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Loans and Allowance for Credit Losses on Loans - Loans In Active Deferral (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	$ 8,829
Loans modified under CARES Act, in nonaccrual, within deferral above	4,601
2nd Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	6,752
Loans modified under CARES Act, in nonaccrual, within deferral above	2,524
3rd Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	2,077
Loans modified under CARES Act, in nonaccrual, within deferral above	$ 2,077

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_
Data Type:	xbrli:monetaryItemType
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

Name:	osbc_FinancialReceivablesLoanModificationNonAccrualCoronavirusAidReliefAndEconomicSecurityAct
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

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=osbc_PaymentDeferralTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=osbc_PaymentDeferralThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: