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Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Other assets | $ 22,776 | $ 16,333 |  |
Total assets | 2,383,429 | 2,251,188 |  |
Liabilities and Stockholders' Equity |  |  |  |
Junior subordinated debentures | 57,639 | 57,591 |  |
Senior Notes | 44,058 | 43,998 |  |
Other liabilities | 13,539 | 11,889 |  |
Stockholders' equity | 200,350 | 175,210 | $ 155,929 | $ 194,163
Total liabilities and stockholders' equity | 2,383,429 | 2,251,188 |  |
Old Second Bancorp, Inc. |  |  |  |
Assets |  |  |  |
Noninterest bearing deposit with bank subsidiary | 23,011 | 26,925 |  |
Investment in subsidiaries | 263,389 | 228,646 |  |
Other assets | 17,139 | 23,304 |  |
Total assets | 303,539 | 278,875 |  |
Liabilities and Stockholders' Equity |  |  |  |
Junior subordinated debentures | 57,639 | 57,591 |  |
Senior Notes | 44,058 | 43,998 |  |
Other liabilities | 1,492 | 2,076 |  |
Stockholders' equity | 200,350 | 175,210 |  |
Total liabilities and stockholders' equity | $ 303,539 | $ 278,875 |  |

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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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- 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 + Details
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