XML 99 R82.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Commitments - Summary of Financial Instrument Commitments (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fixed |  |
Financial instrument commitments |  |
Financial instrument commitments | $ 126 | $ 471
Loan commitments | 71,016 | 62,391
Fixed | Borrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 126 | 471
Fixed | Borrower | Financial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 60 | 55
Fixed | Borrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 66 | 416
Variable |  |
Financial instrument commitments |  |
Financial instrument commitments | 11,544 | 11,056
Loan commitments | 197,909 | 169,717
Variable | Borrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 10,969 | 10,484
Variable | Borrower | Financial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 3,572 | 4,745
Variable | Borrower | Commercial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 47 | 49
Variable | Borrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 7,350 | 5,690
Variable | Nonborrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 575 | 572
Variable | Nonborrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 575 | 572
Total. |  |
Financial instrument commitments |  |
Financial instrument commitments | 11,670 | 11,527
Loan commitments | 268,925 | 232,108
Total. | Borrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 11,095 | 10,955
Total. | Borrower | Financial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 3,632 | 4,800
Total. | Borrower | Commercial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 47 | 49
Total. | Borrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 7,416 | 6,106
Total. | Nonborrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 575 | 572
Total. | Nonborrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | $ 575 | $ 572

X
- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CreditFacilityAxis=osbc_FixedLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=osbc_CommitmentsToExtendCreditToBorrowersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_PerformanceGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=osbc_VariableLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=osbc_CommitmentsToExtendCreditNonborrowersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |