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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Unit
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
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Jan. 01, 2020
USD ($)
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Maximum refinement period of fair values after closing date of acquisition 1 year      
Allowance for loan losses   $ 195,225    
Loan minimum balance included in specific reserve analysis $ 1      
Number of reporting units | Unit 1      
Tax credit carry back period 1 year      
Tax credit carry forward period 20 years      
Weighted-average anti-dilutive potential common shares | shares 0 15,815 5,129  
Federal NMTC Investment [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Tax credit earning period 7 years      
Low Income Housing Credit Investments [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Tax credit earning period 10 years      
Minimum [Member] | State NMTC Investment [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Tax credit earning period 3 years      
Maximum [Member] | State NMTC Investment [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Tax credit earning period 5 years      
Buildings [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Estimated useful lives of assets 30 years      
Furniture, Fixtures and Equipment [Member] | Minimum [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Estimated useful lives of assets 3 years      
Furniture, Fixtures and Equipment [Member] | Maximum [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Estimated useful lives of assets 10 years      
Software [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Amortization Expense Charged Off Period 3 years      
Core Systems [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Amortization Expense Charged Off Period 7 years      
Topic 326 [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Allowance for loan losses       $ 271,966
Change in accounting principle, accounting standards update, immaterial effect true      
ASU 2018-13 [Member]        
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Change in accounting principle, accounting standards update, immaterial effect true