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v3.22.1

Commitments and Contingencies (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items] |  |
Loan commitments | $ 7,991,000,000 | $ 4,489,000,000
Standby letters of credit | $ 221,100,000 | 75,700,000
Fixed rate loan commitment, percent | 10.00% |
Loan commitments floating rate, minimum | 0.174% |
Loan commitments floating rate, maximum | 21.00% |
Allowance for unfunded loan commitments | $ 22,000,000 | 10,900,000
Extended credit | 6,700,000 | 21,800,000
Credit extensions with collateral | $ 6,500,000 | $ 6,500,000
Class B Restricted Shares | Visa |  |
Loss Contingencies [Line Items] |  |
Restricted stock conversion ratio | 1.6181 |
Investment owned, balance, shares | shares | 65,466 |
Investment owned, at cost | $ 0 |

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- Definition Amount of valuation allowance recorded for unfunded commitments to extend credit. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of credit extended with unaffiliated banks related to letter of credit commitments issued on behalf of our clients. + References No definition available. + Details
Name: | onb_CreditExtended
Namespace Prefix: | onb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of collateral provided to secure credit extended with unaffiliated banks related to letter of credit commitments issued on behalf of our clients. + References No definition available. + Details
Name: | onb_CreditExtensionsWithCollateral
Namespace Prefix: | onb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of agreement to extend credit in the form of a loan. + References No definition available. + Details
Name: | onb_LoanCommitments
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Balance Type: | credit
Period Type: | instant

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- Definition Maximum floating rate percentage charged on loan commitments. + References No definition available. + Details
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- Definition Minimum floating rate percentage charged on loan commitments. + References No definition available. + Details
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- Definition Loans and Leases Receivable, Commitments, Fixed Rates, Percent + References No definition available. + Details
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- Definition Amount of agreement to extend credit in the form of a standby letter of credit. + References No definition available. + Details
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Namespace Prefix: | onb_
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Balance Type: | credit
Period Type: | instant

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- Definition Restricted stock conversion ratio. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Balance held at close of period in number of shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column B)) -URI http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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- Details
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