XML 144 R130.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Regulatory Restrictions - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Compliance With Regulatory Capital Requirements Under Banking Regulations [Abstract] |  |  |
Cash and due from banks held as collateral | $ 0.3 | $ 0.1 |
Dividend approval threshold, years | 2 years | 2 years | 2 years
Dividend payments without regulatory approval | $ 670.4 |  |

X
- Definition Cash and due from banks held as collateral for collateralized swap positions. + References No definition available. + Details
Name: | onb_CashAndDueFromBanksHeldAsCollateralForCollateralizedSwapPositions
Namespace Prefix: | onb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Compliance With Regulatory Capital Requirements Under Banking Regulations + References No definition available. + Details
Name: | onb_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsAbstract
Namespace Prefix: | onb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Time period preceding current year that is considered when paying dividends. + References No definition available. + Details
Name: | onb_DividendApprovalThreshold
Namespace Prefix: | onb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References No definition available. + Details
Name: | us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant