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Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Assets |  |  |  |
Other assets | $ 16,333 | $ 15,818 |  |
Total assets | 2,251,188 | 2,077,028 |  |
Liabilities and Stockholders' Equity |  |  |  |
Junior subordinated debentures | 57,591 | 57,543 |  |
Senior Notes | 43,998 |  |  |
Subordinated debt |  | 45,000 |  |
Other liabilities | 11,889 | 9,900 |  |
Stockholders' equity | 175,210 | 155,929 | $ 194,163 | $ 147,692
Total liabilities and stockholders' equity | 2,251,188 | 2,077,028 |  |
Old Second Bancorp, Inc. |  |  |  |
Assets |  |  |  |
Noninterest bearing deposit with bank subsidiary | 26,925 | 33,500 |  |
Investment in subsidiaries | 228,646 | 204,509 |  |
Other assets | 23,304 | 22,116 |  |
Total assets | 278,875 | 260,125 |  |
Liabilities and Stockholders' Equity |  |  |  |
Junior subordinated debentures | 57,591 | 57,543 |  |
Senior Notes | 43,998 |  |  |
Subordinated debt |  | 45,000 |  |
Other liabilities | 2,076 | 1,653 |  |
Stockholders' equity | 175,210 | 155,929 |  |
Total liabilities and stockholders' equity | $ 278,875 | $ 260,125 |  |

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