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Regulatory and Capital Matters (Tables)
12 Months Ended
Dec. 31, 2019
Banking and Thrift [Abstract]  
Summary of Regulatory Capital Ratios
The following table outlines the Company's and the Bank's measures of capital as of the dates presented and the capital guidelines established by the Federal Reserve for the Company and the Bank to be categorized as adequately capitalized and avoid limitations on certain distributions, as well as for the Bank to be categorized as "well-capitalized."
Summary of Regulatory Capital Ratios
(Dollar amounts in thousands)
 Actual
Adequately
Capitalized
To Be Well-Capitalized Under Prompt Corrective Action Provisions
 CapitalRatio %CapitalRatio %CapitalRatio %
As of December 31, 2019      
Total capital to risk-weighted assets:      
First Midwest Bancorp, Inc. $1,843,597  12.96  $1,493,672  10.500  N/A  N/A
First Midwest Bank1,598,886  11.28  1,488,796  10.500  $1,417,901  10.00  
Tier 1 capital to risk-weighted assets:  
First Midwest Bancorp, Inc. 1,496,048  10.52  1,209,163  8.500  N/A  N/A
First Midwest Bank1,489,664  10.51  1,205,215  8.500  1,134,320  8.00  
CET1 to risk-weighted assets:
First Midwest Bancorp, Inc. 1,496,048  10.52  995,781  7.000  N/A  N/A
First Midwest Bank1,489,664  10.51  992,530  7.000  921,635  6.50  
Tier 1 capital to average assets:    
First Midwest Bancorp, Inc. 1,496,048  8.81  679,365  4.000  N/A  N/A
First Midwest Bank1,489,664  8.79  677,570  4.000  846,963  5.00  
As of December 31, 2018      
Total capital to risk-weighted assets:      
First Midwest Bancorp, Inc. $1,626,489  12.62  $1,273,103  9.875  N/A  N/A
First Midwest Bank1,463,026  11.39  1,268,662  9.875  $1,284,721  10.00  
Tier 1 capital to risk-weighted assets:
First Midwest Bancorp, Inc. 1,315,098  10.20  1,015,259  7.875  N/A  N/A
First Midwest Bank1,359,607  10.58  1,011,718  7.875  1,027,777  8.00  
CET1 to risk-weighted assets:
First Midwest Bancorp, Inc. 1,315,432  10.20  821,876  6.375  N/A  N/A
First Midwest Bank1,359,607  10.58  819,009  6.375  835,068  6.50  
Tier 1 capital to average assets:
First Midwest Bancorp, Inc. 1,315,098  8.90  591,293  4.000  N/A  N/A
First Midwest Bank1,359,607  9.41  577,991  4.000  722,488  5.00  
N/A – Not applicable.