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Regulatory Capital Requirements - Summary of Regulatory Capital Requirements (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Tier 1 leverage ratio      
Capital conservation buffer 2.50%   2.50%
TCF      
Regulatory Capital:      
Common equity Tier 1 capital $ 4,028,681   $ 4,050,826
Tier 1 capital 4,221,283   4,236,648
Total capital $ 4,907,760 $ (159,300) $ 4,681,630
Common equity Tier 1 capital ratio      
Common equity Tier 1 capital - actual, ratio 0.1106   0.1099
Risk-based capital ratios      
Tier 1 risk-based capital - actual, ratio 0.1159   0.1149
Total risk-based capital - actual, ratio 0.1347   0.1270
Tier 1 leverage ratio      
Tier 1 leverage - actual, ratio 0.0875   0.0949
TCF Bank      
Regulatory Capital:      
Common equity Tier 1 capital $ 3,997,522   $ 4,039,191
Tier 1 capital 4,020,822   4,059,417
Total capital $ 4,705,265   $ 4,524,051
Common equity Tier 1 capital ratio      
Common equity Tier 1 capital - actual, ratio 0.1099   0.1097
Common equity Tier 1 capital - well-capitalized capital requirement, ratio 6.50%    
Common equity Tier 1 capital - minimum capital requirement, ratio 4.50%    
Risk-based capital ratios      
Tier 1 risk-based capital - actual, ratio 0.1105   0.1103
Tier 1 risk-based capital - well-capitalized capital requirement, ratio 0.0800    
Tier 1 risk-based capital - minimum capital requirement, ratio 0.0600    
Total risk-based capital - actual, ratio 0.1293   0.1229
Total risk-based capital - well-capitalized capital requirement, ratio 0.1000    
Total risk-based capital - minimum capital requirement, ratio 0.0800    
Tier 1 leverage ratio      
Tier 1 leverage - actual, ratio 0.0834   0.0910
Tier 1 leverage - well-capitalized capital requirement, ratio 0.0500    
Tier 1 leverage - minimum capital requirement, ratio 0.0400