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Loans and Allowance for Credit Losses on Loans - Loans In Active Deferral (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	$ 32,745
Loans modified under CARES Act, in nonaccrual, within deferral above	4,350
1st Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	9,431
Loans modified under CARES Act, in nonaccrual, within deferral above	999
2nd Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	19,906
Loans modified under CARES Act, in nonaccrual, within deferral above	1,230
3rd Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	3,408
Loans modified under CARES Act, in nonaccrual, within deferral above	$ 2,121

X

- Definition

Amount of financing receivable modified as Coronavirus Aid, Relief, and Economic Security Act (CARES Act).

+ References

No definition available.

+ Details

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Namespace Prefix:	osbc_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable modified which are non-accrual as Coronavirus Aid, Relief, and Economic Security Act (CARES Act).

+ References

No definition available.

+ Details

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Namespace Prefix:	osbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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