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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Number of business segment | Segment 1  
Carrying value and maximum potential loss of equity investments $ 0 $ 0
Carrying value and maximum potential loss exposure of VIEs 1,140,000 934,000
Special assets staff reviews loans, amount $ 250,000  
Loan payments delinquency period beyond which loan is considered non-accrual 90 days  
TDRs evaluated for specific reserve based on collateral or net present value method $ 250,000  
TDRs subject to reserve based on historical loss rate $ 250,000  
Indemnified portion percentage 80.00%  
Operating lease term 20 years  
Investment in FHLB and FRB stock    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Investment owned, at cost $ 10,600,000 $ 10,730,000
Minimum    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Loan delinquent period 30 days  
Furniture, Fixtures and Equipment | Minimum    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Premises and equipment, estimated useful life 5 years  
Furniture, Fixtures and Equipment | Maximum    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Premises and equipment, estimated useful life 10 years  
Software, Hardware, and Data Handling Equipment | Minimum    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Premises and equipment, estimated useful life 3 years  
Software, Hardware, and Data Handling Equipment | Maximum    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Premises and equipment, estimated useful life 5 years  
Building and Building Improvements | Minimum    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Premises and equipment, estimated useful life 10 years  
Building and Building Improvements | Maximum    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Premises and equipment, estimated useful life 40 years  
Land Improvements    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Premises and equipment, estimated useful life 20 years  
Consumer Loan    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Loans charged against the allowance for loan losses, past due days 120 days  
Consumer Loan | Residential Real Estate    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Loans charged against the allowance for loan losses, past due days 180 days  
Other Loans    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Loans charged against the allowance for loan losses, past due days 120 days  
Unsecured Loan | Consumer Loan    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Loans charged against the allowance for loan losses, past due days 90 days