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Regulatory Restrictions - Schedule of Capital Ratios (Detail) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Minimum | Basel III Capital Rules |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Ratio | 0.040 |
Old National Bancorp |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital to risk-weighted assets Actual, Amount | $ 1,949,757 | $ 1,828,312
Common equity Tier 1 capital to risk-weighted assets Actual, Amount | 1,805,194 | 1,706,727
Tier 1 capital to risk-weighted assets Actual, Amount | 1,805,194 | 1,706,727
Tier 1 capital to average assets Actual, Amount | $ 1,805,194 | $ 1,706,727
Total capital to risk-weighted assets Actual, Ratio | 0.1269 | 0.1299
Common equity Tier 1 capital to risk-weighted assets Actual, Ratio | 11.75% | 12.13%
Tier 1 capital to risk-weighted assets Actual, Ratio | 0.1175 | 0.1213
Tier 1 capital to average assets Actual, Ratio | 0.0820 | 0.0888
Total capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | $ 1,613,753 | $ 1,477,763
Common equity Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | 1,075,835 | 985,175
Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | 1,306,371 | 1,196,284
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Amount | $ 880,845 | $ 768,537
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
Old National Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital to risk-weighted assets Actual, Amount | $ 1,973,180 | $ 1,891,612
Common equity Tier 1 capital to risk-weighted assets Actual, Amount | 1,870,617 | 1,822,337
Tier 1 capital to risk-weighted assets Actual, Amount | 1,870,617 | 1,822,737
Tier 1 capital to average assets Actual, Amount | $ 1,870,617 | $ 1,822,737
Total capital to risk-weighted assets Actual, Ratio | 0.1290 | 0.1350
Common equity Tier 1 capital to risk-weighted assets Actual, Ratio | 12.23% | 13.01%
Tier 1 capital to risk-weighted assets Actual, Ratio | 0.1223 | 0.1301
Tier 1 capital to average assets Actual, Ratio | 0.0867 | 0.0962
Total capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | $ 1,606,657 | $ 1,471,122
Common equity Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | 1,071,104 | 980,748
Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | 1,300,627 | 1,190,909
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Amount | $ 863,087 | $ 757,783
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 | $ 1,530,149 | $ 1,401,069
Common equity Tier 1 capital to risk-weighted assets Well Capitalized Guidelines, Amount | 994,597 | 910,695
Tier 1 capital to risk-weighted assets Well Capitalized Guidelines, Amount | 1,224,119 | 1,120,855
Tier 1 capital to average assets Well Capitalized Guidelines, Amount | $ 1,078,859 | $ 947,228
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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