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Bank Premises & Equipment - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Bank Premises And Equipment [Line Items]        
Bank premises impairment $ 2,000,000 $ 33,000,000 $ 22,000,000 $ 41,000,000
Branches fair value $ 225,000,000 $ 327,000,000 $ 225,000,000 $ 327,000,000
Branches and undeveloped parcels of land | Chicago market        
Bank Premises And Equipment [Line Items]        
Branches held for sale 46   46  
Impairment as a result of acquisition     $ 14,000,000  
Branches and undeveloped parcels of land | Chicago market | MB Financial, Inc.        
Bank Premises And Equipment [Line Items]        
Branches held for sale 9   9  
Other locations held for sale 11   11  
Branches fair value $ 10,000,000   $ 10,000,000  
Other locations fair value $ 10,000,000   $ 10,000,000  
2018 Branch Optimization Plan | Lower Limit        
Bank Premises And Equipment [Line Items]        
Branches held for sale 100   100  
2018 Branch Optimization Plan | Upper Limit        
Bank Premises And Equipment [Line Items]        
Branches held for sale 125   125  
Closed in 2019        
Bank Premises And Equipment [Line Items]        
Branches held for sale 24   24  
Closed in 2020        
Bank Premises And Equipment [Line Items]        
Branches held for sale 37   37