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Borrowings - Maturities and Weighted Average Rates (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Scheduled maturities and weighted average rates of borrowings |  |
Year one | $ 66,036 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths | $ 27,560 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Year four | 45,500 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour | 45,500 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Thereafter | 58,378 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive | 58,378 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total | $ 169,914 us-gaap_DebtLongtermAndShorttermCombinedAmount | $ 131,438 us-gaap_DebtLongtermAndShorttermCombinedAmount
Weighted Average Rate |  |
Year one (as a percent) | 0.09%osbc_DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInNextTwelveMonths | 0.02%osbc_DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInNextTwelveMonths
Year four (as a percent) | 1.75%osbc_LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInYearFour | 1.76%osbc_LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateInYearFour
Thereafter (as a percent) | 7.35%osbc_LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateAfterYearFive | 7.35%osbc_LongTermDebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRateAfterYearFive
Total (as a percent) | 3.03%osbc_DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRate | 3.88%osbc_DebtMaturitiesRepaymentsOfPrincipalWeightedAverageInterestRate

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- Definition The weighted average interest rate applicable to debt (including short-term and current portion of long term debt). + References No definition available. + Details
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- Definition The weighted average interest rate applicable to debt (including short-term and current portion of long term debt) maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements. + References No definition available. + Details
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- Definition The weighted average interest rate applicable to long-term debt maturing after year five following the date of the latest balance sheet presented in the financial statements. + References No definition available. + Details
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- Definition The weighted average interest rate applicable to long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements. + References No definition available. + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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