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Summary of Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net interest income	$ 107,617	$ 87,505	$ 73,379
Net income	$ 34,012	$ 15,138	$ 15,684
Diluted earnings per share (in dollars per share)	$ 1.12	$ 0.50	$ 0.53
Old Second Bancorp, Inc.
Net income	$ 34,012	$ 15,138	$ 15,684

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