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Label	Element	Value
CARES Act Modification Program [Member]
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	onb_FinancingReceivableNonTroubledDebtRestructuringModificationsAmount	$ 1,303,544,000
Commercial And Commercial Real Estate Portfolio Segments [Member] | CARES Act Modification Program [Member]
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	onb_FinancingReceivableNonTroubledDebtRestructuringModificationsAmount	1,170,119,000
Residential Portfolio Segment [Member] | CARES Act Modification Program [Member]
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	onb_FinancingReceivableNonTroubledDebtRestructuringModificationsAmount	78,639,000
Consumer Portfolio Segment [Member] | CARES Act Modification Program [Member]
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	onb_FinancingReceivableNonTroubledDebtRestructuringModificationsAmount	$ 54,786,000

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