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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Change in Accounting Principle          
Allowance for credit loss   $ 406,383 $ 113,052 $ 147,972 $ 157,446
Reclassification into nonaccrual loans $ 73,400 250,475 169,658    
Reduction in retained earnings   $ 1,732,932 1,896,427    
Forecast period   24 months      
Historical loss reversion period   12 months      
Accounting Standards Update 2016-13          
Change in Accounting Principle          
Projected increase in allowance for loan losses, percent 20.00%        
Allowance for loan and lease losses 80.00%        
Cumulative Effect, Period of Adoption, Adjustment          
Change in Accounting Principle          
Allowance for credit loss     205,992    
Reclassification of previous purchased credit impaired loans $ 73,400        
Reclassification into nonaccrual loans 73,400        
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13          
Change in Accounting Principle          
Allowance for credit loss 206,000        
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13          
Change in Accounting Principle          
Allowance for credit loss 14,700        
TCF          
Change in Accounting Principle          
Total capital   $ 4,744,899 $ 4,681,630    
TCF | Accounting Standards Update 2016-13          
Change in Accounting Principle          
Total capital $ (159,300)