$OSBC
Old Second Bancorp Inc Stock $osbc

$osbc Overview Financials Valuation SEC Filings Company Website

2013 Form 10-K Financial Statement

#000110465914013651 Filed on February 26, 2014

Income Statement

Concept	2013	2012 Q4	2012
Revenue	$69.04M		$75.08M
YoY Change	-8.05%		-12.11%
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	$2.794M	$1.260M	$3.074M
YoY Change	-9.11%	20.0%	-24.58%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$13.79M		$15.74M
YoY Change	-12.39%		-26.72%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$11.84M	$1.520M	-$72.00K
YoY Change	-16548.61%	-150.67%	-98.89%
Income Tax	-$70.24M	$0.00	$0.00
% Of Pretax Income	-593.11%	0.0%
Net Earnings	$82.09M	$1.520M	-$72.00K
YoY Change	-114106.94%	-150.67%	-98.89%
Net Earnings / Revenue	118.89%		-0.1%
Basic Earnings Per Share	$5.45		-$0.36
Diluted Earnings Per Share	$5.45	$108.0K	-$0.36
COMMON SHARES
Basic Shares Outstanding	13.94M shares	14.08M shares	14.07M shares
Diluted Shares Outstanding	14.11M shares		14.21M shares

Balance Sheet

Concept	2013	2012 Q4	2012
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	$46.00M	$47.00M	$47.00M
YoY Change	-2.13%	-6.88%	-6.93%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$75.30M	$900.0K	$900.0K
YoY Change	8266.67%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.004B	$2.046B	$2.046B
YoY Change	-2.04%	5.38%	5.38%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$27.60M	$117.9M	$117.9M
YoY Change	-76.59%	13000.0%	13000.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$27.60M	$117.9M	$117.9M
YoY Change	-76.59%	13000.0%	13000.0%
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	$34.30M	$34.30M
YoY Change	24.78%	56.62%	56.62%
Total Long-Term Liabilities	$146.7M	$138.2M	$138.2M
YoY Change	6.15%	9.86%	9.86%
TOTAL LIABILITIES
Total Short-Term Liabilities	$27.60M	$117.9M	$117.9M
Total Long-Term Liabilities	$146.7M	$138.2M	$138.2M
Total Liabilities	$1.856B	$1.973B	$1.973B
YoY Change	-5.92%	5.67%	5.67%
SHAREHOLDERS EQUITY
Retained Earnings		$12.05M
YoY Change		-29.57%
Common Stock		$18.73M
YoY Change		0.54%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$94.96M
YoY Change		0.07%
Treasury Stock Shares		4.645M shares
Shareholders Equity	$147.7M	$72.55M	$72.60M
YoY Change
Total Liabilities & Shareholders Equity	$2.004B	$2.046B	$2.046B
YoY Change	-2.04%	5.38%	5.38%

Cashflow Statement

Concept	2013	2012 Q4	2012
OPERATING ACTIVITIES
Net Income	$82.09M	$1.520M	-$72.00K
YoY Change	-114106.94%	-150.67%	-98.89%
Depreciation, Depletion And Amortization	$2.794M	$1.260M	$3.074M
YoY Change	-9.11%	20.0%	-24.58%
Cash From Operating Activities	$35.26M	$14.62M	$43.30M
YoY Change	-18.57%	69.8%	47.78%
INVESTING ACTIVITIES
Capital Expenditures	$1.798M	-$680.0K	$1.049M
YoY Change	71.4%	119.35%	31.13%
Acquisitions
YoY Change
Other Investing Activities	$11.38M	-$94.11M	-$58.05M
YoY Change	-119.6%	29.4%	-160.01%
Cash From Investing Activities	$9.580M	-$94.78M	-$59.09M
YoY Change	-116.21%	29.76%	-161.59%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$278.0K		$63.00K
YoY Change	341.27%		28.57%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-125.7M	136.4M	93.35M
YoY Change	-234.63%	1933.08%	-153.94%
NET CHANGE
Cash From Operating Activities	35.26M	14.62M	43.30M
Cash From Investing Activities	9.580M	-94.78M	-59.09M
Cash From Financing Activities	-125.7M	136.4M	93.35M
Net Change In Cash	-80.84M	56.26M	77.56M
YoY Change	-204.23%	-197.47%	-262.23%
FREE CASH FLOW
Cash From Operating Activities	$35.26M	$14.62M	$43.30M
Capital Expenditures	$1.798M	-$680.0K	$1.049M
Free Cash Flow	$33.46M	$15.30M	$42.25M
YoY Change	-20.8%	71.52%	48.25%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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
CY2013	osbc	Increase Decrease In Federal Home Loan Bank Stock IncreaseDecreaseInFederalHomeLoanBankStock	-910000	USD
CY2013Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	5500000	USD
CY2013Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	4800000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	6400000	USD
CY2013Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	376286000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	582141000	USD
CY2013Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	256571000	USD
CY2013	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-size:10.0pt;font-family:Times New Roman;"> <p style="TEXT-ALIGN: justify; MARGIN: 0in 0in 0pt;"><b><font style="FONT-FAMILY: Times New Roman; FONT-SIZE: 11pt; FONT-WEIGHT: bold;" size="2">Use of Estimates</font></b> <font style="FONT-SIZE: 11pt;" size="2">– The preparation of consolidated financial statements in conformity with generally accepted accounting principles (“GAAP”) and following general practices within the banking industry requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes.  Although these estimates and assumptions are based on the best available information, actual results could differ from those estimates.</font></p> </div>
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	579886000	USD
CY2013	osbc	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostWeightedAverageYield	0.0338	pure
CY2013	osbc	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostWeightedAverageYield	0.0323	pure
CY2013	osbc	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostWeightedAverageYield	0.0438	pure
CY2013	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Weighted Average Yield AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateWeightedAverageYield	0.0348	pure
CY2013Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	785000	USD
CY2013Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	5023000	USD
CY2013	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-size:10.0pt;font-family:Times New Roman;"> <p style="TEXT-ALIGN: justify; MARGIN: 0in 0in 0pt;"><b><font style="FONT-FAMILY: Times New Roman; FONT-SIZE: 11pt; FONT-WEIGHT: bold;" size="2">Concentration of Credit Risk</font></b> <font style="FONT-SIZE: 11pt;" size="2">– Most of the Company’s business activity is with customers located within Kane, Kendall, DeKalb, DuPage, LaSalle, Will and southwestern Cook counties in Illinois.  These banking centers surround the Chicago metropolitan area.  Therefore, the Company’s exposure to credit risk is significantly affected by changes in the economy in that market area since the Bank generally makes loans within its market.  There are no significant concentrations of loans where the customers’ ability to honor loan terms is dependent upon a single economic sector.</font></p> </div>
CY2013Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	266700000	USD
CY2012Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	210100000	USD
CY2013	us-gaap	Held To Maturity Securities Unrecognized Holding Gains HeldToMaturitySecuritiesUnrecognizedHoldingGains	688000	USD
CY2013Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	773000	USD
CY2013Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	4725000	USD
CY2013Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	23161000	USD
CY2013Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	6743000	USD
CY2013Q4	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Amortized Cost Basis AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis	35402000	USD
CY2013	osbc	Available For Sale Securities Debt Maturities Within One Year Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCostWeightedAverageYield	0.0358	pure
CY2013	us-gaap	Advertising Cost Policy Expensed Advertising Cost AdvertisingCostPolicyExpensedAdvertisingCost	<div style="font-size:10.0pt;font-family:Times New Roman;"> <p style="TEXT-ALIGN: justify; MARGIN: 0in 0in 0pt;"><b><font style="FONT-FAMILY: Times New Roman; FONT-SIZE: 11pt; FONT-WEIGHT: bold;" size="2">Advertising Costs</font></b><font style="FONT-SIZE: 11pt;" size="2"> – All advertising costs incurred by the Company are expensed in the period in which they are incurred.</font></p> </div>
CY2013Q4	osbc	Mortgage Loans Servicing Asset At Fair Value Amount MortgageLoansServicingAssetAtFairValueAmount	591500000	USD
CY2012Q4	osbc	Mortgage Loans Servicing Asset At Fair Value Amount MortgageLoansServicingAssetAtFairValueAmount	552000000	USD
CY2013	osbc	Period From Due Date After Which Accrual Of Interest Income Is Discontinued PeriodFromDueDateAfterWhichAccrualOfInterestIncomeIsDiscontinued	P90D
CY2013	osbc	Rolling Period Quarterly Adjustment For Actual Loss History RollingPeriodQuarterlyAdjustmentForActualLossHistory	P5Y
CY2012Q4	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	32	security
CY2013Q4	osbc	Available For Sale Securities Gross Unrealized Gain Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	3070000	USD
CY2012Q4	osbc	Available For Sale Securities Gross Unrealized Gain Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	7899000	USD
CY2013Q4	osbc	Available For Sale Securities Gross Unrealized Loss Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments	7165000	USD
CY2013Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	254328000	USD
CY2012Q4	osbc	Available For Sale Securities Gross Unrealized Loss Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments	10154000	USD
CY2013Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	372191000	USD
CY2013Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	22649000	USD
CY2013Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	6655000	USD
CY2013Q4	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Fair Value AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue	35112000	USD
CY2013	osbc	Available For Sale Securities Weighted Average Yield AvailableForSaleSecuritiesWeightedAverageYield	0.0201	pure
CY2011Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	4318000	USD
CY2013Q4	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	27	security
CY2013Q4	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	5	security
CY2013Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	32	security
CY2013Q4	osbc	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments	6633000	USD
CY2013Q4	osbc	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses Accumulated In Investments AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments	532000	USD
CY2013Q4	osbc	Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In Investments AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments	7165000	USD
CY2013Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	170149000	USD
CY2013Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	10836000	USD
CY2013Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	180985000	USD
CY2013	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	533302000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	223860000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	5376000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1937000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	7288000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	362000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	-1912000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	1575000	USD
CY2013	osbc	Available For Sale Securities Gross Realized Gain Loss Net Tax AvailableForSaleSecuritiesGrossRealizedGainLossNetTax	-784000	USD
CY2012	osbc	Available For Sale Securities Gross Realized Gain Loss Net Tax AvailableForSaleSecuritiesGrossRealizedGainLossNetTax	641000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1100771000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1149944000	USD
CY2013Q4	osbc	Loans And Leases Receivable Deferred Income Expense Net LoansAndLeasesReceivableDeferredIncomeExpenseNet	-485000	USD
CY2012Q4	osbc	Loans And Leases Receivable Deferred Income Expense Net LoansAndLeasesReceivableDeferredIncomeExpenseNet	-106000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1101256000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1150050000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	6529000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	6701000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	6357000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	1081000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	89000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	87000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	12975000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	7869000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1059556000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1054476000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	77519000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	38911000	USD
CY2013Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	35075000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	89000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	87000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	60679000	USD
CY2011Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	93290000	USD
CY2012Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	72423000	USD
CY2013Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	11495000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	28306000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	88985000	USD
CY2013Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	46570000	USD
CY2013Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	42799000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	77940000	USD
CY2013Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	13996000	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
CY2013Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	56795000	USD
CY2013Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2395000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	6259000	USD
CY2013	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	47877000	USD
CY2012	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	68403000	USD
CY2013	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	19901000	USD
CY2012	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	45402000	USD
CY2013	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	67778000	USD
CY2012	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	113805000	USD
CY2012	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	642000	USD
CY2013	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	390000	USD
CY2012	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	40000	USD
CY2013	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	390000	USD
CY2012	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	682000	USD
CY2013	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3	contract
CY2012	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	13	contract
CY2013	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	801000	USD
CY2012	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	6613000	USD
CY2013	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	623000	USD
CY2012	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	5182000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	6414000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	3586000	USD
CY2013	osbc	Number Of Days Past Due Maximum NumberOfDaysPastDueMaximum	P90D
CY2013	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	27616000	USD
CY2012	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	13486000	USD
CY2013	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	24831000	USD
CY2012	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	14118000	USD
CY2013	osbc	Loans And Leases Receivable Related Parties Increase Decrease Due To Change In Related Party Status LoansAndLeasesReceivableRelatedPartiesIncreaseDecreaseDueToChangeInRelatedPartyStatus	-43000	USD
CY2012	osbc	Loans And Leases Receivable Related Parties Increase Decrease Due To Change In Related Party Status LoansAndLeasesReceivableRelatedPartiesIncreaseDecreaseDueToChangeInRelatedPartyStatus	100000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	51997000	USD
CY2013Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	2395000	USD
CY2013	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	11205000	USD
CY2013	osbc	Number Of Management Factors Of Methodology Calculations Subject To Minor Change NumberOfManagementFactorsOfMethodologyCalculationsSubjectToMinorChange	2	item
CY2012	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	27865000	USD
CY2013	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	8439000	USD
CY2012	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	8181000	USD
CY2013	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-8550000	USD
CY2012	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6284000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	38597000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	27281000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	6259000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	75303000	USD
CY2013Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	24886000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	32338000	USD
CY2013	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	19194000	USD
CY2013Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	41537000	USD
CY2012	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	32121000	USD
CY2013Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	46570000	USD
CY2013Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1054686000	USD
CY2013Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	5807000	USD
CY2013	us-gaap	Real Estate Improvements RealEstateImprovements	73000	USD
CY2012	us-gaap	Real Estate Improvements RealEstateImprovements	701000	USD
CY2012Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	88985000	USD
CY2012Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1061065000	USD
CY2013	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	41712000	USD
CY2012	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	36854000	USD
CY2013	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	8441000	USD
CY2012	us-gaap	Real Estate Owned Valuation Allowance Provision RealEstateOwnedValuationAllowanceProvision	16835000	USD
CY2011Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	23462000	USD
CY2012Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	31454000	USD
CY2013Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	22284000	USD
CY2013	osbc	Real Estate Owned Valuation Allowance Provision Net Of Adjustment RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment	8293000	USD
CY2012	osbc	Real Estate Owned Valuation Allowance Provision Net Of Adjustment RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment	16385000	USD
CY2013	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	17389000	USD
CY2012	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	8843000	USD
CY2013	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	-74000	USD
CY2013Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1065	pure
CY2013Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0400	pure
CY2013Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	46005000	USD
CY2013Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	288345000	USD
CY2013Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	184094000	USD
CY2013Q4	us-gaap	Deposits Deposits	1682128000	USD
CY2012	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	450000	USD
CY2013	osbc	Death Benefit Realized On Bank Owned Life Insurance DeathBenefitRealizedOnBankOwnedLifeInsurance	381000	USD
CY2013	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	1956000	USD
CY2012Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	221753000	USD
CY2013	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	5705000	USD
CY2012	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	7973000	USD
CY2012	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2198000	USD
CY2012	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-2848000	USD
CY2013	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	10747000	USD
CY2013	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5697000	USD
CY2012	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	18663000	USD
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	57365000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	103370000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	101988000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	54986000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	47002000	USD
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
CY2013Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	22560000	USD
CY2013Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	373389000	USD
CY2013Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	228589000	USD
CY2013Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	297852000	USD
CY2013Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	309859000	USD
CY2012Q4	us-gaap	Deposit Liabilities With Abnormal Terms DepositLiabilitiesWithAbnormalTerms	2100000	USD
CY2013Q4	us-gaap	Deposit Liabilities With Abnormal Terms DepositLiabilitiesWithAbnormalTerms	3400000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	313231000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	87359000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	24082000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	15066000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	32701000	USD
CY2013Q4	us-gaap	Time Deposits TimeDeposits	472439000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess	20701000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths	15594000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months	52609000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More After12 Months ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months	103044000	USD
CY2013Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess	24415000	USD
CY2013Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths	21137000	USD
CY2013Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months	77718000	USD
CY2013Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More After12 Months ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months	60824000	USD
CY2013Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	131438000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	27560000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	58378000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	117875000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	103878000	USD
CY2013	osbc	Debt Maturities Repayments Of Principal Weighted Average Interest Rate In Next Twelve Months DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInNextTwelveMonths	0.0002	pure
CY2012	osbc	Debt Maturities Repayments Of Principal Weighted Average Interest Rate In Next Twelve Months DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInNextTwelveMonths	0.0012	pure
CY2013	osbc	Long Term Debt Maturities Repayments Of Principal Weighted Average Interest Rate After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateAfterYearFive	0.0735	pure
CY2012	osbc	Long Term Debt Maturities Repayments Of Principal Weighted Average Interest Rate After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateAfterYearFive	0.0495	pure
CY2013	osbc	Debt Maturities Repayments Of Principal Weighted Average Interest Rate DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRate	0.0388	pure
CY2012	osbc	Debt Maturities Repayments Of Principal Weighted Average Interest Rate DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRate	0.0238	pure
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2780000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	989000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-302000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-436000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	738000	USD
CY2013	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-74145000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	18236000	USD
CY2012Q4	osbc	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation	679000	USD
CY2012Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets	965000	USD
CY2012Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Goodwill DeferredTaxAssetsGoodwillAndIntangibleAssetsGoodwill	16796000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	785000	USD
CY2012Q4	osbc	Deferred Tax Assets Other Real Estate Owned Write Downs DeferredTaxAssetsOtherRealEstateOwnedWriteDowns	16632000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	20736000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	10186000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1444000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	585000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	87044000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	12725000	USD
CY2013Q4	osbc	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation	788000	USD
CY2013Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets	1656000	USD
CY2013Q4	osbc	Deferred Tax Assets Goodwill And Intangible Assets Goodwill DeferredTaxAssetsGoodwillAndIntangibleAssetsGoodwill	15252000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	583000	USD
CY2013Q4	osbc	Deferred Tax Assets Other Real Estate Owned Write Downs DeferredTaxAssetsOtherRealEstateOwnedWriteDowns	10041000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	28023000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	11847000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1444000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1166000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	83525000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1063000	USD
CY2012Q4	osbc	Deferred Tax Liabilities Accretion On Securities DeferredTaxLiabilitiesAccretionOnSecurities	122000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	1819000	USD
CY2012Q4	osbc	Deferred Tax Liabilities State Tax Benefits DeferredTaxLiabilitiesStateTaxBenefits	7315000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	217000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10536000	USD
CY2012Q4	osbc	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	76508000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	928000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	76508000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	928000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1035000	USD
CY2013Q4	osbc	Deferred Tax Liabilities Accretion On Securities DeferredTaxLiabilitiesAccretionOnSecurities	8000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	2571000	USD
CY2013Q4	osbc	Deferred Tax Liabilities State Tax Benefits DeferredTaxLiabilitiesStateTaxBenefits	6994000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	178000	USD
CY2013Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10786000	USD
CY2013Q4	osbc	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	72739000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	4927000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2363000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	75303000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Provision For Loan Losses DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses	6125000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Deferred Compensation DeferredIncomeTaxExpenseBenefitDeferredCompensation	-51000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Intangible Assets DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets	-382000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost	326000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Other Real Estate Owned Write Downs DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns	-6538000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Domestic DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic	-926000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards State And Local DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal	-446000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Depreciation DeferredIncomeTaxExpenseBenefitDepreciation	-202000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Premiums And Discounts On Securities Net DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet	85000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Mortgage Servicing Rights DeferredIncomeTaxExpenseBenefitMortgageServicingRights	281000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Goodwill DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill	1526000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit State Tax Benefits DeferredIncomeTaxExpenseBenefitStateTaxBenefits	114000	USD
CY2012	osbc	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	-650000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Provision For Loan Losses DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses	5511000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Deferred Compensation DeferredIncomeTaxExpenseBenefitDeferredCompensation	-109000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-5059000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Intangible Assets DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets	-691000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost	202000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Other Real Estate Owned Write Downs DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns	6591000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Domestic DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic	-7287000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Operating Loss Carryforwards State And Local DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal	-1661000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Depreciation DeferredIncomeTaxExpenseBenefitDepreciation	-28000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Premiums And Discounts On Securities Net DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet	-114000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Mortgage Servicing Rights DeferredIncomeTaxExpenseBenefitMortgageServicingRights	752000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Goodwill And Intangible Assets Goodwill DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill	1544000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit State Tax Benefits DeferredIncomeTaxExpenseBenefitStateTaxBenefits	-321000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	-620000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-25000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	192000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-563000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-53000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	299000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-204000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4145000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	245000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-694000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	662000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	10000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	25000	USD
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1908332	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	45368	shares
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	291000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	167000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0485	pure
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14074188	shares
CY2012	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13876129	shares
CY2012	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	331123	shares
CY2012	us-gaap	Net Income Loss NetIncomeLoss	-72000	USD
CY2012	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	4987000	USD
CY2012	us-gaap	Undistributed Earnings UndistributedEarnings	-5059000	USD
CY2012	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	-0.36
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.36
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	13939919	shares
CY2013	osbc	Weighted Average Number Of Shares Outstanding Excluding Share Based Payment Awards WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13896893	shares
CY2013	osbc	Weighted Average Number Of Share Based Payment Awards WeightedAverageNumberOfShareBasedPaymentAwards	209140	shares
CY2013	us-gaap	Net Income Loss NetIncomeLoss	82085000	USD
CY2013	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	5258000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	76827000	USD
CY2013	us-gaap	Undistributed Earnings UndistributedEarnings	76827000	USD
CY2013	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	5.45
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.45
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14207252	shares
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-5059000	USD
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.36
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14106033	shares
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	76827000	USD
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.45
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	129000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	112000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	67000	USD
CY2013Q4	osbc	Operating Leases Future Minimum Payments Due In Year Four And Thereafter OperatingLeasesFutureMinimumPaymentsDueInYearFourAndThereafter	9000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	291000	USD
CY2012	osbc	Operating Leases Lease Revenue Expense Net OperatingLeasesLeaseRevenueExpenseNet	50000	USD
CY2013	osbc	Operating Leases Lease Revenue Expense Net OperatingLeasesLeaseRevenueExpenseNet	64000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	941000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	830000	USD
CY2013	osbc	Amount Of Loans Held For Sale Sold AmountOfLoansHeldForSaleSold	185400000	USD
CY2012Q4	us-gaap	Capital Capital	189465000	USD
CY2012Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	111286000	USD
CY2013Q4	us-gaap	Capital Capital	200139000	USD
CY2013Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	100826000	USD
CY2012Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1362	pure
CY2012Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2013Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2013Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1588	pure
CY2012Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	94816000	USD
CY2013Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	134199000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	55692000	USD
CY2013Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	50403000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0681	pure
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0400	pure
CY2012Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	94816000	USD
CY2013Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	134199000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	78199000	USD
CY2013Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	77126000	USD
CY2013Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0696	pure
CY2009Q1	us-gaap	Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants	73000000	USD
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	1.00	pure
	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.02	pure
CY2013	us-gaap	Defined Contribution Plan Employers Matching Contribution Annual Vesting Percentage DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage	1.00	pure
CY2013	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	468000	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	441000	USD
CY2013Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1800000	USD
CY2012Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1500000	USD
CY2013	dei	Entity Registrant Name EntityRegistrantName	OLD SECOND BANCORP INC
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-95000000	USD
CY2013	osbc	Dividend Restrictions Number Of Previous Years Retained Profit DividendRestrictionsNumberOfPreviousYearsRetainedProfit	P2Y
CY2013	osbc	Addition To Securities Portfolio Net AdditionToSecuritiesPortfolioNet	48900000	USD
CY2012Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	0	USD
CY2013	osbc	Fair Value Measurement Significant Transfers Between Levels FairValueMeasurementSignificantTransfersBetweenLevels	0	USD
CY2012	osbc	Fair Value Measurement Significant Transfers Between Levels FairValueMeasurementSignificantTransfersBetweenLevels	0	USD
CY2013	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	1295000	USD
CY2012	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	3497000	USD
CY2013	dei	Entity Central Index Key EntityCentralIndexKey	0000357173
CY2013	dei	Document Type DocumentType	10-K
CY2013	dei	Document Period End Date DocumentPeriodEndDate	2013-12-31
CY2013	dei	Amendment Flag AmendmentFlag	false
CY2013	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013	dei	Entity Filer Category EntityFilerCategory	Smaller Reporting Company
CY2013Q2	dei	Entity Public Float EntityPublicFloat	70100000	USD
CY2014Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	13923843	shares
CY2013	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	44221000	USD
CY2013Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	14450000	USD
CY2012Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	84286000	USD
CY2013Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	47660000	USD
CY2012Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	128507000	USD
CY2013Q4	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
CY2013Q4	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	3822000	USD
CY2012Q4	us-gaap	Loans Held For Sale Other LoansHeldForSaleOther	9571000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1073975000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1111453000	USD
CY2012Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	4116000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1177000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3276000	USD
CY2013Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	55410000	USD
CY2012Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	54203000	USD
CY2013Q4	us-gaap	Other Assets OtherAssets	14284000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	23232000	USD
CY2013Q4	us-gaap	Assets Assets	2004034000	USD
CY2012Q4	us-gaap	Assets Assets	2045799000	USD
CY2013Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	836300000	USD
CY2012Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	826976000	USD
CY2012Q4	us-gaap	Time Deposits TimeDeposits	510792000	USD
CY2012Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	17875000	USD
CY2013Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	5000000	USD
CY2012Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	100000000	USD
CY2013Q4	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
CY2013Q4	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2012Q4	us-gaap	Subordinated Debt SubordinatedDebt	45000000	USD
CY2013Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2012Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	500000	USD
CY2013Q4	us-gaap	Other Liabilities OtherLiabilities	42776000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	34275000	USD
CY2013Q4	us-gaap	Liabilities Liabilities	1856342000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	1973247000	USD
CY2013Q4	us-gaap	Preferred Stock Value PreferredStockValue	72942000	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	71869000	USD
CY2013Q4	us-gaap	Common Stock Value CommonStockValue	18830000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	18729000	USD
CY2013Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	66212000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	66189000	USD
CY2013Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	92549000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	12048000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7038000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1327000	USD
CY2013Q4	us-gaap	Treasury Stock Value TreasuryStockValue	95803000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	94956000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	147692000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	72552000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2004034000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2045799000	USD
CY2013Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	256571000	USD
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	73000	shares
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	18729134	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	14084328	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	4644806	shares
CY2013Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2013Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2013Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000	shares
CY2013Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	73000	shares
CY2013Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	73000	shares
CY2013Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2013Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2013Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	18829734	shares
CY2013Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	13917108	shares
CY2013Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	4912626	shares
CY2013	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	56193000	USD
CY2012	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	66769000	USD
CY2013	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	156000	USD
CY2012	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	260000	USD
CY2013	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	11692000	USD
CY2012	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	7212000	USD
CY2013	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	587000	USD
CY2012	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	416000	USD
CY2013	us-gaap	Dividend Income Operating DividendIncomeOperating	304000	USD
CY2012	us-gaap	Dividend Income Operating DividendIncomeOperating	305000	USD
CY2013	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	108000	USD
CY2012	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	119000	USD
CY2013	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	69040000	USD
CY2012	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	75081000	USD
CY2013	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	859000	USD
CY2012	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	1062000	USD
CY2013	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	6774000	USD
CY2012	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	8809000	USD
CY2013	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	3000	USD
CY2012	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	2000	USD
CY2013	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	25000	USD
CY2012	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	17000	USD
CY2013	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	5298000	USD
CY2012	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	4925000	USD
CY2013	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	811000	USD
CY2012	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	903000	USD
CY2013	us-gaap	Interest Expense Debt InterestExpenseDebt	16000	USD
CY2012	us-gaap	Interest Expense Debt InterestExpenseDebt	17000	USD
CY2013	us-gaap	Interest Expense InterestExpense	13786000	USD
CY2012	us-gaap	Interest Expense InterestExpense	15735000	USD
CY2013	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	55254000	USD
CY2012	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	59346000	USD
CY2013	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	63804000	USD
CY2012	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	53062000	USD
CY2013	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	6339000	USD
CY2012	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	6041000	USD
CY2013	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	7256000	USD
CY2012	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	7682000	USD
CY2013	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	821000	USD
CY2012	us-gaap	Fees And Commissions Mortgage Banking FeesAndCommissionsMortgageBanking	1307000	USD
CY2013	us-gaap	Servicing Fees Net ServicingFeesNet	1913000	USD
CY2012	us-gaap	Servicing Fees Net ServicingFeesNet	-289000	USD
CY2013	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	5627000	USD
CY2012	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	10688000	USD
CY2013	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-1912000	USD
CY2012	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	1575000	USD
CY2013	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1603000	USD
CY2012	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1608000	USD
CY2013	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	3458000	USD
CY2012	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	3547000	USD
CY2012	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5060000	USD
CY2013	us-gaap	Noninterest Income NoninterestIncome	31183000	USD
CY2012	us-gaap	Noninterest Income NoninterestIncome	37219000	USD
CY2013	us-gaap	Labor And Related Expense LaborAndRelatedExpense	36688000	USD
CY2012	us-gaap	Labor And Related Expense LaborAndRelatedExpense	34989000	USD
CY2013	us-gaap	Occupancy Net OccupancyNet	5032000	USD
CY2012	us-gaap	Occupancy Net OccupancyNet	4841000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	5614000	USD
CY2013	us-gaap	Equipment Expense EquipmentExpense	4264000	USD
CY2012	us-gaap	Equipment Expense EquipmentExpense	4614000	USD
CY2013	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4027000	USD
CY2012	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4031000	USD
CY2013	us-gaap	General Insurance Expense GeneralInsuranceExpense	2318000	USD
CY2012	us-gaap	General Insurance Expense GeneralInsuranceExpense	3384000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2099000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1402000	USD
CY2013	us-gaap	Advertising Expense AdvertisingExpense	1225000	USD
CY2012	us-gaap	Advertising Expense AdvertisingExpense	1309000	USD
CY2013	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1433000	USD
CY2012	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1548000	USD
CY2013	us-gaap	Legal Fees LegalFees	2066000	USD
CY2012	us-gaap	Legal Fees LegalFees	3176000	USD
CY2013	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	10747000	USD
CY2012	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	18663000	USD
CY2013	us-gaap	Other Noninterest Expense OtherNoninterestExpense	13245000	USD
CY2012	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12396000	USD
CY2013	us-gaap	Noninterest Expense NoninterestExpense	83144000	USD
CY2012	us-gaap	Noninterest Expense NoninterestExpense	90353000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	11843000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-72000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-70242000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-11965000	USD
CY2013	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	-4924000	USD
CY2012	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Unrealized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	2305000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-7041000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	3309000	USD
CY2013	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	1912000	USD
CY2012	osbc	Other Comprehensive Income Realized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1575000	USD
CY2013	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	784000	USD
CY2012	osbc	Other Comprehensive Income Available For Sale Securities Tax Portion On Net Realized Gains Attributable To Parent OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	-641000	USD
CY2013	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	1128000	USD
CY2012	osbc	Other Comprehensive Income Loss Net Of Tax Portion Of Realized Gains Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	-934000	USD
CY2013	osbc	Other Comprehensive Income Available For Sale Securities Unrealized Holding Gain Loss Net Reclassification Adjustment For Amounts Realized After Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	-5913000	USD
CY2012	osbc	Other Comprehensive Income Available For Sale Securities Unrealized Holding Gain Loss Net Reclassification Adjustment For Amounts Realized After Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	2375000	USD
CY2013	us-gaap	Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred To Available For Sale Securities Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax	343000	USD
CY2013	osbc	Other Comprehensive Income Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities Tax OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax	141000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Transfers From Held To Maturity To Available For Sale Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax	202000	USD
CY2013	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-5711000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	2375000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	76374000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2303000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2794000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3074000	USD
CY2013	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-260000	USD
CY2012	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	1575000	USD
CY2013	osbc	Gain On Recapture Of Restricted Stock GainOnRecaptureOfRestrictedStock	612000	USD
CY2013	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	70376000	USD
CY2013	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	181497000	USD
CY2012	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	291559000	USD
CY2013	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	191019000	USD
CY2012	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	303561000	USD
CY2013	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-132000	USD
CY2012	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	815000	USD
CY2013	osbc	Death Claim On Bank Owned Life Insurance DeathClaimOnBankOwnedLifeInsurance	396000	USD
CY2013	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	-8764000	USD
CY2012	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	-8381000	USD
CY2013	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	8877000	USD
CY2012	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	8119000	USD
CY2013	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	528000	USD
CY2012	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-943000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	167000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	291000	USD
CY2013	osbc	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	8293000	USD
CY2012	osbc	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	16385000	USD
CY2013	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	9000	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	609000	USD
CY2012	osbc	Gain Loss On Transfer Of Property To Other Real Estate GainLossOnTransferOfPropertyToOtherRealEstate	782000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	35256000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	43303000	USD
CY2013	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	40028000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	79642000	USD
CY2013	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	609033000	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	571153000	USD
CY2013	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	2444000	USD
CY2013	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-21505000	USD
CY2012	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-167490000	USD
CY2013	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	73000	USD
CY2012	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	701000	USD
CY2013	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	43668000	USD
CY2012	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	39052000	USD
CY2013	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	10000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	917000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1798000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1049000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	9581000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-59094000	USD
CY2013	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-35091000	USD
CY2012	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-23562000	USD
CY2013	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	4685000	USD
CY2012	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	16974000	USD
CY2013	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	278000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	63000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-125684000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	93349000	USD
CY2013	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-80847000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	77558000	USD
CY2011Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	50949000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	266000	USD
CY2013	osbc	Interest Paid For Deposits InterestPaidForDeposits	7868000	USD
CY2013	us-gaap	Interest Paid InterestPaid	864000	USD
CY2013	osbc	Non Cash Transfer Of Loans To Other Real Estate Owned NonCashTransferOfLoansToOtherRealEstateOwned	19194000	USD
CY2013	us-gaap	Transfer Of Investments TransferOfInvestments	5329000	USD
CY2013	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	237154000	USD
CY2013	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	1073000	USD
CY2013	osbc	Fair Value Difference On Recapture Of Restricted Stock FairValueDifferenceOnRecaptureOfRestrictedStock	43000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-815000	USD
CY2012	osbc	Interest Paid For Deposits InterestPaidForDeposits	10592000	USD
CY2012	us-gaap	Interest Paid InterestPaid	930000	USD
CY2012	osbc	Non Cash Transfer Of Loans To Other Real Estate Owned NonCashTransferOfLoansToOtherRealEstateOwned	31761000	USD
CY2012	osbc	Non Cash Transfer Of Premises To Other Real Estate Owned NonCashTransferOfPremisesToOtherRealEstateOwned	360000	USD
CY2012	osbc	Accretion On Preferred Stock Warrants AccretionOnPreferredStockWarrants	1006000	USD
CY2013Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	511000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	3981000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	74002000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2375000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	63000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	291000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	1664000	USD
CY2012	osbc	Preferred Stock Dividends And Other Adjustments Equity Impact PreferredStockDividendsAndOtherAdjustmentsEquityImpact	3981000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-5711000	USD
CY2013	osbc	Recapture Of Restricted Stock RecaptureOfRestrictedStock	612000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	167000	USD
CY2013	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	278000	USD
CY2013	osbc	Preferred Stock Dividends And Other Adjustments Equity Impact PreferredStockDividendsAndOtherAdjustmentsEquityImpact	511000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	3998000	USD
CY2012	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
CY2012Q4	osbc	Loans Fully Charged Carrying Value LoansFullyChargedCarryingValue	0	USD
CY2013Q4	osbc	Loans Fully Charged Carrying Value LoansFullyChargedCarryingValue	0	USD
CY2013Q4	osbc	Deferred Tax Assets Valuation Allowance On Available For Sale Securities DeferredTaxAssetsValuationAllowanceOnAvailableForSaleSecurities	0	USD
CY2013Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	0	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	100000000	USD
CY2013Q4	osbc	Held To Maturity Securities Purchases During Period Number HeldToMaturitySecuritiesPurchasesDuringPeriodNumber	0	item
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	928000	USD
CY2013Q4	osbc	Held To Maturity Securities In Unrealized Loss Positions Less Than12 Months Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsLessThan12MonthsQualitativeDisclosureNumberOfPositions	25	security
CY2013Q4	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	25	security
CY2013	us-gaap	Heldtomaturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Loss HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss	2931000	USD
CY2013	us-gaap	Heldtomaturity Securities Continuous Unrealized Loss Position Aggregate Loss HeldtomaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss	2931000	USD
CY2013Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	175766000	USD
CY2013Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	175766000	USD
CY2012Q4	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	3	security
CY2012Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	35	security
CY2012Q4	osbc	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments	2140000	USD
CY2012Q4	osbc	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses Accumulated In Investments AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments	8014000	USD
CY2012Q4	osbc	Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In Investments AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments	10154000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	155213000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	12300000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	167513000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	134000	USD
CY2013	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-74100000	USD
CY2013	osbc	Deferred Income Tax Expense Benefit Offset By Reversal Of Deferred Tax Valuation Allowance Reserve DeferredIncomeTaxExpenseBenefitOffsetByReversalOfDeferredTaxValuationAllowanceReserve	3800000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	45500000	USD
CY2013	osbc	Long Term Debt Maturities Repayments Of Principal Weighted Average Interest Rate In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInYearFive	0.0176	pure
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	105000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	29000	USD
CY2013	us-gaap	Held To Maturity Securities Unrecognized Holding Losses HeldToMaturitySecuritiesUnrecognizedHoldingLosses	2931000	USD
CY2013	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	4	contract
CY2012	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	contract
CY2013	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	1077000	USD
CY2012	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	460000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-70376000	USD

Files In Submission

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$OSBC
Old Second Bancorp Inc Stock $osbc

2013 Form 10-K Financial Statement

#000110465914013651 Filed on February 26, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC Old Second Bancorp Inc Stock $osbc

2013 Form 10-K Financial Statement

#000110465914013651 Filed on February 26, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC
Old Second Bancorp Inc Stock $osbc