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Regulatory and Capital Matters - Summary of Capital Ratios (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
First Midwest Bancorp, Inc.    
Total capital to risk-weighted assets:    
Actual Capital $ 1,626,489,000 $ 1,448,124,000
Actual Ratio (percent) 12.62% 12.15%
Adequately Capitalized Capital $ 1,273,103,000 $ 1,102,634,000
Adequately Capitalized Ratio (percent) 9.875% 9.25%
Tier 1 capital to risk-weighted assets:    
Actual Capital $ 1,315,098,000 $ 1,204,468,000
Actual Ratio (percent) 10.20% 10.10%
Adequately Capitalized Capital $ 1,015,259,000 $ 864,227,000
Adequately Capitalized Ratio (percent) 7.875% 7.25%
CET1 to risk-weighted assets:    
Actual Capital $ 1,315,432,000 $ 1,153,939,000
Actual Ratio (percent) 10.20% 9.68%
Adequately Capitalized Capital $ 821,876,000 $ 685,421,000
Adequately Capitalized Ratio (percent) 6.375% 5.75%
Tier 1 capital to average assets:    
Actual Capital $ 1,315,098,000 $ 1,204,468,000
Actual Ratio (percent) 8.90% 8.99%
Adequately Capitalized Capital $ 591,293,000 $ 536,200,000
Adequately Capitalized Ratio (percent) 4.00% 4.00%
First Midwest Bank    
Total capital to risk-weighted assets:    
Actual Capital $ 1,463,026,000 $ 1,300,809,000
Actual Ratio (percent) 11.39% 10.95%
Adequately Capitalized Capital $ 1,268,662,000 $ 1,099,133,000
Adequately Capitalized Ratio (percent) 9.875% 9.25%
To Be Well-Capitalized Under Prompt Corrective Action Provisions Capital $ 1,284,721,000 $ 1,188,252,000
To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio (percent) 10.00% 10.00%
Tier 1 capital to risk-weighted assets:    
Actual Capital $ 1,359,607,000 $ 1,204,080,000
Actual Ratio (percent) 10.58% 10.13%
Adequately Capitalized Capital $ 1,011,718,000 $ 861,482,000
Adequately Capitalized Ratio (percent) 7.875% 7.25%
To Be Well-Capitalized Under Prompt Corrective Action Provisions Capital $ 1,027,777,000 $ 950,601,000
To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio (percent) 8.00% 8.00%
CET1 to risk-weighted assets:    
Actual Capital $ 1,359,607,000 $ 1,204,080,000
Actual Ratio (percent) 10.58% 10.13%
Adequately Capitalized Capital $ 819,009,000 $ 683,245,000
Adequately Capitalized Ratio (percent) 6.375% 5.75%
To be Well-Capitalized Under Prompt Corrective Action Provisions Capital $ 835,068,000 $ 772,364,000
To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio ( percent) 6.50% 6.50%
Tier 1 capital to average assets:    
Actual Capital $ 1,359,607,000 $ 1,204,080,000
Actual Ratio (percent) 9.41% 9.10%
Adequately Capitalized Capital $ 577,991,000 $ 529,147,000
Adequately Capitalized Ratio (percent) 4.00% 4.00%
To Be Well-Capitalized Under Prompt Corrective Action Provisions Capital $ 722,488,000 $ 661,434,000
To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio (percent) 5.00% 5.00%