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Loans - Summary of Loan Portfolio (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 335,086 $ 287,102
Allowance for loan losses (3,271) (3,239)
Net deferred loan costs and fees, and purchase premiums 1,176 1,288
Net loans 332,991 285,151
Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 326,441 282,460
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 88,394 74,911
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 2,067 2,040
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 6,578 2,602
One-to-Four Family [Member] | Residential Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 179,025 166,483
One-to-Four Family [Member] | Residential Real Estate [Member] | Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 179,025 166,483
Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member] | Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 35,393 33,259
Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 23,629 7,807
Construction [Member] | Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 23,629 $ 7,807