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Commitments - Summary of Financial Instrument Commitments (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fixed |  |
Financial instrument commitments |  |
Financial instrument commitments | $ 471 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember | $ 1,590 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember
Loan commitments | 62,391 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember | 60,681 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember
Fixed | Borrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 471 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember | 1,590 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember
Fixed | Borrower | Financial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 55 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember | 10 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember
Fixed | Borrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 416 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember | 1,580 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_FixedLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember
Variable |  |
Financial instrument commitments |  |
Financial instrument commitments | 11,056 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember | 7,527 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember
Loan commitments | 169,717 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember | 185,581 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember
Variable | Borrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 10,484 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember | 6,660 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember
Variable | Borrower | Financial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 4,745 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember | 3,886 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember
Variable | Borrower | Commercial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 49 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember | 51 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember
Variable | Borrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 5,690 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember | 2,723 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember
Variable | Nonborrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 572 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditNonborrowersMember | 867 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditNonborrowersMember
Variable | Nonborrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 572 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditNonborrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember | 867 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = osbc_VariableLettersOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditNonborrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember
Total. |  |
Financial instrument commitments |  |
Financial instrument commitments | 11,527 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | 9,117 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
Loan commitments | 232,108 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | 246,262 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
Total. | Borrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 10,955 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember | 8,250 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember
Total. | Borrower | Financial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 4,800 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember | 3,896 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember
Total. | Borrower | Commercial standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 49 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember | 51 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember
Total. | Borrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | 6,106 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember | 4,303 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditToBorrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember
Total. | Nonborrower |  |
Financial instrument commitments |  |
Financial instrument commitments | 572 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditNonborrowersMember | 867 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditNonborrowersMember
Total. | Nonborrower | Performance standby |  |
Financial instrument commitments |  |
Financial instrument commitments | $ 572 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditNonborrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember | $ 867 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_FinancialInstrumentAxis = osbc_CommitmentsToExtendCreditNonborrowersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_PerformanceGuaranteeMember

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