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Regulatory Restrictions - Schedule of Capital Ratios (Details) $ in Thousands | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Old National Bancorp |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital to risk-weighted assets actual, amount | $ 6,889,846 | $ 5,388,882
Common equity Tier 1 capital to risk-weighted assets actual, amount | 5,939,683 | 4,587,674
Tier 1 capital to risk-weighted assets actual, amount | 6,183,402 | 4,831,393
Tier 1 capital to average assets actual, amount | $ 6,183,402 | $ 4,831,393
Total capital to risk-weighted assets actual, ratio | 0.1285 | 0.1337
Common equity Tier 1 capital to risk-weighted assets actual, ratio | 11.08% | 11.38%
Tier 1 capital to risk-weighted assets actual, ratio | 0.1153 | 0.1198
Tier 1 capital to average assets actual, ratio | 0.0890 | 0.0921
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | $ 5,629,850 | $ 4,233,054
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | 3,753,233 | 2,822,036
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | 4,557,498 | 3,426,758
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, amount | $ 2,778,362 | $ 2,097,820
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio | 0.1050 | 0.1050
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio | 7.00% | 7.00%
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio | 0.0850 | 0.0850
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, ratio | 0.0400 | 0.0400
Total capital to risk-weighted assets well capitalized guidelines, amount | $ 5,361,762 | $ 4,031,480
Tier 1 capital to risk-weighted assets well capitalized guidelines, amount | $ 3,217,057 | $ 2,418,888
Total capital to risk-weighted assets well capitalized guidelines, ratio | 0.1000 | 0.1000
Tier 1 capital to risk-weighted assets well capitalized guidelines, ratio | 0.0600 | 0.0600
Old National Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital to risk-weighted assets actual, amount | $ 6,407,355 | $ 5,103,487
Common equity Tier 1 capital to risk-weighted assets actual, amount | 5,899,410 | 4,742,641
Tier 1 capital to risk-weighted assets actual, amount | 5,899,410 | 4,742,641
Tier 1 capital to average assets actual, amount | $ 5,899,410 | $ 4,742,641
Total capital to risk-weighted assets actual, ratio | 0.1200 | 0.1272
Common equity Tier 1 capital to risk-weighted assets actual, ratio | 11.05% | 11.82%
Tier 1 capital to risk-weighted assets actual, ratio | 0.1105 | 0.1182
Tier 1 capital to average assets actual, ratio | 0.0852 | 0.0907
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | $ 5,604,101 | $ 4,214,255
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | 3,736,067 | 2,809,504
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | 4,536,653 | 3,411,540
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, amount | $ 2,768,451 | $ 2,090,427
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio | 0.1050 | 0.1050
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio | 7.00% | 7.00%
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio | 0.0850 | 0.0850
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, ratio | 0.0400 | 0.0400
Total capital to risk-weighted assets well capitalized guidelines, amount | $ 5,337,239 | $ 4,013,577
Common equity Tier 1 capital to risk-weighted assets well capitalized guidelines, amount | 3,469,205 | 2,608,825
Tier 1 capital to risk-weighted assets well capitalized guidelines, amount | 4,269,791 | 3,210,861
Tier 1 capital to average assets well capitalized guidelines, amount | $ 3,460,563 | $ 2,613,033
Total capital to risk-weighted assets well capitalized guidelines, ratio | 0.1000 | 0.1000
Common equity Tier 1 capital to risk-weighted assets well capitalized guidelines, ratio | 6.50% | 6.50%
Tier 1 capital to risk-weighted assets well capitalized guidelines, ratio | 0.0800 | 0.0800
Tier 1 capital to average assets well capitalized guidelines, ratio | 0.0500 | 0.0500

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