Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest and Dividend Income
Loans, including fees	$ 13,218	$ 12,938
Loans held-for-sale	43	25
Securities:
Taxable	3,375us-gaap_InterestIncomeSecuritiesTaxable	3,502us-gaap_InterestIncomeSecuritiesTaxable
Tax exempt	141	148
Dividends from Federal Reserve Bank and Federal Home Loan Bank stock	77us-gaap_DividendIncomeOperating	76us-gaap_DividendIncomeOperating
Interest bearing deposits with financial institutions	12	15
Total interest and dividend income	16,866	16,704
Interest Expense
Savings, NOW, and money market deposits	179	199
Time deposits	807us-gaap_InterestExpenseTimeDeposits	1,321us-gaap_InterestExpenseTimeDeposits
Other short-term borrowings	9	2
Junior subordinated debentures	1,072	1,387
Subordinated debt	197	196
Notes payable and other borrowings	4us-gaap_InterestExpenseDebt	4us-gaap_InterestExpenseDebt
Total interest expense	2,268us-gaap_InterestExpense	3,109us-gaap_InterestExpense
Net interest and dividend income	14,598us-gaap_InterestIncomeExpenseNet	13,595us-gaap_InterestIncomeExpenseNet
Loan loss reserve release		(1,000)
Net interest and dividend income after provision for loan losses	14,598	14,595
Noninterest Income
Trust income	1,486	1,459
Service charges on deposits	1,541	1,720
Secondary mortgage fees	244	112
Mortgage servicing loss, net of changes in fair value	(208)us-gaap_ServicingFeesNet	(47)us-gaap_ServicingFeesNet
Net gain on sales of mortgage loans	1,623us-gaap_GainLossOnSaleOfMortgageLoans	662us-gaap_GainLossOnSaleOfMortgageLoans
Securities loss, net	(109)us-gaap_GainLossOnSaleOfSecuritiesNet	(69)us-gaap_GainLossOnSaleOfSecuritiesNet
Increase in cash surrender value of bank-owned life insurance	354us-gaap_BankOwnedLifeInsuranceIncome	358us-gaap_BankOwnedLifeInsuranceIncome
Debit card interchange income	959osbc_CardInterchangeIncomeDebit	830osbc_CardInterchangeIncomeDebit
Other income	2,083	1,296
Total noninterest income	7,973us-gaap_NoninterestIncome	6,321us-gaap_NoninterestIncome
Noninterest Expense
Salaries and employee benefits	9,255us-gaap_LaborAndRelatedExpense	9,101us-gaap_LaborAndRelatedExpense
Occupancy expense, net	1,271us-gaap_OccupancyNet	1,481us-gaap_OccupancyNet
Furniture and equipment expense	1,001us-gaap_EquipmentExpense	983us-gaap_EquipmentExpense
FDIC insurance	273	279
General bank insurance	357us-gaap_GeneralInsuranceExpense	489us-gaap_GeneralInsuranceExpense
Amortization of core deposit		512us-gaap_AmortizationOfIntangibleAssets
Advertising expense	205us-gaap_AdvertisingExpense	303us-gaap_AdvertisingExpense
Debit card interchange expense	352osbc_DebitCardInterchangeExpense	378osbc_DebitCardInterchangeExpense
Legal fees	223us-gaap_LegalFees	257us-gaap_LegalFees
Other real estate expense, net	1,352osbc_OtherRealEstateOwnedExpense	1,008osbc_OtherRealEstateOwnedExpense
Other expense	2,864us-gaap_OtherNoninterestExpense	2,725us-gaap_OtherNoninterestExpense
Total noninterest expense	17,153us-gaap_NoninterestExpense	17,516us-gaap_NoninterestExpense
Income before income taxes	5,418	3,400
Provision for income taxes	1,919us-gaap_IncomeTaxExpenseBenefit	1,198us-gaap_IncomeTaxExpenseBenefit
Net income	3,499us-gaap_NetIncomeLoss	2,202us-gaap_NetIncomeLoss
Preferred stock dividends and accretion of discount	824	1,572
Net income available to common stockholders	$ 2,675	$ 630
Basic earnings per share (in dollars per share)	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted

Income earned from debit card services for the reporting period.

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This element represents the debit card interchange expense.

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- Definition

This element represents the other real estate owned expense during the period.

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Amount of expense (income) related to provision for or (release of) provision for estimated loss from loan and lease transactions.

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No definition available.

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The amount of adjustment to net income for preferred stock dividends and accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

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No definition available.

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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Amount of operating dividend income on securities.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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No definition available.

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- Definition

Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.

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The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets.

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- Definition

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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- Definition

The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales).

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- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Interest and fee income from mortgage loans considered to be held-for-sale.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Interest expense incurred during the reporting period on junior subordinated debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

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The aggregate interest expense incurred on the following for deposits in domestic offices: (1) transaction accounts (NOW, and telephone and preauthorized transfer accounts), (2) money market deposits and (3) savings deposits.

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The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

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Interest expense incurred during the reporting period on subordinated notes and debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

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The aggregate interest expense incurred on time deposits, including certificates of deposits, in domestic offices.

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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The net amount of operating interest income (expense).

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Total aggregate amount of all noninterest expense.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

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