XML 16 R55.htm IDEA: XBRL DOCUMENT v2.4.0.8

Earnings Per Share - Preferred Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	0 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended
	Sep. 30, 2014	Apr. 28, 2014 Series B Stock	Sep. 30, 2014 Series B Stock	Jun. 30, 2014 Series B Stock	Apr. 30, 2014 Common	Jun. 30, 2014 Common
Redemption of stock
Shares redeemed (in shares)		25,669		25,669
Shares issued					15,525,000
Net proceeds from sale of common stock	$ 64,395		$ 64,000			$ 64,000
Repurchase price percentage of liquidation value (as a percent)		94.75%		94.75%
Benefit from redemptions at below liquidation value	1,348
Benefit from reversal of dividends previously accrued or accumulated and waived by holders upon redemption	$ 5,433		$ 5,400

X

- Definition

Represents information pertaining to repurchase price percentage of liquidation value of stock.

+ References

No definition available.

+ Details

Name:	osbc_PreferredStockRepurchasePricePercentageOfLiquidationValue
Namespace Prefix:	osbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of dividends payable to preferred stock holders waived upon redemption of temporary equity.

+ References

No definition available.

+ Details

Name:	osbc_RedeemablePreferredStockDividendsWaivedUponTemporaryEquityRedemption
Namespace Prefix:	osbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_EarningsPerShareDilutedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The excess of (1) the carrying amount of the preferred stock in the registrant's balance sheet over (2) the fair value of the consideration transferred to the holders of the preferred stock, during the accounting period, which will be added to net earnings to arrive at net earnings available to common shareholders in the calculation of earnings per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section S99

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695

+ Details

Name:	us-gaap_PreferredStockRedemptionDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

Name:	us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration