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Regulatory Restrictions - Schedule of Capital Ratios (Details) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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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 | $ 2,119,176 | $ 1,949,757
Common equity Tier 1 capital to risk-weighted assets Actual, Amount | 1,998,056 | 1,805,194
Tier 1 capital to risk-weighted assets Actual, Amount | 1,998,056 | 1,805,194
Tier 1 capital to average assets Actual, Amount | $ 1,998,056 | $ 1,805,194
Total capital to risk-weighted assets Actual, Ratio | 0.1277 | 0.1269
Common equity Tier 1 capital to risk-weighted assets Actual, Ratio | 12.04% | 11.75%
Tier 1 capital to risk-weighted assets Actual, Ratio | 0.1204 | 0.1175
Tier 1 capital to average assets Actual, Ratio | 0.0859 | 0.0820
Total capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | $ 1,741,789 | $ 1,613,753
Common equity Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | 1,161,193 | 1,075,835
Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | 1,410,020 | 1,306,371
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Amount | $ 930,318 | $ 880,845
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 | $ 2,119,405 | $ 1,973,180
Common equity Tier 1 capital to risk-weighted assets Actual, Amount | 2,040,285 | 1,870,617
Tier 1 capital to risk-weighted assets Actual, Amount | 2,040,285 | 1,870,617
Tier 1 capital to average assets Actual, Amount | $ 2,040,285 | $ 1,870,617
Total capital to risk-weighted assets Actual, Ratio | 0.1282 | 0.1290
Common equity Tier 1 capital to risk-weighted assets Actual, Ratio | 12.34% | 12.23%
Tier 1 capital to risk-weighted assets Actual, Ratio | 0.1234 | 0.1223
Tier 1 capital to average assets Actual, Ratio | 0.0881 | 0.0867
Total capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | $ 1,735,385 | $ 1,606,657
Common equity Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | 1,156,923 | 1,071,104
Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount | 1,404,835 | 1,300,627
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Amount | $ 926,821 | $ 863,087
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 | $ 1,652,748 | $ 1,530,149
Common equity Tier 1 capital to risk-weighted assets Well Capitalized Guidelines, Amount | 1,074,286 | 994,597
Tier 1 capital to risk-weighted assets Well Capitalized Guidelines, Amount | 1,322,198 | 1,224,119
Tier 1 capital to average assets Well Capitalized Guidelines, Amount | $ 1,158,526 | $ 1,078,859
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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