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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Useful Lives of Principal Classes of Assets The ranges of useful lives of the principal classes of assets are as follows:
 
Bank premises
    
15 - 39 years
Leasehold improvements
    
Shorter of estimated economic lives of 15 years or term of the lease.
Computer equipment
    
3 - 7 years
Furniture, fixtures and equipment
    
5  - 10 years