XML 62 R45.htm IDEA: XBRL DOCUMENT v3.20.1

Loans and Allowance for Credit Losses on Loans - Collateral dependent loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	$ 25,039
ACL Allocation	30,045	$ 19,789
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	22,347
Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,416
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	276
Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	1,867
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,419
Commercial | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,416
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3
Commercial | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	89
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	264
Leases | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	264
Leases | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	61
Commercial real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4,430
Commercial real estate - Investor | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4,430
Commercial real estate - Investor | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	203
Commercial real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	8,459
Commercial real estate - Owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	8,459
Commercial real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	204
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,245
Construction | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,245
Construction | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	852
Real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	859
Real estate - Investor | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	859
Real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,739
Real estate - Owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,739
Real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	137
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,497
Multifamily | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,497
Multifamily | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	318
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,004
HELOC | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,004
HELOC - Purchased
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	114
HELOC - Purchased | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	114
Other 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	9
Other 1 | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	9
Other 1 | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	$ 3

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

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5086-111524

+ Details

Name:	us-gaap_LoansPledgedAsCollateral
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_FinanceReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=osbc_OtherLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_CollateralPledgedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_CommercialRealEstateInvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_CommercialRealEstateOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_RealEstateInvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_RealEstateOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_MultiFamilyLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_HelocPurchasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_Other1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: