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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2015
Employee Benefit Plans
Employee Benefit Plans	Note 22: Employee Benefit Plans Old Second Bancorp, Inc. Employees 401(k) Savings Plan and Trust The Company sponsors a qualified, tax-exempt defined contribution plan (the “Plan”) qualifying under section 401(k) of the Internal Revenue Code. Virtually all employees are eligible to participate after meeting certain age and service requirements. Eligible employees are permitted to contribute up to a dollar limit set by law of their compensation to the Plan. For the years ended December 31, 2015, 2014 and 2013, a discretionary match equal to 100% of the first 2% of the participant’s compensation was contributed to participants of the Plan. Participants are 100% vested in the discretionary matching contributions. The profit sharing portion of the Plan arrangement provides an annual discretionary contribution to the retirement account of each employee based in part on the Company’s profitability in a given year, and on each participant’s annual compensation. Participants can choose between several different investment options under the Plan, including shares of the Company’s common stock. The total expense relating to the Plan was approximately $464,000, $477,000 and $468,000 in 2015, 2014 and 2013, respectively. Old Second Bancorp, Inc. Voluntary Deferred Compensation Plan for Executives The Company sponsors an executive deferred compensation plan, which is a means by which certain executives may voluntarily defer a portion of their salary or bonus. This plan is an unfunded, nonqualified deferred compensation arrangement. Company obligations under this arrangement as of December 31, 2015, 2014 and 2013 were $1.6 million, $1.9 million and $1.8 million, respectively, and are included in other liabilities.