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Regulatory Restrictions - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Compliance With Regulatory Capital Requirements Under Banking Regulations [Abstract] |  |
Cash and due from banks held as collateral | $ 0.0 | $ 14.6
Dividend approval threshold, years | 2 years |

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- Definition Cash and due from banks held as collateral for collateralized swap positions. + References No definition available. + Details
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- Definition Compliance With Regulatory Capital Requirements Under Banking Regulations + References No definition available. + Details
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- Definition Time period preceding current year that is considered when paying dividends. + References No definition available. + Details
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Namespace Prefix: | onb_
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Balance Type: | na
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