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Share-Based Compensation (Detail) - USD ($) shares in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Remaining shares available for issuance (in shares) | 2,500 |
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted during period (in shares) | 100 |
Share-based compensation awards, vesting period | 36 months |
Nonvested shares outstanding (in shares) | 500 |
Unrecognized compensation expense | $ 6,200,000 |
Expected weighted-average period for cost recognition | 2 years 1 month 6 days |
Share-based compensation expense | $ 700,000 | $ 700,000
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted during period (in shares) | 200 |
Share-based compensation awards, vesting period | 36 months |
Nonvested shares outstanding (in shares) | 900 |
Unrecognized compensation expense | $ 6,400,000 |
Expected weighted-average period for cost recognition | 2 years 2 months 12 days |
Share-based compensation expense | $ 600,000 | $ 1,400,000
Stock Options | Old National Bancorp |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Incremental expense associated with conversion of stock appreciation rights | $ 0 |
Stock Appreciation Rights (SARs) | Old National Bancorp |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Nonvested shares outstanding (in shares) | 28 |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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