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v2.4.1.9

Loans - Related Parties (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Loans to principal officers, directors, and their affiliates |  |
Beginning balance | $ 6,414 us-gaap_LoansAndLeasesReceivableRelatedParties | $ 3,586 us-gaap_LoansAndLeasesReceivableRelatedParties
New loans | 41,810 us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions | 27,616 us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Repayments and other reductions | (38,295)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections | (24,831)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Change in related party status | (2,136)osbc_LoansAndLeasesReceivableRelatedPartiesIncreaseDecreaseDueToChangeInRelatedPartyStatus | 43 osbc_LoansAndLeasesReceivableRelatedPartiesIncreaseDecreaseDueToChangeInRelatedPartyStatus
Ending balance | 7,793 us-gaap_LoansAndLeasesReceivableRelatedParties | 6,414 us-gaap_LoansAndLeasesReceivableRelatedParties
Loans to related parties greater than 90 days past due |  | 87 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Principal Officers, Directors, and Affiliates |  |
Loans to principal officers, directors, and their affiliates |  |
Loans to related parties greater than 90 days past due | $ 0 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = osbc_ManagementAndAffiliatesMember | $ 0 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = osbc_ManagementAndAffiliatesMember

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- Definition Represents the change in amount of loans and lease receivables to related party, due to a change in status of related party. + References No definition available. + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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- Definition Reflects the amount of new advances made to related parties in the form of loan and lease receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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- Definition Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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