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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
USD ($)
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Basis Of Presentation [Line Items]          
Federal funds sold   $ 65,100 $ 158,700    
Total shareholders’ equity   $ 5,296,800 5,161,334 $ 4,941,690 $ 3,133,602
Number of reportable segments | segment   3      
Federal reserve bank stock   $ 143,700 142,500    
Required percent of capital or surplus   6.00%      
Required percent of deposits   0.60%      
Federal home loan bank stock   $ 16,200 15,000    
Vesting period   3 years      
Cumulative Effect, Period of Adoption, Adjustment          
Basis Of Presentation [Line Items]          
Total shareholders’ equity       (35,721) [1] 4,270
Retained Earnings          
Basis Of Presentation [Line Items]          
Total shareholders’ equity   $ 1,709,980 $ 1,178,019 1,068,327 843,767
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment          
Basis Of Presentation [Line Items]          
Total shareholders’ equity $ 35,700     $ (35,721) [1] $ 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      
Unfunded Loan Commitment          
Basis Of Presentation [Line Items]          
Financing receivable, purchased with credit deterioration, amount at purchase price $ 62,200        
DRR Methodology          
Basis Of Presentation [Line Items]          
Loans, net   41.00% 40.00%    
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      
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      
[1] For additional information, see "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies.