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Summary of Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Aug. 01, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in Accounting Principle                
Right-of use assets   $ 118,700            
Lease liabilities   138,393            
Loans and leases   34,497,464       $ 19,073,020    
Allowance for loan and lease losses   113,052 $ 113,100     157,446 $ 171,041 $ 160,269
Reduction to retained earnings, due to the adoption of new accounting guidance   $ (1,896,427)       $ (1,766,994)    
Accounting Standards Update 2016-02                
Change in Accounting Principle                
Right-of use assets         $ 91,900      
Lease liabilities         $ 112,800      
Scenario, Forecast | Accounting Standards Update 2019-05                
Change in Accounting Principle                
Allowance for loans and leases receivable, pro forma percent increase 20.00%              
Allowance for acquired loans and leases receivable, pro forma percent increase 80.00%              
Minimum | Scenario, Forecast | Accounting Standards Update 2019-05                
Change in Accounting Principle                
Allowance for loan and lease losses $ 200,000              
Reduction to retained earnings, due to the adoption of new accounting guidance 160,000              
Maximum | Scenario, Forecast | Accounting Standards Update 2019-05                
Change in Accounting Principle                
Allowance for loan and lease losses 225,000              
Reduction to retained earnings, due to the adoption of new accounting guidance 175,000              
Chemical Financial Corporation                
Change in Accounting Principle                
Right-of use assets       $ 39,800        
Lease liabilities       $ 41,600        
Unfunded Loan Commitment | Minimum | Scenario, Forecast | Accounting Standards Update 2019-05                
Change in Accounting Principle                
Loans acquired with deteriorated credit quality 10,000              
Unfunded Loan Commitment | Maximum | Scenario, Forecast | Accounting Standards Update 2019-05                
Change in Accounting Principle                
Loans acquired with deteriorated credit quality $ 15,000