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Summary of Significant Accounting Policies - Schedule of Estimated Useful for Premises and Equipment (Details)
12 Months Ended
Dec. 31, 2020
Equipment and Furniture | Minimum  
Property Plant And Equipment [Line Items]  
Estimated useful lives for premises and equipment 3 years
Equipment and Furniture | Maximum  
Property Plant And Equipment [Line Items]  
Estimated useful lives for premises and equipment 10 years
Buildings  
Property Plant And Equipment [Line Items]  
Estimated useful lives for premises and equipment 40 years
Automobile  
Property Plant And Equipment [Line Items]  
Estimated useful lives for premises and equipment 5 years