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Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Expenses |  |  |
Junior subordinated debentures interest expense | $ 4,334 | $ 4,287 | $ 4,919
Interest Expense, Senior Notes | 112 |  |
Subordinated debt interest expense | 949 | 814 | 792
Income before income taxes | 24,504 | 24,361 | 15,897
Income tax benefit | 8,820 | 8,976 | 5,761
Net income | 15,684 | 15,385 | 10,136
Dividends waived upon preferred stock redemption |  |  | (5,433)
Gain on preferred stock redemption |  |  | (1,348)
Net income available to common stockholders | 15,684 | 13,512 | 11,855
Old Second Bancorp, Inc. |  |  |
Operating Income |  |  |
Cash dividends received from subsidiaries |  | 82,777 |
Other income | 130 | 131 | 231
Total operating income | 130 | 82,908 | 231
Operating Expenses |  |  |
Junior subordinated debentures interest expense | 4,334 | 4,287 | 4,919
Interest Expense, Senior Notes | 112 |  |
Subordinated debt interest expense | 949 | 814 | 792
Other interest expense | 8 | 7 | 16
Other expenses | 1,975 | 1,978 | 1,045
Total operating expense | 7,378 | 7,086 | 6,772
Income before income taxes | (7,248) | 75,822 | (6,541)
Income tax benefit | (2,909) | (2,771) | (2,305)
Income (loss) before equity in undistributed net income of subsidiaries | (4,339) | 78,593 | (4,236)
Equity in undistributed net income of subsidiaries | 20,023 | (63,208) | 14,372
Net income | 15,684 | 15,385 | 10,136
Preferred stock dividends and accretion of discount |  | 1,873 | 5,062
Dividends waived upon preferred stock redemption |  |  | (5,433)
Gain on preferred stock redemption |  |  | (1,348)
Net income available to common stockholders | $ 15,684 | $ 13,512 | $ 11,855

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