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Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Assets |  |  |  |
Other assets | $ 13,882 us-gaap_OtherAssets | $ 14,284 us-gaap_OtherAssets |  |
Total assets | 2,061,787 us-gaap_Assets | 2,004,034 us-gaap_Assets |  |
Liabilities and Stockholders' Equity |  |  |  |
Junior subordinated debentures | 58,378 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust | 58,378 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust |  |
Subordinated debt | 45,000 us-gaap_SubordinatedDebt | 45,000 us-gaap_SubordinatedDebt |  |
Other liabilities | 12,655 us-gaap_OtherLiabilities | 42,776 us-gaap_OtherLiabilities |  |
Stockholders' equity | 194,163 us-gaap_StockholdersEquity | 147,692 us-gaap_StockholdersEquity | 72,552 us-gaap_StockholdersEquity | 74,002 us-gaap_StockholdersEquity
Total liabilities and stockholders' equity | 2,061,787 us-gaap_LiabilitiesAndStockholdersEquity | 2,004,034 us-gaap_LiabilitiesAndStockholdersEquity |  |
Old Second Bancorp, Inc. |  |  |  |
Assets |  |  |  |
Noninterest bearing deposit with bank subsidiary | 7,059 osbc_NoninterestBearingDepositsInBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,071 osbc_NoninterestBearingDepositsInBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries | 272,285 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 258,588 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 19,940 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18,766 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 299,284 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 279,425 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Junior subordinated debentures | 58,378 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 58,378 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Subordinated debt | 45,000 us-gaap_SubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 45,000 us-gaap_SubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities | 1,743 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 28,355 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Stockholders' equity | 194,163 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 147,692 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders' equity | $ 299,284 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 279,425 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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