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Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |
Other assets | $ 23,473 | $ 22,776 |  |
Total assets | 2,676,003 | 2,383,429 |  |
Liabilities and Stockholders' Equity |  |  |  |
Other short-term borrowings | 149,500 | 115,000 |  |
Junior subordinated debentures | 57,686 | 57,639 |  |
Senior Notes | 44,158 | 44,058 |  |
Other liabilities | 16,894 | 13,539 |  |
Stockholders' equity | 229,081 | 200,350 | $ 175,210 | $ 155,929
Total liabilities and stockholders' equity | 2,676,003 | 2,383,429 |  |
Old Second Bancorp, Inc. |  |  |  |
Assets |  |  |  |
Noninterest bearing deposit with bank subsidiary | 9,039 | 23,011 |  |
Investment in subsidiaries | 315,252 | 263,389 |  |
Other assets | 12,997 | 17,139 |  |
Total assets | 337,288 | 303,539 |  |
Liabilities and Stockholders' Equity |  |  |  |
Other short-term borrowings | 4,000 |  |  |
Junior subordinated debentures | 57,686 | 57,639 |  |
Senior Notes | 44,158 | 44,058 |  |
Other liabilities | 2,363 | 1,492 |  |
Stockholders' equity | 229,081 | 200,350 |  |
Total liabilities and stockholders' equity | $ 337,288 | $ 303,539 |  |

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