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Parent Company Condensed Financial Information -Condensed Statements of Cash Flows (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash Flows from Operating Activities |  |  |
Net income | $ 15,138,000 | $ 15,684,000 | $ 15,385,000
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |
Provision for deferred tax expense (benefit) | 21,571,000 | 8,421,000 | 8,756,000
Net deferred tax expense due to DTA revaluation | 13,662,000 | 8,421,000 | 8,756,000
Change in taxes payable | (2,519,000) | 260,000 | 100,000
Stock-based compensation | 1,181,000 | 657,000 | 613,000
Net cash provided by (used in) operating activities | 37,105,000 | 27,256,000 | 21,137,000
Cash Flows from Financing Activities |  |  |
Dividends paid on preferred stock |  |  | (2,417,000)
Dividends paid common stock | (1,184,000) | (888,000) |
Purchases of treasury stock | (236,000) | (254,000) | (117,000)
Proceeds From Issuance Of Senior Notes |  | 43,994,000 |
Payment of senior note issuance costs | (42,000) |  |
Repayment of subordinate debt |  | (45,000,000) |
Proceeds from (Repayments of) Notes Payable |  | (500,000) |
Proceeds from Stock Options Exercised |  | 11,000 |
Redemption of preferred stock |  |  | (47,331,000)
Net cash (used in) provided by financing activities | 103,881,000 | 102,813,000 | 7,200,000
Net change in cash and cash equivalents | 8,499,000 | 6,996,000 | (3,859,000)
Cash and cash equivalents at beginning of period | 47,334,000 | 40,338,000 | 44,197,000
Cash and cash equivalents at end of period | 55,833,000 | 47,334,000 | 40,338,000
Old Second Bancorp, Inc. |  |  |
Cash Flows from Operating Activities |  |  |
Net income | 15,138,000 | 15,684,000 | 15,385,000
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |
Equity in undistributed net income of subsidiaries | (24,338,000) | (20,023,000) | 63,208,000
Provision for deferred tax expense (benefit) | 6,397,000 | (1,039,000) | (2,806,000)
Net deferred tax expense due to DTA revaluation | 3,908,000 |  |
Change in taxes payable | (4,797,000) | 330,000 | (199,000)
Change in other assets | 74,000 | 171,000 | 36,000
Stock-based compensation | 1,181,000 | 657,000 | 613,000
Other, net | (15,000) | 282,000 | 69,000
Net cash provided by (used in) operating activities | (2,452,000) | (3,938,000) | 76,306,000
Cash Flows from Financing Activities |  |  |
Dividends paid on preferred stock |  |  | (2,417,000)
Dividends paid common stock | (1,184,000) | (888,000) |
Purchases of treasury stock | (236,000) | (254,000) | (117,000)
Proceeds From Issuance Of Senior Notes |  | 43,994,000 |
Payment of senior note issuance costs | (42,000) |  |
Repayment of subordinate debt |  | (45,000,000) |
Proceeds from (Repayments of) Notes Payable |  | (500,000) |
Proceeds from Stock Options Exercised |  | 11,000 |
Redemption of preferred stock |  |  | (47,331,000)
Net cash (used in) provided by financing activities | (1,462,000) | (2,637,000) | (49,865,000)
Net change in cash and cash equivalents | (3,914,000) | (6,575,000) | 26,441,000
Cash and cash equivalents at beginning of period | 26,925,000 | 33,500,000 | 7,059,000
Cash and cash equivalents at end of period | $ 23,011,000 | $ 26,925,000 | $ 33,500,000

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