XML 61 R48.htm IDEA: XBRL DOCUMENT
v3.20.2

Loans and Allowance for Credit Losses on Loans - Nonaccruals (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non accrual including PCI Loans | $ 20,076,000 | $ 15,395,000
Nonaccrual with no ACL including PCI | 15,819,000 | 11,749,000
Interest on nonacccrual loans | 93,000 |
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 1,605,000 | 144,000
Nonaccrual with no ACL | 50,000 |
Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 1,910,000 | 329,000
Nonaccrual with no ACL | 1,910,000 | 70,000
Commercial real estate - Investor |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 2,021,000 | 1,695,000
Nonaccrual with no ACL | 2,021,000 | 1,590,000
Commercial real estate - Owner occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 8,428,000 | 5,180,000
Nonaccrual with no ACL | 5,944,000 | 2,366,000
Real estate - construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  | 93,000
Nonaccrual with no ACL |  | 93,000
Real estate - Investor |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 935,000 | 788,000
Nonaccrual with no ACL | 935,000 | 788,000
Real estate - Owner occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 3,229,000 | 2,572,000
Nonaccrual with no ACL | 3,229,000 | 2,475,000
Multifamily |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 895,000 | 68,000
Nonaccrual with no ACL | 895,000 | 68,000
HELOC |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 1,047,000 | 1,364,000
Nonaccrual with no ACL | 835,000 | 1,154,000
HELOC - Purchased |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  | 180,000
Nonaccrual with no ACL |  | 180,000
Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 6,000 | 19,000
Nonaccrual with no ACL |  | 2,000
PCI |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  | 2,963,000
Nonaccrual with no ACL |  | 2,963,000
Non-PCI |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 20,076,000 | 12,432,000
Nonaccrual with no ACL | $ 15,819,000 | $ 8,786,000

X
- Definition Amount of financing receivable on nonaccrual status including purchased credit impaired loans. + References No definition available. + Details
Name: | osbc_FinancingReceivableNonaccrualIncludingPurchasedCreditImpairedLoans
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable including purchased credit impaired loans on nonaccrual status with no allowance for credit loss. + References No definition available. + Details
Name: | osbc_FinancingReceivableNonaccrualNoAllowanceIncludingPurchasedCreditImpairedLoans
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable on nonaccrual status with no allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
Name: | us-gaap_FinancingReceivableNonaccrualNoAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
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_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_ConstructionLoansMember
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=us-gaap_UnallocatedFinancingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |