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Regulatory & Capital Matters (Details)	Dec. 31, 2018	Dec. 31, 2017
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	10.08%	10.08%
Risk-based capital ratio (as a percent)	12.63%	12.93%
Old Second National Bank
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	11.36%	10.79%
Risk-based capital ratio (as a percent)	14.14%	13.78%
Minimum | Old Second National Bank
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	8.00%
Risk-based capital ratio (as a percent)	12.00%

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- Definition

Total Capital divided by risk weighted assets as defined in the regulations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
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