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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]    
Cash and cash equivalent maturity period 90 days  
Mortgage loans held for sale $ 0 $ 0
Number of days within which accrual of interest income discontinues 90 days  
Period of consumer loans charged off 120 days  
Useful life of assets 60 months  
Goodwill impairment $ 0 0
Minimum probability for recognizing tax benefit 50.00%  
Unrecognized tax benefits $ 0 $ 0
Contractual obligation 5,969,000  
Operating Lease Commitments    
Summary Of Significant Accounting Policies [Line Items]    
Contractual obligation $ 5,969,000  
Buildings and Improvements | Minimum    
Summary Of Significant Accounting Policies [Line Items]    
Useful life of assets 30 years  
Buildings and Improvements | Maximum    
Summary Of Significant Accounting Policies [Line Items]    
Useful life of assets 40 years  
Furniture, Fixtures and Equipment | Minimum    
Summary Of Significant Accounting Policies [Line Items]    
Useful life of assets 3 years  
Furniture, Fixtures and Equipment | Maximum    
Summary Of Significant Accounting Policies [Line Items]    
Useful life of assets 10 years