XML 43 R32.htm IDEA: XBRL DOCUMENT
v3.23.2

Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |
Schedule of fair value of derivative financial instruments as well as their classification on the Balance Sheet | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | June 30, 2023
​ | No. of Trans. | ​ | Notional Amount $ | ​ | Balance Sheet Location | Fair Value $ | ​ | Balance Sheet Location | Fair Value $
Derivatives designated as hedging instruments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate swap agreements | 5 | ​ | 325,774 | ​ | Other Assets | 2,623 | ​ | Other Liabilities | 9,911
Total derivatives designated as hedging instruments | ​ | ​ | ​ | ​ | ​ | 2,623 | ​ | ​ | 9,911
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivatives not designated as hedging instruments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate swaps with commercial loan customers | 18 | ​ | 106,379 | ​ | Other Assets | 3,829 | ​ | Other Liabilities | 3,829
Interest rate lock commitments and forward contracts | 40 | ​ | 10,029 | ​ | Other Assets | 77 | ​ | Other Liabilities | -
Other contracts | 4 | ​ | 43,994 | ​ | Other Assets | 108 | ​ | Other Liabilities | -
Total derivatives not designated as hedging instruments | ​ | ​ | ​ | ​ | ​ | 4,014 | ​ | ​ | 3,829
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | December 31, 2022
​ | No. of Trans. | ​ | Notional Amount $ | ​ | Balance Sheet Location | Fair Value $ | ​ | Balance Sheet Location | Fair Value $
Derivatives designated as hedging instruments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate swap agreements | 4 | ​ | 275,774 | ​ | Other Assets | 2,737 | ​ | Other Liabilities | 8,610
Total derivatives designated as hedging instruments | ​ | ​ | ​ | ​ | ​ | 2,737 | ​ | ​ | 8,610
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivatives not designated as hedging instruments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate swaps with commercial loan customers | 21 | ​ | 110,647 | ​ | Other Assets | 3,654 | ​ | Other Liabilities | 3,654
Interest rate lock commitments and forward contracts | 28 | ​ | 5,298 | ​ | Other Assets | 76 | ​ | Other Liabilities | -
Other contracts | 4 | ​ | 43,699 | ​ | Other Assets | 125 | ​ | Other Liabilities | 1
Total derivatives not designated as hedging instruments | ​ | ​ | ​ | ​ | ​ | 3,855 | ​ | ​ | 3,655
Schedule of financial instrument commitments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2023 | ​ | December 31, 2022 | ​
​ |  | Fixed |  | Variable |  | Total |  | Fixed |  | Variable |  | Total |
Letters of credit: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Borrower: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Financial standby | ​ | $ | 2,116 | ​ | $ | 16,370 | ​ | $ | 18,486 | ​ | $ | 3,514 | ​ | $ | 15,365 | ​ | $ | 18,879 | ​
Performance standby | ​ | ​ | 1,513 | ​ | ​ | 12,511 | ​ | ​ | 14,024 | ​ | ​ | 3,161 | ​ | ​ | 13,989 | ​ | ​ | 17,150 | ​
​ | ​ | ​ | 3,629 | ​ | ​ | 28,881 | ​ | ​ | 32,510 | ​ | ​ | 6,675 | ​ | ​ | 29,354 | ​ | ​ | 36,029 | ​
Non-borrower: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Performance standby | ​ | ​ | - | ​ | ​ | 67 | ​ | ​ | 67 | ​ | ​ | - | ​ | ​ | 67 | ​ | ​ | 67 | ​
Total letters of credit | ​ | $ | 3,629 | ​ | $ | 28,948 | ​ | $ | 32,577 | ​ | $ | 6,675 | ​ | $ | 29,421 | ​ | $ | 36,096 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unused loan commitments: | ​ | $ | 139,654 | ​ | $ | 765,693 | ​ | $ | 905,347 | ​ | $ | 139,070 | ​ | $ | 860,255 | ​ | $ | 999,325 | ​

X
- Definition Tabular disclosure of the entity's contractual commitments due to letters of credit commitments that relate to properties held in other real estate owned. + References No definition available. + Details
Name: | osbc_ScheduleOfContractualCommitmentsDueToLettersOfCreditTableTextBlock
Namespace Prefix: | osbc_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B + Details
Name: | us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration