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Regulatory Restrictions - Schedule of Capital Ratios (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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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 | $ 4,727,216 | $ 4,321,716
Common equity Tier 1 capital to risk-weighted assets actual, amount | 4,003,694 | 3,605,393
Tier 1 capital to risk-weighted assets actual, amount | 4,247,413 | 3,849,112
Tier 1 capital to average assets actual, amount | $ 4,247,413 | $ 3,849,112
Total capital to risk-weighted assets actual, ratio | 0.1264 | 0.1202
Common equity Tier 1 capital to risk-weighted assets actual, ratio | 10.70% | 10.03%
Tier 1 capital to risk-weighted assets actual, ratio | 0.1135 | 0.1071
Tier 1 capital to average assets actual, ratio | 0.0883 | 0.0852
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | $ 3,927,771 | $ 3,774,845
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | 2,618,514 | 2,516,563
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | 3,179,625 | 3,055,827
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, amount | $ 1,923,360 | $ 1,808,108
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 | $ 3,740,735 | $ 3,595,090
Tier 1 capital to risk-weighted assets well capitalized guidelines, amount | $ 2,244,441 | $ 2,157,054
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 | $ 4,591,734 | $ 4,063,363
Common equity Tier 1 capital to risk-weighted assets actual, amount | 4,308,574 | 3,817,402
Tier 1 capital to risk-weighted assets actual, amount | 4,308,574 | 3,817,402
Tier 1 capital to average assets actual, amount | $ 4,308,574 | $ 3,817,402
Total capital to risk-weighted assets actual, ratio | 0.1233 | 0.1135
Common equity Tier 1 capital to risk-weighted assets actual, ratio | 11.57% | 10.66%
Tier 1 capital to risk-weighted assets actual, ratio | 0.1157 | 0.1066
Tier 1 capital to average assets actual, ratio | 0.0899 | 0.0847
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | $ 3,911,089 | $ 3,759,671
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | 2,607,393 | 2,506,448
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount | 3,166,120 | 3,043,544
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, amount | $ 1,916,002 | $ 1,803,426
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 | $ 3,724,847 | $ 3,580,639
Common equity Tier 1 capital to risk-weighted assets well capitalized guidelines, amount | 2,421,150 | 2,327,416
Tier 1 capital to risk-weighted assets well capitalized guidelines, amount | 2,979,878 | 2,864,512
Tier 1 capital to average assets well capitalized guidelines, amount | $ 2,395,003 | $ 2,254,282
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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