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Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Expenses |  |  |
Junior subordinated debentures interest expense | $ 4,002 | $ 4,334 | $ 4,287
Interest Expense Senor Notes | 2,689 | 112 |
Subordinated debt interest expense |  | 949 | 814
Income before income taxes | 34,302 | 24,504 | 24,361
Income tax benefit | 19,164 | 8,820 | 8,976
Net income | 15,138 | 15,684 | 15,385
Net income available to common stockholders | 15,138 | 15,684 | 13,512
Old Second Bancorp, Inc. |  |  |
Operating Income |  |  |
Cash dividends received from subsidiaries |  |  | 82,777
Other income | 114 | 130 | 131
Total operating income | 114 | 130 | 82,908
Operating Expenses |  |  |
Junior subordinated debentures interest expense | 4,002 | 4,334 | 4,287
Interest Expense Senor Notes | 2,689 | 112 |
Subordinated debt interest expense |  | 949 | 814
Other interest expense |  | 8 | 7
Other expenses | 2,639 | 1,975 | 1,978
Total operating expense | 9,330 | 7,378 | 7,086
Income before income taxes | (9,216) | (7,248) | 75,822
Income tax benefit | (16) | (2,909) | (2,771)
Income (loss) before equity in undistributed net income of subsidiaries | (9,200) | (4,339) | 78,593
Equity in undistributed net income of subsidiaries | 24,338 | 20,023 | (63,208)
Net income | 15,138 | 15,684 | 15,385
Preferred stock dividends and accretion of discount |  |  | 1,873
Net income available to common stockholders | $ 15,138 | $ 15,684 | $ 13,512

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