XML 59 R42.htm IDEA: XBRL DOCUMENT v3.20.4

Mortgage Banking Derivatives (Tables)

12 Months Ended

Dec. 31, 2020

Not Designated as Hedging Instrument [Member] | Mortgage Banking Derivatives

Mortgage Banking Derivatives

Schedule of the effect of fair value and cash flow hedge accounting

​

​	​	​	​	​	​	​	​
​		2020			2019
Forward contracts:	​	​	​	​	​	​	​
Notional amount	​	$	46,500	​	$	13,500	​
Fair value	​		(228)	​		(15)	​
​	​	​	​	​	​	​	​
Rate lock commitments:	​	​	​	​	​	​	​
Notional amount	​	$	37,972	​	$	10,167	​
Fair value	​		1,068	​		265	​

X

- References

No definition available.

+ Details

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

X

- Definition

Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4E
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624181-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

+ Details

Name:	us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=osbc_MortgageBankingDerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: