XML 118 R103.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Federal Home Loan Bank Advances - Additional Information (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) advance | Dec. 31, 2020 USD ($) advance | Dec. 30, 2021 | Dec. 30, 2020
Federal Home Loan Bank, Advances [Line Items] |  |  |  |
Weighted-average rates of FHLB advances | 1.30% | 1.32% |  |
Modifications, amount | $ 50.0 | $ 500.0 |  |
Modifications, number of contracts | advance | 2 | 4 |  |
Weighted average interest rate | 0.33% | 1.28% | 1.53% | 2.00%
Modifications, unamortized prepayment fees | $ 26.2 | $ 30.0 |  |
FHLB Advances |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |
Percentage of borrowings collateralized by investment securities and residential real estate loans | 140.00% |  |  |

X
- Definition Advances From Federal Home Loan Banks, Modifications, Amount + References No definition available. + Details
Name: | onb_AdvancesFromFederalHomeLoanBanksModificationsAmount
Namespace Prefix: | onb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Advances From Federal Home Loan Banks, Modifications, Number Of Contracts + References No definition available. + Details
Name: | onb_AdvancesFromFederalHomeLoanBanksModificationsNumberOfContracts
Namespace Prefix: | onb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Advances From Federal Home Loan Banks, Modifications, Unamortized Prepayment Fees + References No definition available. + Details
Name: | onb_AdvancesFromFederalHomeLoanBanksModificationsUnamortizedPrepaymentFees
Namespace Prefix: | onb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of collateral pledged as a percentage of outstanding secured debt. + References No definition available. + Details
Name: | onb_PercentageOfBorrowingsCollateralizedByInvestmentSecuritiesAndResidentialRealEstateLoans
Namespace Prefix: | onb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank). + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_FederalHomeLoanBankAdvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |