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Summary of Significant Accounting Policies (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Basis Of Presentation [Line Items]          
Cash and cash equivalents     $ 111,500    
Federal funds sold   $ 158,700 87,800    
Number of reportable segments | segment   3      
Federal Reserve Bank stock   $ 142,500 141,700    
Required percent of capital or surplus   6.00%      
Required percent of deposits   0.60%      
Federal Home Loan Bank stock   $ 15,000 144,700    
Vesting period   3 years      
Financing Receivable, Allowance for Credit Loss $ 281,402 $ 605,736 281,402 $ 250,555 $ 249,268
Reserve for Unfunded Commitments 1,375 47,800      
All Financing Receivable, Allowance for Credit Loss 282,777 653,500      
Loans, net 36,881,048        
Retained earnings 1,068,327 1,178,019 1,068,327    
Total shareholders’ equity   5,161,334 4,941,690 3,133,602 2,961,566
Deferred fees and costs, net   77,700 25,400    
Accounting Standards Update 2016-02          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss   364,396      
Reserve for Unfunded Commitments   28,815      
All Financing Receivable, Allowance for Credit Loss   393,211      
Loans, net   36,860,281      
Retained earnings   1,032,606      
Cumulative Effect, Period of Adoption, Adjustment          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss 82,994        
Reserve for Unfunded Commitments 27,440        
All Financing Receivable, Allowance for Credit Loss 110,434        
Loans, net (20,767)        
Retained earnings (35,721)        
Total shareholders’ equity     (35,721) 4,270  
Retained Earnings          
Basis Of Presentation [Line Items]          
Total shareholders’ equity   $ 1,178,019 1,068,327 843,767 $ 544,207
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment          
Basis Of Presentation [Line Items]          
Total shareholders’ equity 35,700   (35,721) $ 4,270  
Non-employee Director          
Basis Of Presentation [Line Items]          
Vesting period   3 years      
Non-employee          
Basis Of Presentation [Line Items]          
Vesting period   3 years      
Consumer mortgages          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss 68,190        
Consumer mortgages | Accounting Standards Update 2016-02          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss   $ 154,145      
Consumer mortgages | Cumulative Effect, Period of Adoption, Adjustment          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss 85,955        
Unfunded Loan Commitment          
Basis Of Presentation [Line Items]          
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price 62,200        
Financing Receivable, Allowance for Credit Loss     $ 1,400    
Total commercial and industrial          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss 145,782        
Total commercial and industrial | Accounting Standards Update 2016-02          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss   143,472      
Total commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss (2,310)        
Total commercial real estate          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss 67,430        
Total commercial real estate | Accounting Standards Update 2016-02          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss   66,779      
Total commercial real estate | Cumulative Effect, Period of Adoption, Adjustment          
Basis Of Presentation [Line Items]          
Financing Receivable, Allowance for Credit Loss $ (651)        
Payment Protection Program Loans          
Basis Of Presentation [Line Items]          
Deferred fees and costs, net   $ (48,900)      
DRR Methodology          
Basis Of Presentation [Line Items]          
Loans, net   40.00% 45.00%    
Maximum          
Basis Of Presentation [Line Items]          
Other intangible assets, useful life   10 years      
Maximum | Buildings and improvements          
Basis Of Presentation [Line Items]          
Premises and equipment, useful life   40 years      
Maximum | Furniture, equipment and software          
Basis Of Presentation [Line Items]          
Premises and equipment, useful life   10 years      
Maximum | Software and Software Development Costs          
Basis Of Presentation [Line Items]          
Premises and equipment, useful life   7 years      
Minimum          
Basis Of Presentation [Line Items]          
Other intangible assets, useful life   8 years      
Minimum | Buildings and improvements          
Basis Of Presentation [Line Items]          
Premises and equipment, useful life   10 years      
Minimum | Furniture, equipment and software          
Basis Of Presentation [Line Items]          
Premises and equipment, useful life   3 years      
Minimum | Software and Software Development Costs          
Basis Of Presentation [Line Items]          
Premises and equipment, useful life   3 years