<?xml version="1.0" encoding="us-ascii"?>
<!-- Created by Merrill Corporation -->
<!-- Generated by Fujitsu XWand B0126 -->
<!-- Generated by Fujitsu Interstage XWand B0166_M01 -->
<!--Generated by IRIS XBRL Generation Engine-->
<xsd:schema targetNamespace="http://www.oldsecond.com/20120930" attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:osbc="http://www.oldsecond.com/20120930" xmlns:us-gaap="http://fasb.org/us-gaap/2012-01-31" xmlns:us-roles="http://fasb.org/us-roles/2012-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:invest="http://xbrl.sec.gov/invest/2012-01-31" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:us-types="http://fasb.org/us-types/2012-01-31" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:ref="http://www.xbrl.org/2004/ref" xmlns:attributeFormDefault="unqualified" xmlns:dei="http://xbrl.sec.gov/dei/2012-01-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:type="simple" xlink:href="osbc-20120930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="osbc-20120930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="osbc-20120930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="osbc-20120930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:roleType roleURI="http://www.oldsecond.com/role/DocumentAndEntityInformation" id="DocumentAndEntityInformation">
        <link:definition>0000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/BalanceSheet" id="BalanceSheet">
        <link:definition>0010 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/BalanceSheetParenthetical" id="BalanceSheetParenthetical">
        <link:definition>0015 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/StatementOfIncome" id="StatementOfIncome">
        <link:definition>0020 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/StatementOfComprehensiveIncome" id="StatementOfComprehensiveIncome">
        <link:definition>0030 - Statement - Consolidated Statements of Comprehensive Income (Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/CashFlows" id="CashFlows">
        <link:definition>0040 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/StatementOfChangesInStockholdersEquity" id="StatementOfChangesInStockholdersEquity">
        <link:definition>0050 - Statement - Consolidated Statements of Changes in Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/StatementOfChangesInStockholdersEquityParenthetical" id="StatementOfChangesInStockholdersEquityParenthetical">
        <link:definition>0055 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureSummaryOfSignificantAccountingPolicies" id="DisclosureSummaryOfSignificantAccountingPolicies">
        <link:definition>1010 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureSecurities" id="DisclosureSecurities">
        <link:definition>1020 - Disclosure - Securities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLoans" id="DisclosureLoans">
        <link:definition>1030 - Disclosure - Loans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureAllowanceForLoanLosses" id="DisclosureAllowanceForLoanLosses">
        <link:definition>1040 - Disclosure - Allowance for Loan Losses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureOtherRealEstateOwned" id="DisclosureOtherRealEstateOwned">
        <link:definition>1050 - Disclosure - Other Real Estate Owned</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureDeposits" id="DisclosureDeposits">
        <link:definition>1060 - Disclosure - Deposits</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureBorrowings" id="DisclosureBorrowings">
        <link:definition>1070 - Disclosure - Borrowings</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureJuniorSubordinatedDebentures" id="DisclosureJuniorSubordinatedDebentures">
        <link:definition>1080 - Disclosure - Junior Subordinated Debentures</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLongTermIncentivePlan" id="DisclosureLongTermIncentivePlan">
        <link:definition>1090 - Disclosure - Long-Term Incentive Plan</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLossPerShare" id="DisclosureLossPerShare">
        <link:definition>1100 - Disclosure - Loss Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureRegulatoryAndCapitalMatters" id="DisclosureRegulatoryAndCapitalMatters">
        <link:definition>1110 - Disclosure - Regulatory &amp; Capital Matters</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFairValueOptionAndFairValueMeasurements" id="DisclosureFairValueOptionAndFairValueMeasurements">
        <link:definition>1120 - Disclosure - Fair Value Option and Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndDerivativeTransactions" id="DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndDerivativeTransactions">
        <link:definition>1130 - Disclosure - Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFairValuesOfFinancialInstruments" id="DisclosureFairValuesOfFinancialInstruments">
        <link:definition>1140 - Disclosure - Fair Values of Financial Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosurePreferredStock" id="DisclosurePreferredStock">
        <link:definition>1150 - Disclosure - Preferred Stock</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureSecuritiesTables" id="DisclosureSecuritiesTables">
        <link:definition>3020 - Disclosure - Securities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLoansTables" id="DisclosureLoansTables">
        <link:definition>3030 - Disclosure - Loans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureAllowanceForLoanLossesTables" id="DisclosureAllowanceForLoanLossesTables">
        <link:definition>3040 - Disclosure - Allowance for Loan Losses (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureOtherRealEstateOwnedTables" id="DisclosureOtherRealEstateOwnedTables">
        <link:definition>3050 - Disclosure - Other Real Estate Owned (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureDepositsTables" id="DisclosureDepositsTables">
        <link:definition>3060 - Disclosure - Deposits (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureBorrowingsTables" id="DisclosureBorrowingsTables">
        <link:definition>3070 - Disclosure - Borrowings (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLongTermIncentivePlanTables" id="DisclosureLongTermIncentivePlanTables">
        <link:definition>3090 - Disclosure - Long-Term Incentive Plan (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLossPerShareTables" id="DisclosureLossPerShareTables">
        <link:definition>3100 - Disclosure - Loss Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureRegulatoryAndCapitalMattersTables" id="DisclosureRegulatoryAndCapitalMattersTables">
        <link:definition>3110 - Disclosure - Regulatory &amp; Capital Matters (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFairValueOptionAndFairValueMeasurementsTables" id="DisclosureFairValueOptionAndFairValueMeasurementsTables">
        <link:definition>3120 - Disclosure - Fair Value Option and Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndDerivativeTransactionsTables" id="DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndDerivativeTransactionsTables">
        <link:definition>3130 - Disclosure - Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFairValuesOfFinancialInstrumentsTables" id="DisclosureFairValuesOfFinancialInstrumentsTables">
        <link:definition>3140 - Disclosure - Fair Values of Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureSecuritiesDetails" id="DisclosureSecuritiesDetails">
        <link:definition>4020 - Disclosure - Securities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureSecuritiesDetails2" id="DisclosureSecuritiesDetails2">
        <link:definition>4021 - Disclosure - Securities (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureSecuritiesDetails3" id="DisclosureSecuritiesDetails3">
        <link:definition>4022 - Disclosure - Securities (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLoansDetails" id="DisclosureLoansDetails">
        <link:definition>4030 - Disclosure - Loans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLoansDetails2" id="DisclosureLoansDetails2">
        <link:definition>4031 - Disclosure - Loans (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLoansDetails3" id="DisclosureLoansDetails3">
        <link:definition>4032 - Disclosure - Loans (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLoansDetails4" id="DisclosureLoansDetails4">
        <link:definition>4033 - Disclosure - Loans (Details 4)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLoansDetails5" id="DisclosureLoansDetails5">
        <link:definition>4034 - Disclosure - Loans (Details 5)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureAllowanceForLoanLossesDetails" id="DisclosureAllowanceForLoanLossesDetails">
        <link:definition>4040 - Disclosure - Allowance for Loan Losses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureOtherRealEstateOwnedDetails" id="DisclosureOtherRealEstateOwnedDetails">
        <link:definition>4050 - Disclosure - Other Real Estate Owned (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureDepositsDetails" id="DisclosureDepositsDetails">
        <link:definition>4060 - Disclosure - Deposits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureBorrowingsDetails" id="DisclosureBorrowingsDetails">
        <link:definition>4070 - Disclosure - Borrowings (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureJuniorSubordinatedDebenturesDetails" id="DisclosureJuniorSubordinatedDebenturesDetails">
        <link:definition>4080 - Disclosure - Junior Subordinated Debentures (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureJuniorSubordinatedDebenturesDetails2" id="DisclosureJuniorSubordinatedDebenturesDetails2">
        <link:definition>4081 - Disclosure - Junior Subordinated Debentures (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLongTermIncentivePlanDetails" id="DisclosureLongTermIncentivePlanDetails">
        <link:definition>4090 - Disclosure - Long-Term Incentive Plan (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureLossPerShareDetails" id="DisclosureLossPerShareDetails">
        <link:definition>4100 - Disclosure - Loss Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureRegulatoryAndCapitalMattersDetails" id="DisclosureRegulatoryAndCapitalMattersDetails">
        <link:definition>4110 - Disclosure - Regulatory &amp; Capital Matters (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFairValueOptionAndFairValueMeasurementsDetails" id="DisclosureFairValueOptionAndFairValueMeasurementsDetails">
        <link:definition>4120 - Disclosure - Fair Value Option and Fair Value Measurements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFairValueOptionAndFairValueMeasurementsDetails2" id="DisclosureFairValueOptionAndFairValueMeasurementsDetails2">
        <link:definition>4121 - Disclosure - Fair Value Option and Fair Value Measurements (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFairValueOptionAndFairValueMeasurementsDetails3" id="DisclosureFairValueOptionAndFairValueMeasurementsDetails3">
        <link:definition>4122 - Disclosure - Fair Value Option and Fair Value Measurements (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndDerivativeTransactionsDetails" id="DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndDerivativeTransactionsDetails">
        <link:definition>4130 - Disclosure - Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndDerivativeTransactionsDetails2" id="DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndDerivativeTransactionsDetails2">
        <link:definition>4131 - Disclosure - Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureFairValuesOfFinancialInstrumentsDetails" id="DisclosureFairValuesOfFinancialInstrumentsDetails">
        <link:definition>4140 - Disclosure - Fair Values of Financial Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosurePreferredStockDetails" id="DisclosurePreferredStockDetails">
        <link:definition>4150 - Disclosure - Preferred Stock (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureBusinessCombination" id="DisclosureBusinessCombination">
        <link:definition>8000 - Disclosure - Business Combination</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureMortgageServicingRightsAndLoansHeldForSale" id="DisclosureMortgageServicingRightsAndLoansHeldForSale">
        <link:definition>8010 - Disclosure - Mortgage Servicing Rights and Loans Held-for-Sale</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureSubsequentEvents" id="DisclosureSubsequentEvents">
        <link:definition>8020 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureRegulatoryMatters" id="DisclosureRegulatoryMatters">
        <link:definition>8030 - Disclosure - Regulatory Matters</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureSummaryOfQuarterlyFinancialInformationUnaudited" id="DisclosureSummaryOfQuarterlyFinancialInformationUnaudited">
        <link:definition>8040 - Disclosure - Summary of Quarterly Financial Information (unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureCashAndDueFromBanks" id="DisclosureCashAndDueFromBanks">
        <link:definition>8050 - Disclosure - Cash and Due from Banks</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosurePremisesAndEquipment" id="DisclosurePremisesAndEquipment">
        <link:definition>8060 - Disclosure - Premises and Equipment</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureIncomeTaxes" id="DisclosureIncomeTaxes">
        <link:definition>8070 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureCommitments" id="DisclosureCommitments">
        <link:definition>8080 - Disclosure - Commitments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureMortgageBankingDerivatives" id="DisclosureMortgageBankingDerivatives">
        <link:definition>8090 - Disclosure - Mortgage Banking Derivatives</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureParentCompanyCondensedFinancialInformation" id="DisclosureParentCompanyCondensedFinancialInformation">
        <link:definition>8100 - Disclosure - Parent Company Condensed Financial Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureStockholdersRightsPlan" id="DisclosureStockholdersRightsPlan">
        <link:definition>8110 - Disclosure - Stockholders' Rights Plan</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/StatementOfChangesInStockholdersEquityCalc2" id="StatementOfChangesInStockholdersEquityCalc2">
        <link:definition>8120 - Statement - Consolidated Statements of Changes in Stockholders' Equity Calc 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.oldsecond.com/role/DisclosureOtherComprehensiveIncomeLoss" id="DisclosureOtherComprehensiveIncomeLoss">
        <link:definition>8130 - Disclosure - Other Comprehensive Income (Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:import namespace="http://fasb.org/us-gaap/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2012-01-31" schemaLocation="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://fasb.org/us-types/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-types-2012-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-roles-2012-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/invest/2012-01-31" schemaLocation="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:element name="AccruedInterestAndOtherAssets" id="osbc_AccruedInterestAndOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AccruedInterestAndOtherLiabilities" id="osbc_AccruedInterestAndOtherLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CardInterchangeIncomeDebit" id="osbc_CardInterchangeIncomeDebit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DeathBenefitRealizedOnBankOwnedLifeInsurance" id="osbc_DeathBenefitRealizedOnBankOwnedLifeInsurance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DebitCardInterchangeExpense" id="osbc_DebitCardInterchangeExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherRealEstateOwnedExpense" id="osbc_OtherRealEstateOwnedExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareAndPerShareInformationAbstract" id="osbc_ShareAndPerShareInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets" id="osbc_IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities" id="osbc_IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeathClaimOnBankOwnedLifeInsurance" id="osbc_DeathClaimOnBankOwnedLifeInsurance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TaxBenefitFromPaymentsOfDividend" id="osbc_TaxBenefitFromPaymentsOfDividend" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestPaidForDeposits" id="osbc_InterestPaidForDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AccretionOnPreferredStockWarrants" id="osbc_AccretionOnPreferredStockWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TransferOtherShortTermBorrowings" id="osbc_TransferOtherShortTermBorrowings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TransferToDeferredTaxesOnGoodwill" id="osbc_TransferToDeferredTaxesOnGoodwill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AdoptionOfMarkToMarketOfMortgageServicingRights" id="osbc_AdoptionOfMarkToMarketOfMortgageServicingRights" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AdjustmentsToAdditionalPaidInCapitalTaxEffectFromDividendEquivalentPayments" id="osbc_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromDividendEquivalentPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LoansDisclosureAbstract" id="osbc_LoansDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LoansTextBlock" id="osbc_LoansTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllowanceForLoanLossesDisclosureAbstract" id="osbc_AllowanceForLoanLossesDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllowanceForLoanLossesTextBlock" id="osbc_AllowanceForLoanLossesTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValuesOfFinancialInstrumentsDisclosureAbstract" id="osbc_FairValuesOfFinancialInstrumentsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValuesOfFinancialInstrumentsDisclosureTextBlock" id="osbc_FairValuesOfFinancialInstrumentsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DocumentAndEntityInformationAbstract" id="osbc_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashAndDueFromBanksDisclosureTextBlock" id="osbc_CashAndDueFromBanksDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockholdersRightsPlanDisclosureAbstract" id="osbc_StockholdersRightsPlanDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageServicingRightsAndLoansHeldForSaleDisclosureAbstract" id="osbc_MortgageServicingRightsAndLoansHeldForSaleDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageServicingRightsAndLoansHeldForSaleDisclosureTextBlock" id="osbc_MortgageServicingRightsAndLoansHeldForSaleDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockholdersRightsPlanDisclosureTextBlock" id="osbc_StockholdersRightsPlanDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageBankingDerivativesDisclosureAbstract" id="osbc_MortgageBankingDerivativesDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageBankingDerivativesDisclosureTextBlock" id="osbc_MortgageBankingDerivativesDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AmortizationAndRecoveryOfMortgageServicingRightsNet" id="osbc_AmortizationAndRecoveryOfMortgageServicingRightsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="GainLossOnTransferOfPropertyToOtherRealEstate" id="osbc_GainLossOnTransferOfPropertyToOtherRealEstate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NonCashTransferOfPremisesToOtherRealEstateOwned" id="osbc_NonCashTransferOfPremisesToOtherRealEstateOwned" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherRealEstateValuationAllowanceRollForwardTableTextBlock" id="osbc_OtherRealEstateValuationAllowanceRollForwardTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherRealEstateExpensesRelatedToForeclosedAssetsTableTextBlock" id="osbc_OtherRealEstateExpensesRelatedToForeclosedAssetsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateOwnedValuationAllowanceOtherAdjustments" id="osbc_RealEstateOwnedValuationAllowanceOtherAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ForeclosedRealEstateExpenseNetOfLeaseRevenue" id="osbc_ForeclosedRealEstateExpenseNetOfLeaseRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherRealEstateOwnedExpensesRelatedToForeclosedAssetsAbstract" id="osbc_OtherRealEstateOwnedExpensesRelatedToForeclosedAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfDepositsTableTextBlock" id="osbc_ScheduleOfDepositsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TimeDepositsLessThan250000" id="osbc_TimeDepositsLessThan250000" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="TimeDeposits250000OrMore" id="osbc_TimeDeposits250000OrMore" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ScheduleOfCollateralizedDebtObligationsTableTextBlock" id="osbc_ScheduleOfCollateralizedDebtObligationsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageBackedSecuritiesIssuedByUSGovernmentAgenciesMember" id="osbc_MortgageBackedSecuritiesIssuedByUSGovernmentAgenciesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInFederalHomeLoanBankStock" id="osbc_IncreaseDecreaseInFederalHomeLoanBankStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis" id="osbc_AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesWeightedAverageYieldRollingMaturityAbstract" id="osbc_AvailableForSaleSecuritiesWeightedAverageYieldRollingMaturityAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsWeightedAverageYield" id="osbc_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsWeightedAverageYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveWeightedAverageYield" id="osbc_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveWeightedAverageYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenWeightedAverageYield" id="osbc_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenWeightedAverageYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenWeightedAverageYield" id="osbc_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenWeightedAverageYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateWeightedAverageYield" id="osbc_AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateWeightedAverageYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesAsPercentageOfStockholdersEquity" id="osbc_AvailableForSaleSecuritiesAsPercentageOfStockholdersEquity" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateWeightedAverageYield" id="osbc_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateWeightedAverageYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleEquitySecuritiesWeightedAverageYield" id="osbc_AvailableForSaleEquitySecuritiesWeightedAverageYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesWeightedAverageYield" id="osbc_AvailableForSaleSecuritiesWeightedAverageYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue" id="osbc_AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions" id="osbc_AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions" id="osbc_AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CollateralizedDebtObligationClassA1Member" id="osbc_CollateralizedDebtObligationClassA1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollateralizedDebtObligationClassA2AMember" id="osbc_CollateralizedDebtObligationClassA2AMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesNumberOfBanksInIssuance" id="osbc_AvailableForSaleSecuritiesNumberOfBanksInIssuance" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesIssuanceDeferralsAndDefaultsAmount" id="osbc_AvailableForSaleSecuritiesIssuanceDeferralsAndDefaultsAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesIssuanceDeferralsAndDefaultsCollateralPercentage" id="osbc_AvailableForSaleSecuritiesIssuanceDeferralsAndDefaultsCollateralPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesIssuanceExcessSubordinationCollateralPercentage" id="osbc_AvailableForSaleSecuritiesIssuanceExcessSubordinationCollateralPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesIssuanceExcessSubordinationAmount" id="osbc_AvailableForSaleSecuritiesIssuanceExcessSubordinationAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="CreditFacilityMember" id="osbc_CreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TermDebtMember" id="osbc_TermDebtMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentMaturityTerm" id="osbc_DebtInstrumentMaturityTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SecuritiesSoldUnderAgreementsToRepurchaseNumberOfReportingPeriod" id="osbc_SecuritiesSoldUnderAgreementsToRepurchaseNumberOfReportingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FederalHomeLoanBankAdvancesAsPercentageOfTotalAssets" id="osbc_FederalHomeLoanBankAdvancesAsPercentageOfTotalAssets" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DebtInstrumentIncreaseInInterestRateOnNonComplianceOfFinancialCovenant" id="osbc_DebtInstrumentIncreaseInInterestRateOnNonComplianceOfFinancialCovenant" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FederalHomeLoanBankAdvancesAsPercentageOfBookValueOfCertainMortgageLoans" id="osbc_FederalHomeLoanBankAdvancesAsPercentageOfBookValueOfCertainMortgageLoans" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfFinancialCovenantsOutOfCompliance" id="osbc_NumberOfFinancialCovenantsOutOfCompliance" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="TermOfWrittenStrategicPlan" id="osbc_TermOfWrittenStrategicPlan" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseInTierOneLeverageCapital" id="osbc_IncreaseInTierOneLeverageCapital" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfClassificationsForPromptCorrectiveActionRegulations" id="osbc_NumberOfClassificationsForPromptCorrectiveActionRegulations" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TierOneLeverageCapitalActualOverTierOneLeverageCapitalTarget" id="osbc_TierOneLeverageCapitalActualOverTierOneLeverageCapitalTarget" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="IncreaseInCapitalToRiskWeightedAssetsRatio" id="osbc_IncreaseInCapitalToRiskWeightedAssetsRatio" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RiskBasedCapitalRatioActualOverRiskBasedCapitalRatioTarget" id="osbc_RiskBasedCapitalRatioActualOverRiskBasedCapitalRatioTarget" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CapitalToRiskBasedRatiosAbstract" id="osbc_CapitalToRiskBasedRatiosAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromTrustPreferredSecuritiesQualifyingAsTierOneCapital" id="osbc_ProceedsFromTrustPreferredSecuritiesQualifyingAsTierOneCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ProceedsFromTrustPreferredSecuritiesQualifyingAsTierTwoCapital" id="osbc_ProceedsFromTrustPreferredSecuritiesQualifyingAsTierTwoCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="DividendRestrictionsAndDeferralsAbstract" id="osbc_DividendRestrictionsAndDeferralsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DividendRestrictionsNumberOfPreviousYearsRetainedProfit" id="osbc_DividendRestrictionsNumberOfPreviousYearsRetainedProfit" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfStatutoryBusinessTrustsHoldingJuniorSubordinatedDebentures" id="osbc_NumberOfStatutoryBusinessTrustsHoldingJuniorSubordinatedDebentures" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AnnualInterestExpenseJuniorSubordinatedDebenturesThatCanBeDeferred" id="osbc_AnnualInterestExpenseJuniorSubordinatedDebenturesThatCanBeDeferred" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="JuniorSubordinatedDebentureDeferredUnpaidInterest" id="osbc_JuniorSubordinatedDebentureDeferredUnpaidInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="PreferredStockDividendRatePercentageForFirstFiveYears" id="osbc_PreferredStockDividendRatePercentageForFirstFiveYears" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PreferredStockDividendInitialRatePeriod" id="osbc_PreferredStockDividendInitialRatePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightTerm" id="osbc_ClassOfWarrantOrRightTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PreferredStockDividendRatePercentageAfterFirstFiveYears" id="osbc_PreferredStockDividendRatePercentageAfterFirstFiveYears" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PreferredStockNumberOfQuartersDividendsInArrears" id="osbc_PreferredStockNumberOfQuartersDividendsInArrears" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfDirectorsToBeAppointedInBoardByTreasury" id="osbc_NumberOfDirectorsToBeAppointedInBoardByTreasury" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfContractualCommitmentsDueToLettersOfCreditTableTextBlock" id="osbc_ScheduleOfContractualCommitmentsDueToLettersOfCreditTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DerivativeCommitmentsMember" id="osbc_DerivativeCommitmentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RiskParticipationAgreementsMember" id="osbc_RiskParticipationAgreementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfFinancialInstitutionsInvestmentSecuritiesPledged" id="osbc_NumberOfFinancialInstitutionsInvestmentSecuritiesPledged" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommitmentsToExtendCreditToBorrowersMember" id="osbc_CommitmentsToExtendCreditToBorrowersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommitmentsToExtendCreditToOthersMember" id="osbc_CommitmentsToExtendCreditToOthersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LoansIncludingLoansHeldForSaleFairValueDisclosure" id="osbc_LoansIncludingLoansHeldForSaleFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ForwardLoanCommitmentsFairValueDisclosure" id="osbc_ForwardLoanCommitmentsFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="OldSecondCapitalTrustIMember" id="osbc_OldSecondCapitalTrustIMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustPreferredSecuritiesIssuanceCostAmortizationPeriod" id="osbc_TrustPreferredSecuritiesIssuanceCostAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustPreferredSecuritiesMaturityPeriod" id="osbc_TrustPreferredSecuritiesMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestPaymentDefermentPeriod" id="osbc_InterestPaymentDefermentPeriod" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustPreferredSecuritiesCashDistributionRatePercentage" id="osbc_TrustPreferredSecuritiesCashDistributionRatePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustPreferredSecuritiesCashDistributionFixedRatePercentage" id="osbc_TrustPreferredSecuritiesCashDistributionFixedRatePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustPreferredSecuritiesBasisSpreadOnVariableRate" id="osbc_TrustPreferredSecuritiesBasisSpreadOnVariableRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustPreferredSecuritiesDescriptionOfVariableRateBasis" id="osbc_TrustPreferredSecuritiesDescriptionOfVariableRateBasis" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OldSecondCapitalTrustIIMember" id="osbc_OldSecondCapitalTrustIIMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfFinancingReceivableModificationsSubsequentPaymentDefaultTableTextBlock" id="osbc_ScheduleOfFinancingReceivableModificationsSubsequentPaymentDefaultTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherFinancingReceivableMember" id="osbc_OtherFinancingReceivableMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LoansAndLeasesReceivableAsPercentageOfAggregatePortfolio" id="osbc_LoansAndLeasesReceivableAsPercentageOfAggregatePortfolio" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialRealEstateOwnerOccupiedGeneralPurposeLoanMember" id="osbc_CommercialRealEstateOwnerOccupiedGeneralPurposeLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialRealEstateOwnerOccupiedSpecialPurposeLoanMember" id="osbc_CommercialRealEstateOwnerOccupiedSpecialPurposeLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialRealEstateNonOwnerOccupiedGeneralPurposeLoanMember" id="osbc_CommercialRealEstateNonOwnerOccupiedGeneralPurposeLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialRealEstateNonOwnerOccupiedSpecialPurposeLoanMember" id="osbc_CommercialRealEstateNonOwnerOccupiedSpecialPurposeLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialRealEstateRetailPropertiesLoanMember" id="osbc_CommercialRealEstateRetailPropertiesLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialRealEstateFarmLoanMember" id="osbc_CommercialRealEstateFarmLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConstructionRealEstateHomebuilderLoanMember" id="osbc_ConstructionRealEstateHomebuilderLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConstructionRealEstateLandLoanMember" id="osbc_ConstructionRealEstateLandLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConstructionRealEstateCommercialSpeculativeLoanMember" id="osbc_ConstructionRealEstateCommercialSpeculativeLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConstructionRealEstateOtherReceivableMember" id="osbc_ConstructionRealEstateOtherReceivableMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ResidentialInvestorLoanMember" id="osbc_ResidentialInvestorLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ResidentialOwnerOccupiedLoanMember" id="osbc_ResidentialOwnerOccupiedLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ResidentialRevolvingAndJuniorLiensLoanMember" id="osbc_ResidentialRevolvingAndJuniorLiensLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ImpairedFinancingReceivableRelatedAllowanceAbstract" id="osbc_ImpairedFinancingReceivableRelatedAllowanceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableByAccrualStatusAxis" id="osbc_FinancingReceivableByAccrualStatusAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableRestructuringAxis" id="osbc_FinancingReceivableRestructuringAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableAccrualStatusDomain" id="osbc_FinancingReceivableAccrualStatusDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableRestructuringDomain" id="osbc_FinancingReceivableRestructuringDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccrualMember" id="osbc_AccrualMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonaccrualMember" id="osbc_NonaccrualMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BifurcateMember" id="osbc_BifurcateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HomeAffordableModificationProgramMember" id="osbc_HomeAffordableModificationProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferralMember" id="osbc_DeferralMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableModificationsOutstandingAbstract" id="osbc_FinancingReceivableModificationsOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableModificationsAbstract" id="osbc_FinancingReceivableModificationsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableModificationsSubsequentPaymentDefaultAbstract" id="osbc_FinancingReceivableModificationsSubsequentPaymentDefaultAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableModificationsSubsequentPaymentDefaultRecordedInvestment" id="osbc_FinancingReceivableModificationsSubsequentPaymentDefaultRecordedInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableModificationNumberOfContracts" id="osbc_FinancingReceivableModificationNumberOfContracts" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableModificationsSubsequentPaymentDefaultNumberOfContracts" id="osbc_FinancingReceivableModificationsSubsequentPaymentDefaultNumberOfContracts" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivablePreModificationRecordedInvestment" id="osbc_FinancingReceivablePreModificationRecordedInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivablePostModificationRecordedInvestment" id="osbc_FinancingReceivablePostModificationRecordedInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RestrictedStockAndRestrictedStockUnitsMember" id="osbc_RestrictedStockAndRestrictedStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationTerm" id="osbc_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" id="osbc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateIntrinsicValueAbstract" id="osbc_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateIntrinsicValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock" id="osbc_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueAssetsReportedInLevelOnePurchasePeriod" id="osbc_FairValueAssetsReportedInLevelOnePurchasePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" id="osbc_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageServicingRightsMember" id="osbc_MortgageServicingRightsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" id="osbc_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfEarningsPerShareBasicAndDilutedTable" id="osbc_ScheduleOfEarningsPerShareBasicAndDilutedTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageNumberOfShareBasedPaymentAwards" id="osbc_WeightedAverageNumberOfShareBasedPaymentAwards" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EarningsPerShareBasicAndDilutedLineItems" id="osbc_EarningsPerShareBasicAndDilutedLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards" id="osbc_WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FederalReserveBankTreasuryTaxAndLoanDepositsMember" id="osbc_FederalReserveBankTreasuryTaxAndLoanDepositsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorDebtFacilityMember" id="osbc_SeniorDebtFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAbstract" id="osbc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossAbstract" id="osbc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetExpirations" id="osbc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetExpirations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExpirations" id="osbc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExpirations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ImpairedLoansMember" id="osbc_ImpairedLoansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherRealEstateOwnedMember" id="osbc_OtherRealEstateOwnedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ImpairedFinancingReceivableDecreaseOfSpecificAllocationsWithinProvisionForLoanLosses" id="osbc_ImpairedFinancingReceivableDecreaseOfSpecificAllocationsWithinProvisionForLoanLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LoansFullyChargedCarryingValue" id="osbc_LoansFullyChargedCarryingValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RealEstateGross" id="osbc_RealEstateGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ScheduleOfTroubledDebtRestructuringsOnFinancingReceivablesByTypeOfModificationTableTextBlock" id="osbc_ScheduleOfTroubledDebtRestructuringsOnFinancingReceivablesByTypeOfModificationTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstatePortfolioSegmentMember" id="osbc_RealEstatePortfolioSegmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OutstandingLoanCommitmentsThresholdForCreditQualityCategorizing" id="osbc_OutstandingLoanCommitmentsThresholdForCreditQualityCategorizing" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherRegulatoryCapitalInformationAbstract" id="osbc_OtherRegulatoryCapitalInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentVariableRateBaseAxis" id="osbc_DebtInstrumentVariableRateBaseAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentVariableRateBaseDomain" id="osbc_DebtInstrumentVariableRateBaseDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentVariableRateBaseLIBORMember" id="osbc_DebtInstrumentVariableRateBaseLIBORMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DepositsVariableRateReductionOfBasisPoints" id="osbc_DepositsVariableRateReductionOfBasisPoints" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DepositsDescriptionOfVariableRateBasis" id="osbc_DepositsDescriptionOfVariableRateBasis" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfPreferredStockTable" id="osbc_ScheduleOfPreferredStockTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PreferredStockLineItems" id="osbc_PreferredStockLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent" id="osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent" id="osbc_OtherComprehensiveIncomeLossNetOfTaxPortionOfUnrealizedGainsAttributableToParent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentForRealizedGainLossNetOfTaxPeriodIncreaseDecreaseAbstract" id="osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentForRealizedGainLossNetOfTaxPeriodIncreaseDecreaseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax" id="osbc_OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent" id="osbc_OtherComprehensiveIncomeAvailableForsaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent" id="osbc_OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RealEstateCostOfRealEstateSoldNetOfGainLoss" id="osbc_RealEstateCostOfRealEstateSoldNetOfGainLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RealEstateAcquiredThroughForeclosureOperatingExpenses" id="osbc_RealEstateAcquiredThroughForeclosureOperatingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestRateConcessionBelowNormalMarketMember" id="osbc_InterestRateConcessionBelowNormalMarketMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DepositInterestPayableFairValueDisclosure" id="osbc_DepositInterestPayableFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="RealEstateAcquiredThroughForeclosureRollForwardTableTextBlock" id="osbc_RealEstateAcquiredThroughForeclosureRollForwardTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
</xsd:schema>
