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Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Expenses |  |  |
Junior subordinated debentures | $ 3,716 | $ 4,002 | $ 4,334
Senior notes | 2,688 | 2,689 | 112
Subordinated debt |  |  | 949
Income (loss) before income taxes and equity in undistributed net income of subsidiaries | 43,936 | 34,302 | 24,504
Income tax benefit | 9,924 | 19,164 | 8,820
Net income available to common stockholders | 34,012 | 15,138 | 15,684
Old Second Bancorp, Inc. |  |  |
Operating Income |  |  |
Cash dividends received from subsidiaries | 30,000 |  |
Other income | 106 | 114 | 130
Total operating income | 30,106 | 114 | 130
Operating Expenses |  |  |
Junior subordinated debentures | 3,716 | 4,002 | 4,334
Senior notes | 2,688 | 2,689 | 112
Subordinated debt |  |  | 949
Other interest expense | 98 |  | 8
Other expenses | 4,208 | 2,639 | 1,975
Total operating expense | 10,710 | 9,330 | 7,378
Income (loss) before income taxes and equity in undistributed net income of subsidiaries | 19,396 | (9,216) | (7,248)
Income tax benefit | (3,355) | (16) | (2,909)
Income (loss) before equity in undistributed net income of subsidiaries | 22,751 | (9,200) | (4,339)
Equity in undistributed net income of subsidiaries | 11,261 | 24,338 | 20,023
Net income available to common stockholders | $ 34,012 | $ 15,138 | $ 15,684

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