XML 112 R90.htm IDEA: XBRL DOCUMENT
v3.22.1

Other Borrowings - Summary of Terms of Outstanding Junior Subordinated Debentures (Details) - Trust Preferred Securities - Junior Subordinated Debentures | 3 Months Ended
--- | ---
Mar. 31, 2022 USD ($)
Debt Instrument [Line Items] |
Issuance Amount | $ 136,643,000
St. Joseph Capital Trust II |
Debt Instrument [Line Items] |
Issuance Amount | $ 5,155,000
Rate | 2.66%
St. Joseph Capital Trust II | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.75%
Anchor Capital Trust III |
Debt Instrument [Line Items] |
Issuance Amount | $ 5,000,000
Rate | 2.56%
Anchor Capital Trust III | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.55%
Home Federal Statutory Trust I |
Debt Instrument [Line Items] |
Issuance Amount | $ 15,464,000
Rate | 2.48%
Home Federal Statutory Trust I | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.65%
Monroe Bancorp Capital Trust I |
Debt Instrument [Line Items] |
Issuance Amount | $ 3,093,000
Rate | 1.84%
Monroe Bancorp Capital Trust I | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.60%
Tower Capital Trust 3 |
Debt Instrument [Line Items] |
Issuance Amount | $ 9,279,000
Rate | 2.21%
Tower Capital Trust 3 | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.69%
Monroe Bancorp Statutory Trust II |
Debt Instrument [Line Items] |
Issuance Amount | $ 5,155,000
Rate | 2.43%
Monroe Bancorp Statutory Trust II | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.60%
First Midwest Capital Trust I |
Debt Instrument [Line Items] |
Issuance Amount | $ 37,825,000
Fixed rate | 6.95%
Rate | 6.95%
Great Lakes Statutory Trust II |
Debt Instrument [Line Items] |
Issuance Amount | $ 6,186,000
Rate | 2.23%
Great Lakes Statutory Trust II | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.40%
Great Lakes Statutory Trust III |
Debt Instrument [Line Items] |
Issuance Amount | $ 8,248,000
Rate | 2.53%
Great Lakes Statutory Trust III | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.70%
Northern States Statutory Trust I |
Debt Instrument [Line Items] |
Issuance Amount | $ 10,310,000
Rate | 2.63%
Northern States Statutory Trust I | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 1.80%
Bridgeview Statutory Trust I |
Debt Instrument [Line Items] |
Issuance Amount | $ 15,464,000
Rate | 3.88%
Bridgeview Statutory Trust I | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 3.58%
Bridgeview Capital Trust II |
Debt Instrument [Line Items] |
Issuance Amount | $ 15,464,000
Rate | 3.58%
Bridgeview Capital Trust II | LIBOR |
Debt Instrument [Line Items] |
Variable rate | 3.35%

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=onb_TrustPreferredSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_StJosephCapitalTrustIiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_AnchorCapitalTrustIIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_HomeFederalStatutoryTrustIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_MonroeBancorpCapitalTrustIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_TowerCapitalTrustThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_MonroeBancorpStatutoryTrustIiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_FirstMidwestCapitalTrustIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_GreatLakesStatutoryTrustIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_GreatLakesStatutoryTrustIIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_NorthernStatesStatutoryTrustIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_BridgeviewCapitalTrustIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=onb_BridgeviewCapitalTrustIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |