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Summary of Significant Accounting Policies - Summary of Premises and Equipment (Details)
9 Months Ended
Sep. 30, 2021
Land improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 3 years
Land improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 10 years
Office building and improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 10 years
Office building and improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 40 years
Furniture and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 3 years
Furniture and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 10 years