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Regulatory and Capital Matters - Summary of Capital Ratios (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
First Midwest Bancorp, Inc.    
Total capital to risk-weighted assets:    
Actual Capital $ 1,843,597,000 $ 1,626,489,000
Actual Ratio (percent) 12.96% 12.62%
Adequately Capitalized Capital $ 1,493,672,000 $ 1,273,103,000
Adequately Capitalized Ratio (percent) 10.50% 9.875%
Tier 1 capital to risk-weighted assets:    
Actual Capital $ 1,496,048,000 $ 1,315,098,000
Actual Ratio (percent) 10.52% 10.20%
Adequately Capitalized Capital $ 1,209,163,000 $ 1,015,259,000
Adequately Capitalized Ratio (percent) 8.50% 7.875%
CET1 to risk-weighted assets:    
Actual Capital $ 1,496,048,000 $ 1,315,432,000
Actual Ratio (percent) 10.52% 10.20%
Adequately Capitalized Capital $ 995,781,000 $ 821,876,000
Adequately Capitalized Ratio (percent) 7.00% 6.375%
Tier 1 capital to average assets:    
Actual Capital $ 1,496,048,000 $ 1,315,098,000
Actual Ratio (percent) 8.81% 8.90%
Adequately Capitalized Capital $ 679,365,000 $ 591,293,000
Adequately Capitalized Ratio (percent) 4.00% 4.00%
First Midwest Bank    
Total capital to risk-weighted assets:    
Actual Capital $ 1,598,886,000 $ 1,463,026,000
Actual Ratio (percent) 11.28% 11.39%
Adequately Capitalized Capital $ 1,488,796,000 $ 1,268,662,000
Adequately Capitalized Ratio (percent) 10.50% 9.875%
To Be Well-Capitalized Under Prompt Corrective Action Provisions Capital $ 1,417,901,000 $ 1,284,721,000
To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio (percent) 10.00% 10.00%
Tier 1 capital to risk-weighted assets:    
Actual Capital $ 1,489,664,000 $ 1,359,607,000
Actual Ratio (percent) 10.51% 10.58%
Adequately Capitalized Capital $ 1,205,215,000 $ 1,011,718,000
Adequately Capitalized Ratio (percent) 8.50% 7.875%
To Be Well-Capitalized Under Prompt Corrective Action Provisions Capital $ 1,134,320,000 $ 1,027,777,000
To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio (percent) 8.00% 8.00%
CET1 to risk-weighted assets:    
Actual Capital $ 1,489,664,000 $ 1,359,607,000
Actual Ratio (percent) 10.51% 10.58%
Adequately Capitalized Capital $ 992,530,000 $ 819,009,000
Adequately Capitalized Ratio (percent) 7.00% 6.375%
To be Well-Capitalized Under Prompt Corrective Action Provisions Capital $ 921,635,000 $ 835,068,000
To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio ( percent) 6.50% 6.50%
Tier 1 capital to average assets:    
Actual Capital $ 1,489,664,000 $ 1,359,607,000
Actual Ratio (percent) 8.79% 9.41%
Adequately Capitalized Capital $ 677,570,000 $ 577,991,000
Adequately Capitalized Ratio (percent) 4.00% 4.00%
To Be Well-Capitalized Under Prompt Corrective Action Provisions Capital $ 846,963,000 $ 722,488,000
To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio (percent) 5.00% 5.00%