities Unrealized Loss AvailableForSaleSecuritiesTransfersToHeldToMaturitySecuritiesUnrealizedLoss	8200000	USD
CY2013Q3	osbc	Held To Maturity Securities Number Of Purchases Made HeldToMaturitySecuritiesNumberOfPurchasesMade	2	item

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Old Second Bancorp Inc Stock $osbc

2013 Q4 Form 10-Q Financial Statement

#000110465913083619 Filed on November 12, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC Old Second Bancorp Inc Stock $osbc

2013 Q4 Form 10-Q Financial Statement

#000110465913083619 Filed on November 12, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC
Old Second Bancorp Inc Stock $osbc