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Parent Company Condensed Financial Information -Condensed Statements of Cash Flows (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows from Operating Activities |  |  |
Net income | $ 34,012,000 | $ 15,138,000 | $ 15,684,000
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |
Provision for deferred tax expense (benefit) | 9,840,000 | 21,571,000 | 8,421,000
Net deferred tax expense due to DTA revaluation | 9,840,000 | 13,662,000 | 8,421,000
Change in taxes payable | 1,678,000 | (2,519,000) | 260,000
Stock-based compensation | 2,257,000 | 1,181,000 | 657,000
Net cash provided by operating activities | 54,907,000 | 37,105,000 | 27,256,000
Cash paid for acquisition, net of cash and cash equivalent retained | (35,711,000) |  | (181,357,000)
Net cash provided by (used in) investing activities | (25,841,000) | (132,487,000) | (123,073,000)
Cash Flows from Financing Activities |  |  |
Net change in other short-term borrowings | 23,625,000 | 45,000,000 | 55,000,000
Dividends paid common stock | (1,189,000) | (1,184,000) | (888,000)
Purchases of treasury stock | (505,000) | (236,000) | (254,000)
Proceeds from the issuance of senior notes |  |  | 43,994,000
Payment of senior note issuance costs |  | (42,000) |
Repayment of subordinate debt |  |  | (45,000,000)
Repayments of notes payable | (8,069,000) |  | (500,000)
Proceeds from exercise of stock options | 33,000 |  | 11,000
Net cash (used in) provided by financing activities | (29,664,000) | 103,881,000 | 102,813,000
Net change in cash and cash equivalents | (598,000) | 8,499,000 | 6,996,000
Cash and cash equivalents at beginning of period | 55,833,000 | 47,334,000 | 40,338,000
Cash and cash equivalents at end of period | 55,235,000 | 55,833,000 | 47,334,000
Old Second Bancorp, Inc. |  |  |
Cash Flows from Operating Activities |  |  |
Net income | 34,012,000 | 15,138,000 | 15,684,000
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |
Equity in undistributed net income of subsidiaries | (11,261,000) | (24,338,000) | (20,023,000)
Provision for deferred tax expense (benefit) | 6,697,000 | 6,397,000 | (1,039,000)
Net deferred tax expense due to DTA revaluation |  | 3,908,000 |
Change in taxes payable | (1,211,000) | (4,797,000) | 330,000
Change in other assets | 97,000 | 74,000 | 171,000
Stock-based compensation | 2,257,000 | 1,181,000 | 657,000
Other, net | 172,000 | (15,000) | 282,000
Net cash provided by operating activities | 30,763,000 | (2,452,000) | (3,938,000)
Cash paid for acquisition, net of cash and cash equivalent retained | (47,074,000) |  |
Net cash provided by (used in) investing activities | (47,074,000) |  |
Cash Flows from Financing Activities |  |  |
Net change in other short-term borrowings | 4,000,000 |  |
Dividends paid common stock | (1,189,000) | (1,184,000) | (888,000)
Purchases of treasury stock | (505,000) | (236,000) | (254,000)
Proceeds from the issuance of senior notes |  |  | 43,994,000
Payment of senior note issuance costs |  | (42,000) |
Repayment of subordinate debt |  |  | (45,000,000)
Repayments of notes payable |  |  | (500,000)
Proceeds from exercise of stock options | 33,000 |  | 11,000
Net cash (used in) provided by financing activities | 2,339,000 | (1,462,000) | (2,637,000)
Net change in cash and cash equivalents | (13,972,000) | (3,914,000) | (6,575,000)
Cash and cash equivalents at beginning of period | 23,011,000 | 26,925,000 | 33,500,000
Cash and cash equivalents at end of period | $ 9,039,000 | $ 23,011,000 | $ 26,925,000

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