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Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Assets |  |  |  |
Other assets | $ 17,674 | $ 13,882 |  |
Total assets | 2,077,863 | 2,061,787 |  |
Liabilities and Stockholders' Equity |  |  |  |
Junior subordinated debentures | 58,378 | 58,378 |  |
Subordinated debt | 45,000 | 45,000 |  |
Other liabilities | 9,900 | 12,655 |  |
Stockholders' equity | 155,929 | 194,163 | $ 147,692 | $ 72,552
Total liabilities and stockholders' equity | 2,077,863 | 2,061,787 |  |
Old Second Bancorp, Inc. |  |  |  |
Assets |  |  |  |
Noninterest bearing deposit with bank subsidiary | 33,500 | 7,059 |  |
Investment in subsidiaries | 204,509 | 272,285 |  |
Other assets | 22,951 | 19,940 |  |
Total assets | 260,960 | 299,284 |  |
Liabilities and Stockholders' Equity |  |  |  |
Junior subordinated debentures | 58,378 | 58,378 |  |
Subordinated debt | 45,000 | 45,000 |  |
Other liabilities | 1,653 | 1,743 |  |
Stockholders' equity | 155,929 | 194,163 |  |
Total liabilities and stockholders' equity | $ 260,960 | $ 299,284 |  |

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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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