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Regulatory & Capital Matters - Dividend Restrictions and Deferrals (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended |  |  |
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Feb. 15, 2015 | Dec. 30, 2014 | May 15, 2014 | Apr. 28, 2014 | Apr. 15, 2014 | May 31, 2014 | Mar. 31, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 30, 2014 | Apr. 28, 2014
Dividend Restrictions and Deferrals |  |  |  |  |  |  |  |  |  |  |
Number of previous years retained profit considered for dividend payment |  |  |  |  |  |  | 2 years |  |  |  |
Tier 1 Common Equity, minimum percentage required, 2016 |  |  |  |  |  |  | 0.625%osbc_TierOneCommonEquityCapitalDistributionLimitationMinimumRegulatoryCapitalPercentageNextTwelveMonths |  |  |  |
Tier 1 Common Equity, minimum percentage required, 2017 |  |  |  |  |  |  | 1.25%osbc_TierOneCommonEquityCapitalDistributionLimitationMinimumRegulatoryCapitalPercentageYearTwo |  |  |  |
Tier 1 Common Equity, minimum percentage required, 2018 |  |  |  |  |  |  | 1.875%osbc_TierOneCommonEquityCapitalDistributionLimitationMinimumRegulatoryCapitalPercentageYearThree |  |  |  |
Tier 1 Common Equity, minimum percentage required, 2019 and thereafter |  |  |  |  |  |  | 2.50%osbc_TierOneCommonEquityCapitalDistributionLimitationMinimumRegulatoryCapitalPercentageYearFourAndThereafter |  |  |  |
Junior subordinated debenture |  |  |  |  |  |  | 58,378,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust |  | 58,378,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust |  |
Payments to indentured trustees |  |  |  |  |  |  |  | 19,700,000 osbc_PaymentsForAccruedAndUnpaidInterestOnOutstandingTrustPreferredSecurities |  |  |
Dividends paid |  |  |  |  |  |  | 1,006,000 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock |  |  |  |
Preferred stock, Liquidation value (in dollars per share) |  |  |  |  |  |  | 1,000 us-gaap_PreferredStockLiquidationPreference |  | 1,000 us-gaap_PreferredStockLiquidationPreference |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  | 1,000 us-gaap_PreferredStockLiquidationPreference |  | 1,000 us-gaap_PreferredStockLiquidationPreference |  |
Preferred stock, Shares outstanding |  |  |  |  |  |  | 31,553 us-gaap_PreferredStockSharesOutstanding |  | 47,331 us-gaap_PreferredStockSharesOutstanding |  |
Series B Stock |  |  |  |  |  |  |  |  |  |  |
Dividend Restrictions and Deferrals |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend amount |  |  |  |  | 15,800,000 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Dividends paid | 710,000 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 10,300,000 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | 10,300,000 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Shares redeemed (in shares) |  |  |  | 25,669 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | 15,778 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 25,669 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Repurchase price percentage of liquidation value (as a percent) |  |  |  | 94.75%osbc_PreferredStockRepurchasePricePercentageOfLiquidationValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | 94.75%osbc_PreferredStockRepurchasePricePercentageOfLiquidationValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Preferred stock, Liquidation value (in dollars per share) |  |  |  | $ 947.50 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  | $ 947.50 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 947.50 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  | $ 947.50 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Payments for repurchase of preferred stock |  |  |  | 24,300,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | 24,300,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Benefit from reversal of dividends previously accrued or accumulated and waived by holders upon redemption |  |  |  |  |  |  |  | 5,400,000 osbc_RedeemablePreferredStockDividendsWaivedUponTemporaryEquityRedemption / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Preferred stock, Shares outstanding |  | 47,331 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  | 31,553 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 47,331 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 47,331 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Shares to be redeemed, percent of issued and outstanding |  | 33.33%osbc_StockRedeemedOrCalledDuringPeriodPercentageOfIssuedAndOutstandingShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  | 33.33%osbc_StockRedeemedOrCalledDuringPeriodPercentageOfIssuedAndOutstandingShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Series B Stock | Large private investor |  |  |  |  |  |  |  |  |  |  |
Dividend Restrictions and Deferrals |  |  |  |  |  |  |  |  |  |  |
Payments for repurchase of preferred stock |  |  |  | 22,900,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_TitleOfIndividualAxis = osbc_LargePrivateInvestorMember |  |  |  |  |  |  |
Series B Stock | Directors |  |  |  |  |  |  |  |  |  |  |
Dividend Restrictions and Deferrals |  |  |  |  |  |  |  |  |  |  |
Payments for repurchase of preferred stock |  |  |  | 1,400,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |  |  |
Junior subordinated debentures |  |  |  |  |  |  |  |  |  |  |
Dividend Restrictions and Deferrals |  |  |  |  |  |  |  |  |  |  |
Junior subordinated debenture |  |  |  |  |  |  | 58,400,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember |  |  |  |
Number of statutory business trusts that hold junior subordinated debentures |  |  |  |  |  |  | 2 osbc_NumberOfStatutoryBusinessTrustsHoldingJuniorSubordinatedDebentures / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember |  |  |  |
Junior subordinated debentures | Maximum |  |  |  |  |  |  |  |  |  |  |
Dividend Restrictions and Deferrals |  |  |  |  |  |  |  |  |  |  |
Number of quarterly periods for deferral of interest |  |  |  |  |  |  | 20 osbc_InterestPaymentDefermentPeriod / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |

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- Definition Represents the number of previous years retained profits combined with the current years profits used to determine the amount of dividends that may be paid in any calendar year. + References No definition available. + Details
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- Definition Represents information pertaining to repurchase price percentage of liquidation value of stock. + References No definition available. + Details
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- Definition Represents the amount of dividends payable to preferred stock holders waived upon redemption of temporary equity. + References No definition available. + Details
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- Definition Represents the percentage of issued and outstanding stock redeemed during the period. + References No definition available. + Details
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- Definition The minimum percentage of Tier 1 Common Capital required to be maintained in the next fiscal year following the latest fiscal year to prevent capital distribution limitations under regulatory capital rules. + References No definition available. + Details
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- Definition The minimum percentage of Tier 1 Common Capital required to be maintained in year four and thereafter following the latest fiscal year to prevent capital distribution limitations under regulatory capital rules. + References No definition available. + Details
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- Definition The minimum percentage of Tier 1 Common Capital required to be maintained in year three following the latest fiscal year to prevent capital distribution limitations under regulatory capital rules. + References No definition available. + Details
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- Definition The minimum percentage of Tier 1 Common Capital required to be maintained in year two following the latest fiscal year to prevent capital distribution limitations under regulatory capital rules. + References No definition available. + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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