$OSBC
Old Second Bancorp Inc Stock $osbc

$osbc Overview Financials Valuation SEC Filings Company Website

2024 Q2 Form 10-Q Financial Statement

#000035717324000035 Filed on May 09, 2024

Income Statement

Concept	2024 Q2	2024 Q1
Revenue	$73.22M	$73.33M
YoY Change	-0.9%	4.52%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$2.184M	$2.255M
YoY Change	69.3%	27.11%
% of Gross Profit
Depreciation & Amortization	$1.945M	$1.350M
YoY Change	13.94%	29.06%
% of Gross Profit
Operating Expenses	$2.184M	$2.255M
YoY Change	69.3%	27.11%
Operating Profit
YoY Change
Interest Expense	$13.53M	$13.55M
YoY Change	31.31%	123.07%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$29.19M	$28.54M
YoY Change	-16.54%	-10.84%
Income Tax	$7.299M	$7.231M
% Of Pretax Income	25.01%	25.33%
Net Earnings	$21.89M	$21.31M
YoY Change	-14.36%	-9.72%
Net Earnings / Revenue	29.9%	29.06%
Basic Earnings Per Share	$0.48	$0.48
Diluted Earnings Per Share	$0.48	$0.47
COMMON SHARES
Basic Shares Outstanding	44.85M	44.80M
Diluted Shares Outstanding	45.68M	45.52M

Balance Sheet

Concept	2024 Q2	2024 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$120.9M	$98.09M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$82.87M	$81.29M
YoY Change	13.84%	12.05%
Goodwill	$86.48M	$86.48M
YoY Change	0.0%	0.0%
Intangibles	$10.06M	$10.64M
YoY Change	-19.08%	-18.52%
Long-Term Investments
YoY Change
Other Assets	$28.71M	$31.70M
YoY Change	-27.91%	-16.24%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$5.663B	$5.616B
YoY Change	-3.76%	-5.14%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$46.54M	$253.5M
YoY Change	-90.99%	-26.06%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$46.54M	$253.5M
YoY Change	-90.99%	-26.06%
LONG-TERM LIABILITIES
Long-Term Debt	$85.20M	$85.18M
YoY Change	0.1%	-34.33%
Other Long-Term Liabilities	$59.90M	$72.92M
YoY Change	18.0%	36.05%
Total Long-Term Liabilities	$145.1M	$158.1M
YoY Change	6.79%	-13.75%
TOTAL LIABILITIES
Total Short-Term Liabilities	$46.54M	$253.5M
Total Long-Term Liabilities	$145.1M	$158.1M
Total Liabilities	$5.043B	$5.020B
YoY Change	-6.08%	-7.44%
SHAREHOLDERS EQUITY
Retained Earnings	$432.0M	$412.4M
YoY Change	21.63%	24.25%
Common Stock	$44.91M	$44.91M
YoY Change	0.45%	0.45%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$619.3M	$596.2M
YoY Change
Total Liabilities & Shareholders Equity	$5.663B	$5.616B
YoY Change	-3.76%	-5.14%

Cashflow Statement

Concept	2024 Q2	2024 Q1
OPERATING ACTIVITIES
Net Income	$21.89M	$21.31M
YoY Change	-14.36%	-9.72%
Depreciation, Depletion And Amortization	$1.945M	$1.350M
YoY Change	13.94%	29.06%
Cash From Operating Activities	$11.75M	$47.29M
YoY Change	-139.9%	35.1%
INVESTING ACTIVITIES
Capital Expenditures	$2.963M	$3.330M
YoY Change	99.26%	113.46%
Acquisitions
YoY Change
Other Investing Activities	-$20.11M	$97.22M
YoY Change	-121.52%	-335.05%
Cash From Investing Activities	-$23.07M	$93.89M
YoY Change	-125.09%	-318.75%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	34.12M	-143.2M
YoY Change	-164.49%	3280.48%
NET CHANGE
Cash From Operating Activities	11.75M	47.29M
Cash From Investing Activities	-23.07M	93.89M
Cash From Financing Activities	34.12M	-143.2M
Net Change In Cash	22.80M	-2.051M
YoY Change	137.78%	-83.13%
FREE CASH FLOW
Cash From Operating Activities	$11.75M	$47.29M
Capital Expenditures	$2.963M	$3.330M
Free Cash Flow	$8.785M	$43.96M
YoY Change	-128.4%	31.44%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2024Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000357173
CY2024Q1	dei	Entity Registrant Name EntityRegistrantName	OLD SECOND BANCORP INC
CY2024Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2024Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
CY2024Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2024Q1	dei	Amendment Flag AmendmentFlag	false
CY2024Q1	dei	Document Type DocumentType	10-Q
CY2024Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2024Q1	dei	Document Period End Date DocumentPeriodEndDate	2024-03-31
CY2024Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2024Q1	dei	Entity File Number EntityFileNumber	000-10537
CY2024Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2024Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	36-3143493
CY2024Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	37 South River Street
CY2024Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Aurora
CY2024Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	IL
CY2024Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	60507
CY2024Q1	dei	City Area Code CityAreaCode	630
CY2024Q1	dei	Local Phone Number LocalPhoneNumber	892-0202
CY2024Q1	dei	Security12b Title Security12bTitle	Common Stock
CY2024Q1	dei	Trading Symbol TradingSymbol	OSBC
CY2024Q1	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2024Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2024Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2024Q1	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2024Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2024Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2024Q1	dei	Entity Shell Company EntityShellCompany	false
CY2024Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	44845629
CY2024Q1	us-gaap	Cash And Due From Banks CashAndDueFromBanks	48841000
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	55534000
CY2024Q1	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	49253000
CY2023Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	44611000
CY2024Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	98094000
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	100145000
CY2024Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1168797000
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1192829000
CY2024Q1	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	28518000
CY2023Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	33355000
CY2024Q1	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	1072000
CY2023Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	1322000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	3969411000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	4042953000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	44113000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	44264000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAfterAllowanceForCreditLoss	3925298000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAfterAllowanceForCreditLoss	3998689000
CY2024Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	81290000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	79310000
CY2024Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	5123000
CY2023Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	5123000
CY2024Q1	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	10564000
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	10344000
CY2024Q1	us-gaap	Goodwill Goodwill	86478000
CY2023Q4	us-gaap	Goodwill Goodwill	86478000
CY2024Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10637000
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	11217000
CY2024Q1	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	110490000
CY2023Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	109318000
CY2024Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	31699000
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	31077000
CY2024Q1	us-gaap	Other Assets OtherAssets	58012000
CY2023Q4	us-gaap	Other Assets OtherAssets	63592000
CY2024Q1	us-gaap	Assets Assets	5616072000
CY2023Q4	us-gaap	Assets Assets	5722799000
CY2024Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1799927000
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1834891000
CY2024Q1	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2221696000
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2207949000
CY2024Q1	us-gaap	Time Deposits TimeDeposits	586652000
CY2023Q4	us-gaap	Time Deposits TimeDeposits	527906000
CY2024Q1	us-gaap	Deposits Deposits	4608275000
CY2023Q4	us-gaap	Deposits Deposits	4570746000
CY2024Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	33546000
CY2023Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	26470000
CY2024Q1	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	220000000
CY2023Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	405000000
CY2024Q1	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	25773000
CY2023Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	25773000
CY2024Q1	us-gaap	Subordinated Debt SubordinatedDebt	59403000
CY2023Q4	us-gaap	Subordinated Debt SubordinatedDebt	59382000
CY2024Q1	us-gaap	Other Liabilities OtherLiabilities	72916000
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	58147000
CY2024Q1	us-gaap	Liabilities Liabilities	5019913000
CY2023Q4	us-gaap	Liabilities Liabilities	5145518000
CY2024Q1	us-gaap	Common Stock Value CommonStockValue	44908000
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	44705000
CY2024Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	203129000
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	202223000
CY2024Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	412388000
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	393311000
CY2024Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-63361000
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-62781000
CY2024Q1	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	905000
CY2023Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	177000
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	596159000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	577281000
CY2024Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5616072000
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5722799000
CY2024Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2024Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000
CY2024Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	44907619
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	44705150
CY2024Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	44845629
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	44697917
CY2024Q1	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	61990
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	7233
CY2024Q1	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	62673000
CY2023Q1	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	57210000
CY2024Q1	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	14000
CY2023Q1	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	12000
CY2024Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	8092000
CY2023Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	10735000
CY2024Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	1306000
CY2023Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	1337000
CY2024Q1	us-gaap	Dividend Income Operating DividendIncomeOperating	635000
CY2023Q1	us-gaap	Dividend Income Operating DividendIncomeOperating	280000
CY2024Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	610000
CY2023Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	585000
CY2024Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	73330000
CY2023Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	70159000
CY2024Q1	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	4037000
CY2023Q1	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	1149000
CY2024Q1	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	4041000
CY2023Q1	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	664000
CY2024Q1	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	86000
CY2023Q1	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	9000
CY2024Q1	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	4557000
CY2023Q1	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	2345000
CY2024Q1	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	280000
CY2023Q1	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	279000
CY2024Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	546000
CY2023Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	546000
CY2023Q1	osbc	Interest Expense Senor Notes InterestExpenseSenorNotes	994000
CY2023Q1	osbc	Interest Expense Notes Payable And Other Borrowings InterestExpenseNotesPayableAndOtherBorrowings	87000
CY2024Q1	us-gaap	Interest Expense InterestExpense	13547000
CY2023Q1	us-gaap	Interest Expense InterestExpense	6073000
CY2024Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	59783000
CY2023Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	64086000
CY2024Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3500000
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3501000
CY2024Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	56283000
CY2023Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	60585000
CY2024Q1	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-94000
CY2023Q1	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	525000
CY2024Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	314000
CY2023Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	306000
CY2024Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1000
CY2023Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-1675000
CY2024Q1	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1172000
CY2023Q1	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	242000
CY2024Q1	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	2376000
CY2023Q1	osbc	Card Interchange Income Debit CardInterchangeIncomeDebit	2244000
CY2024Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1030000
CY2023Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1489000
CY2024Q1	us-gaap	Noninterest Income NoninterestIncome	10501000
CY2023Q1	us-gaap	Noninterest Income NoninterestIncome	7350000
CY2024Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	24312000
CY2023Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	22248000
CY2024Q1	us-gaap	Equipment Expense EquipmentExpense	3927000
CY2023Q1	us-gaap	Equipment Expense EquipmentExpense	3475000
CY2024Q1	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	2255000
CY2023Q1	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	1774000
CY2024Q1	osbc	Federal Deposit Insurance Corporation Premium Expense Including Adjustments FederalDepositInsuranceCorporationPremiumExpenseIncludingAdjustments	667000
CY2023Q1	osbc	Federal Deposit Insurance Corporation Premium Expense Including Adjustments FederalDepositInsuranceCorporationPremiumExpenseIncludingAdjustments	584000
CY2024Q1	osbc	Net Teller And Bill Paying Expense NetTellerAndBillPayingExpense	521000
CY2023Q1	osbc	Net Teller And Bill Paying Expense NetTellerAndBillPayingExpense	502000
CY2024Q1	us-gaap	General Insurance Expense GeneralInsuranceExpense	309000
CY2023Q1	us-gaap	General Insurance Expense GeneralInsuranceExpense	305000
CY2024Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	580000
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	624000
CY2024Q1	us-gaap	Advertising Expense AdvertisingExpense	192000
CY2023Q1	us-gaap	Advertising Expense AdvertisingExpense	142000
CY2024Q1	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1277000
CY2023Q1	osbc	Debit Card Interchange Expense DebitCardInterchangeExpense	1216000
CY2024Q1	us-gaap	Legal Fees LegalFees	226000
CY2023Q1	us-gaap	Legal Fees LegalFees	319000
CY2024Q1	osbc	Consulting And Management Fee Expense ConsultingAndManagementFeeExpense	336000
CY2023Q1	osbc	Consulting And Management Fee Expense ConsultingAndManagementFeeExpense	790000
CY2024Q1	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	46000
CY2023Q1	osbc	Other Real Estate Owned Expense OtherRealEstateOwnedExpense	306000
CY2024Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3593000
CY2023Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3637000
CY2024Q1	us-gaap	Noninterest Expense NoninterestExpense	38241000
CY2023Q1	us-gaap	Noninterest Expense NoninterestExpense	35922000
CY2024Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	28543000
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	32013000
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7231000
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8406000
CY2024Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	21312000
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	23607000
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2024Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.05
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.05
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	21312000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	23607000
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-876000
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	16210000
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-245000
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	4536000
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-631000
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	11674000
CY2024Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-1675000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-471000
CY2024Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-1204000
CY2024Q1	osbc	Other Comprehensive Income Available For Sale Securities Unrealized Holding Gain Loss Net Reclassification Adjustment For Amounts Realized After Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	-632000
CY2023Q1	osbc	Other Comprehensive Income Available For Sale Securities Unrealized Holding Gain Loss Net Reclassification Adjustment For Amounts Realized After Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	12878000
CY2024Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	52000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	1602000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	456000
CY2024Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	52000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	1146000
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-580000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	14024000
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	20732000
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	37631000
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	21312000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	23607000
CY2024Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-821000
CY2023Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-799000
CY2024Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1000
CY2023Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-1675000
CY2024Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3500000
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3501000
CY2024Q1	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	9103000
CY2023Q1	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	10206000
CY2024Q1	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	9536000
CY2023Q1	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	9957000
CY2024Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	314000
CY2023Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	306000
CY2024Q1	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-94000
CY2023Q1	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	525000
CY2024Q1	osbc	Net Discount Accretion Of Purchase Accounting Adjustment On Loans NetDiscountAccretionOfPurchaseAccountingAdjustmentOnLoans	157000
CY2023Q1	osbc	Net Discount Accretion Of Purchase Accounting Adjustment On Loans NetDiscountAccretionOfPurchaseAccountingAdjustmentOnLoans	1180000
CY2024Q1	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1172000
CY2023Q1	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	242000
CY2023Q1	osbc	Gains Losses On Sales Of Other Real Estate Before Provision For Valuation Allowance GainsLossesOnSalesOfOtherRealEstateBeforeProvisionForValuationAllowance	-28000
CY2023Q1	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	269000
CY2024Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1350000
CY2023Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1046000
CY2023Q1	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	434000
CY2024Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	580000
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	624000
CY2024Q1	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	4825000
CY2023Q1	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	7043000
CY2024Q1	osbc	Deferred Income Tax Expense Benefit After Deferred Tax Asset Valuation Adjustment DeferredIncomeTaxExpenseBenefitAfterDeferredTaxAssetValuationAdjustment	-375000
CY2023Q1	osbc	Deferred Income Tax Expense Benefit After Deferred Tax Asset Valuation Adjustment DeferredIncomeTaxExpenseBenefitAfterDeferredTaxAssetValuationAdjustment	1442000
CY2024Q1	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	-1543000
CY2023Q1	osbc	Increase Decrease In Accrued Interest Receivable And Other Assets IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets	-2635000
CY2024Q1	osbc	Net Premium Amortization Discount Accretion Of Purchase Accounting Adjustments On Loans NetPremiumAmortizationDiscountAccretionOfPurchaseAccountingAdjustmentsOnLoans	-78000
CY2023Q1	osbc	Net Premium Amortization Discount Accretion Of Purchase Accounting Adjustments On Loans NetPremiumAmortizationDiscountAccretionOfPurchaseAccountingAdjustmentsOnLoans	-367000
CY2024Q1	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	14059000
CY2023Q1	osbc	Increase Decrease In Accrued Interest Payable And Other Liabilities IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities	-6344000
CY2024Q1	us-gaap	Share Based Compensation ShareBasedCompensation	1058000
CY2023Q1	us-gaap	Share Based Compensation ShareBasedCompensation	932000
CY2024Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	47290000
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	35004000
CY2024Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	32665000
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	37718000
CY2024Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	5331000
CY2023Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	66170000
CY2024Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	15661000
CY2023Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	4186000
CY2024Q1	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-4837000
CY2023Q1	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	9675000
CY2024Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-70048000
CY2023Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	132445000
CY2023Q1	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	300000
CY2023Q1	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	756000
CY2024Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3330000
CY2023Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1560000
CY2024Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	93890000
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-42922000
CY2024Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	37607000
CY2023Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-213136000
CY2024Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	7076000
CY2023Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-4259000
CY2024Q1	osbc	Proceeds From Repayments Of Other Short Term Borrowings ProceedsFromRepaymentsOfOtherShortTermBorrowings	-185000000
CY2023Q1	osbc	Proceeds From Repayments Of Other Short Term Borrowings ProceedsFromRepaymentsOfOtherShortTermBorrowings	225000000
CY2023Q1	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	9000000
CY2024Q1	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	99000
CY2024Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	2237000
CY2023Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	2237000
CY2024Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	776000
CY2023Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	605000
CY2024Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-143231000
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-4237000
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-2051000
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-12155000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	100145000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	115177000
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	98094000
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	103022000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	461141000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	23607000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	14024000
CY2023Q1	osbc	Dividends Declared And Paid Per Share DividendsDeclaredAndPaidPerShare	0.05
CY2023Q1	us-gaap	Dividends Common Stock DividendsCommonStock	2229000
CY2023Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	932000
CY2023Q1	osbc	Treasury Stock Purchase From Taxes Withheld On Stock Awards TreasuryStockPurchaseFromTaxesWithheldOnStockAwards	605000
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	496870000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	577281000
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	21312000
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-580000
CY2024Q1	osbc	Dividends Declared And Paid Per Share DividendsDeclaredAndPaidPerShare	0.05
CY2024Q1	us-gaap	Dividends Common Stock DividendsCommonStock	2235000
CY2024Q1	osbc	Change In Restricted Stock ChangeInRestrictedStock	-99000
CY2024Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1058000
CY2024Q1	osbc	Treasury Stock Purchase From Taxes Withheld On Stock Awards TreasuryStockPurchaseFromTaxesWithheldOnStockAwards	776000
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	596159000
CY2023Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.05
CY2023Q4	us-gaap	Payments Of Dividends PaymentsOfDividends	2200000
CY2024Q1	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	13600000
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	18500000
CY2024Q1	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	14900000
CY2023Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	14900000
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1253826000
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1043000
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	86072000
CY2024Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1168797000
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1276981000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1818000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	85970000
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1192829000
CY2024Q1	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	6300000
CY2023Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	6600000
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	197825000
CY2024Q1	osbc	Available For Sale Securities Debt Maturities Within One Year Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCostWeightedAverageYield	0.0105
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	193861000
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	53675000
CY2024Q1	osbc	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostWeightedAverageYield	0.0192
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	50940000
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	56283000
CY2024Q1	osbc	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostWeightedAverageYield	0.0277
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	51681000
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	160101000
CY2024Q1	osbc	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostWeightedAverageYield	0.0311
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	154239000
CY2024Q1	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Amortized Cost Basis AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis	467884000
CY2024Q1	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Weighted Average Yield AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateWeightedAverageYield	0.0206
CY2024Q1	osbc	Available For Sale Debt Maturities Before Securities Without Single Maturity Date Fair Value AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue	450721000
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1253826000
CY2024Q1	osbc	Available For Sale Securities Weighted Average Yield AvailableForSaleSecuritiesWeightedAverageYield	0.0299
CY2024Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1168797000
CY2024Q1	osbc	Number Of Securities Issued From Originators NumberOfSecuritiesIssuedFromOriginators	0
CY2024Q1	osbc	Number Of Originators That Company Has Invested Over Specified Percentage Of Its Stockholders Equity NumberOfOriginatorsThatCompanyHasInvestedOverSpecifiedPercentageOfItsStockholdersEquity	1
CY2024Q1	osbc	Minimum Percentage Of Securities Investment From Originators MinimumPercentageOfSecuritiesInvestmentFromOriginators	0.10
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2024Q1	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	22
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	306000
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	73523000
CY2024Q1	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	353
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	85766000
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	980206000
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	375
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	86072000
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1053729000
CY2023Q4	osbc	Available For Sale Securities In Unrealized Loss Position Less Than12 Months Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionLessThan12MonthsQualitativeDisclosureNumberOfPositions	14
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	145000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	28708000
CY2023Q4	osbc	Available For Sale Securities In Unrealized Loss Positions12 Months Or Longer Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositions12MonthsOrLongerQualitativeDisclosureNumberOfPositions	353
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	85825000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	1030120000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	367
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	85970000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1058828000
CY2024Q1	osbc	Investment Portfolio Effective Duration InvestmentPortfolioEffectiveDuration	P3Y
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2024Q1	us-gaap	Debt Securities Available For Sale Change In Present Value Interest Income DebtSecuritiesAvailableForSaleChangeInPresentValueInterestIncome	0
CY2024Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	5331000
CY2023Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	66170000
CY2024Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1000
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	1675000
CY2024Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	1000
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-1675000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-471000
CY2024Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.000
CY2023Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.281
CY2024Q1	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	804900000
CY2023Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	810200000
CY2023Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	810200000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	3969411000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	4042953000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	44113000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	44264000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAfterAllowanceForCreditLoss	3925298000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAfterAllowanceForCreditLoss	3998689000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAccruedInterest	19400000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAccruedInterest	20500000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	44264000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestCreditLossExpenseReversal	3544000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossWriteoff	3988000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossRecovery	293000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	44113000
CY2022Q4	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	49480000
CY2023Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestCreditLossExpenseReversal	4652000
CY2023Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossWriteoff	1022000
CY2023Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossRecovery	282000
CY2024Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	5123000
CY2023Q1	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	53392000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest	44100000
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	3500000
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	500000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	3969411000
CY2024Q1	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	789000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	4042953000
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1196000
CY2024Q1	osbc	Financing Receivable Nonaccrual Including Purchased Credit Impaired Loans FinancingReceivableNonaccrualIncludingPurchasedCreditImpairedLoans	64324000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Nonaccrual No Allowance FinancingReceivableAndNetInvestmentInLeaseNonaccrualNoAllowance	32784000
CY2023Q4	osbc	Financing Receivable Nonaccrual Including Purchased Credit Impaired Loans FinancingReceivableNonaccrualIncludingPurchasedCreditImpairedLoans	67583000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Nonaccrual No Allowance FinancingReceivableAndNetInvestmentInLeaseNonaccrualNoAllowance	33099000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Nonaccrual Interest Income FinancingReceivableAndNetInvestmentInLeaseNonaccrualInterestIncome	34000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	142395000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Two Originated Fiscal Year Before Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeFiscalYear	1021561000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Three Originated Two Years Before Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeFiscalYear	981411000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Four Originated Three Years Before Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeFiscalYear	653768000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Five Originated Four Years Before Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeFiscalYear	309804000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	446658000
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	413814000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	3969411000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	965644000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Two Originated Fiscal Year Before Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeFiscalYear	997009000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Three Originated Two Years Before Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeFiscalYear	737065000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Four Originated Three Years Before Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeFiscalYear	367981000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Five Originated Four Years Before Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeFiscalYear	192786000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	306846000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	474214000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan	1408000
CY2023Q4	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	4042953000
CY2023Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1255000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	3853000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	16000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	119000
CY2024Q1	osbc	Financing Receivable And Net Investment In Lease Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossWriteoff	3988000
CY2024Q1	osbc	Financing Receivable Modified In Period Number Of Contracts FinancingReceivableModifiedInPeriodNumberOfContracts	6
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Accumulated FinancingReceivableExcludingAccruedInterestModifiedAccumulated	18600000
CY2023Q1	osbc	Financing Receivable Modified In Period Number Of Contracts FinancingReceivableModifiedInPeriodNumberOfContracts	3
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Accumulated FinancingReceivableExcludingAccruedInterestModifiedAccumulated	2800000
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Subsequent Default FinancingReceivableExcludingAccruedInterestModifiedSubsequentDefault	0
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Subsequent Default FinancingReceivableExcludingAccruedInterestModifiedSubsequentDefault	0
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Accumulated FinancingReceivableExcludingAccruedInterestModifiedAccumulated	18612000
CY2024Q1	osbc	Financing Receivable Modified In Period To Total Financing Receivables Percentage FinancingReceivableModifiedInPeriodToTotalFinancingReceivablesPercentage	0.005
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Accumulated FinancingReceivableExcludingAccruedInterestModifiedAccumulated	2773000
CY2023Q1	osbc	Financing Receivable Modified In Period To Total Financing Receivables Percentage FinancingReceivableModifiedInPeriodToTotalFinancingReceivablesPercentage	0.001
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Accumulated FinancingReceivableExcludingAccruedInterestModifiedAccumulated	18612000
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Accumulated FinancingReceivableExcludingAccruedInterestModifiedAccumulated	2773000
CY2024Q1	osbc	Financing Receivable Modified In Period Number Of Contracts FinancingReceivableModifiedInPeriodNumberOfContracts	2
CY2024Q1	us-gaap	Financing Receivable Modified Weighted Average Term Increase From Modification FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	P7M6D
CY2024Q1	us-gaap	Financing Receivable Modified Weighted Average Interest Rate Decrease From Modification FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification	0.0015
CY2023Q1	us-gaap	Financing Receivable Modified Weighted Average Term Increase From Modification FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	P6M21D
CY2023Q1	us-gaap	Financing Receivable Modified Weighted Average Interest Rate Decrease From Modification FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification	0.0500
CY2023Q1	osbc	Financing Receivable Modified Weighted Average Payment Delay From Modification FinancingReceivableModifiedWeightedAveragePaymentDelayFromModification	P7M
CY2023Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	5123000
CY2022Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1561000
CY2023Q1	osbc	Real Estate Acquisitions Through Foreclosures Net Of Acquisition Adjustments RealEstateAcquisitionsThroughForeclosuresNetOfAcquisitionAdjustments	291000
CY2023Q1	osbc	Real Estate Cost Of Real Estate Sold Net Of Gain Loss RealEstateCostOfRealEstateSoldNetOfGainLoss	328000
CY2023Q1	osbc	Real Estate Owned Valuation Allowance Provision Net Of Adjustment RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment	269000
CY2023Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	118000
CY2022Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	856000
CY2023Q1	osbc	Real Estate Owned Valuation Allowance Provision Benefit RealEstateOwnedValuationAllowanceProvisionBenefit	269000
CY2023Q1	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	272000
CY2024Q1	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	118000
CY2023Q1	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	853000
CY2023Q1	osbc	Gains Losses On Sales Of Other Real Estate Before Provision For Valuation Allowance GainsLossesOnSalesOfOtherRealEstateBeforeProvisionForValuationAllowance	-28000
CY2023Q1	osbc	Real Estate Owned Valuation Allowance Provision Benefit RealEstateOwnedValuationAllowanceProvisionBenefit	269000
CY2024Q1	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	113000
CY2023Q1	osbc	Real Estate Acquired Through Foreclosure Operating Expenses RealEstateAcquiredThroughForeclosureOperatingExpenses	9000
CY2024Q1	osbc	Lease Revenue For Other Real Estate LeaseRevenueForOtherRealEstate	67000
CY2024Q1	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	46000
CY2023Q1	osbc	Foreclosed Real Estate Expense Net Of Lease Revenue ForeclosedRealEstateExpenseNetOfLeaseRevenue	306000
CY2024Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1799927000
CY2024Q1	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	955528000
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	971334000
CY2024Q1	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	569814000
CY2023Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	565375000
CY2024Q1	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	696354000
CY2023Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	671240000
CY2024Q1	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	289962000
CY2023Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	266035000
CY2024Q1	osbc	Time Deposits100000 To250000 TimeDeposits100000To250000	205638000
CY2023Q4	osbc	Time Deposits100000 To250000 TimeDeposits100000To250000	180289000
CY2024Q1	osbc	Time Deposits250000 Or More TimeDeposits250000OrMore	91052000
CY2023Q4	osbc	Time Deposits250000 Or More TimeDeposits250000OrMore	81582000
CY2024Q1	us-gaap	Deposits Deposits	4608275000
CY2023Q4	us-gaap	Deposits Deposits	4570746000
CY2024Q1	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	338722000
CY2023Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	516625000
CY2024Q1	osbc	Number Of Customers Having Secured Balances Exceeding Specified Percentage Of Stockholders Equity NumberOfCustomersHavingSecuredBalancesExceedingSpecifiedPercentageOfStockholdersEquity	0
CY2024Q1	osbc	Threshold For Disclosure Percentage Of Stockholders Equity ThresholdForDisclosurePercentageOfStockholdersEquity	0.10
CY2024Q1	osbc	Federal Home Loan Bank Advances As Percentage Of Total Assets FederalHomeLoanBankAdvancesAsPercentageOfTotalAssets	0.35
CY2024Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	59400000
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	59400000
CY2020Q1	us-gaap	Debt Instrument Basis Spread On Variable Rate1 DebtInstrumentBasisSpreadOnVariableRate1	0.0175
CY2020Q1	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	30000000.0
CY2024Q1	osbc	Condition Performance Measure Fully Earned Vesting Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Rights Percentage ConditionPerformanceMeasureFullyEarnedVestingShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentage	0.50
CY2024Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1200000
CY2023Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	948000000000
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44758559
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44619118
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	21312000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	23607000
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44758559
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44619118
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45523884
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45316598
CY2024Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	21312000
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	23607000
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2024Q1	osbc	Tier One Risk Based Capital Common Equity TierOneRiskBasedCapitalCommonEquity	566730000
CY2024Q1	osbc	Tier One Risk Based Capital Common Equity To Risk Weighted Assets TierOneRiskBasedCapitalCommonEquityToRiskWeightedAssets	0.001202
CY2024Q1	osbc	Tier One Risk Based Common Capital Required For Capital Adequacy TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacy	330042000
CY2024Q1	osbc	Tier One Risk Based Common Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0700
CY2024Q1	us-gaap	Capital Capital	697211000
CY2024Q1	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1479
CY2024Q1	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	494977000
CY2024Q1	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.1050
CY2024Q1	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	591730000
CY2024Q1	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1255
CY2024Q1	osbc	Tier One Risk Based Capital Required For Capital Adequacy With Buffer TierOneRiskBasedCapitalRequiredForCapitalAdequacyWithBuffer	400773000
CY2024Q1	osbc	Tier One Risk Based Capital Required For Capital Adequacy With Buffer To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyWithBufferToRiskWeightedAssets	0.0850
CY2024Q1	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	591730000
CY2024Q1	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1047
CY2024Q1	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	226067000
CY2024Q1	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2023Q4	osbc	Tier One Risk Based Capital Common Equity TierOneRiskBasedCapitalCommonEquity	547721000
CY2023Q4	osbc	Tier One Risk Based Capital Common Equity To Risk Weighted Assets TierOneRiskBasedCapitalCommonEquityToRiskWeightedAssets	0.001137
CY2023Q4	osbc	Tier One Risk Based Common Capital Required For Capital Adequacy TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacy	337207000
CY2023Q4	osbc	Tier One Risk Based Common Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.000700
CY2023Q4	us-gaap	Capital Capital	677076000
CY2023Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1406
CY2023Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	505640000
CY2023Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.1050
CY2023Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	572721000
CY2023Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1189
CY2023Q4	osbc	Tier One Risk Based Capital Required For Capital Adequacy With Buffer TierOneRiskBasedCapitalRequiredForCapitalAdequacyWithBuffer	409430000
CY2023Q4	osbc	Tier One Risk Based Capital Required For Capital Adequacy With Buffer To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyWithBufferToRiskWeightedAssets	0.0850
CY2023Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	572721000
CY2023Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1006
CY2023Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	227722000
CY2023Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2024Q1	osbc	Deferment Of Cumulative Effect Of Impact On Retained Earnings Due To Adoption Of New Accounting Standard DefermentOfCumulativeEffectOfImpactOnRetainedEarningsDueToAdoptionOfNewAccountingStandard	951000000000
CY2024Q1	osbc	Dividend Restrictions Number Of Previous Years Retained Profit DividendRestrictionsNumberOfPreviousYearsRetainedProfit	P2Y
CY2024Q1	us-gaap	Amount Available For Dividend Distribution Without Affecting Capital Adequacy Requirements AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements	93700000
CY2024Q1	osbc	Tier One Common Equity Capital Distribution Limitation Minimum Regulatory Capital Percentage Next Twelve Months TierOneCommonEquityCapitalDistributionLimitationMinimumRegulatoryCapitalPercentageNextTwelveMonths	0.0250
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	0
CY2024Q1	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	2100000
CY2023Q1	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	3100000
CY2024Q1	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	1600000
CY2023Q1	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	1000000.0
CY2024Q1	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	30478000
CY2023Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	31112000
CY2024Q1	osbc	Allowance For Credit Loss On Unfunded Commitments AllowanceForCreditLossOnUnfundedCommitments	2700000
CY2024Q1	osbc	Increase Decrease In Allowance For Credit Loss On Unfunded Commitments IncreaseDecreaseInAllowanceForCreditLossOnUnfundedCommitments	44000
CY2024Q1	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2024Q1	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q1	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2024Q1	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

Files In Submission

Name	View Source	Status
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0000357173-24-000035-index.html	Edgar Link	pending
0000357173-24-000035.txt	Edgar Link	pending
0000357173-24-000035-xbrl.zip	Edgar Link	pending
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report.css	Edgar Link	pending
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tmb-20240331.xsd	Edgar Link	pending
tmb-20240331x10q.htm	Edgar Link	pending
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tmb-20240331_pre.xml	Edgar Link	unprocessable
tmb-20240331x10q_htm.xml	Edgar Link	completed
FilingSummary.xml	Edgar Link	unprocessable
tmb-20240331_cal.xml	Edgar Link	unprocessable

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$OSBC
Old Second Bancorp Inc Stock $osbc

2024 Q2 Form 10-Q Financial Statement

#000035717324000035 Filed on May 09, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC Old Second Bancorp Inc Stock $osbc

2024 Q2 Form 10-Q Financial Statement

#000035717324000035 Filed on May 09, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OSBC
Old Second Bancorp Inc Stock $osbc