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Regulatory & Capital Matters - Dividend Restrictions and Deferrals (Details)	9 Months Ended
	Sep. 30, 2019
Dividend Restrictions and Deferrals
Number of previous years retained profit considered for dividend payment	2 years

X

- References

No definition available.

+ Details

Name:	osbc_DividendRestrictionsAndDeferralsAbstract
Namespace Prefix:	osbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of previous years retained profits combined with the current years profits used to determine the amount of dividends that may be paid in any calendar year.

+ References

No definition available.

+ Details

Name:	osbc_DividendRestrictionsNumberOfPreviousYearsRetainedProfit
Namespace Prefix:	osbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration