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Loans - Additional Information (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Loan
Dec. 31, 2016
USD ($)
Loan
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Accounts Notes And Loans Receivable [Line Items]          
Loans acquired       $ 10,200,000 $ 15,600,000
Participating interest of acquired loan percentage   90.00%      
Number of loans secured by liens on automobiles | Loan   1,231      
Number of loans outstanding | Loan   1,082      
Loans acquired carrying amount   $ 19,600,000      
Number of acquired loan charged-off as uncollectible | Loan   2      
Acquired loans charged-off as uncollectible   $ 44,800      
Notes, Loans and Financing Receivable, Net [Abstract]          
Ninety days past due and still accruing interest $ 0 0 $ 0    
Impairment of provision for loan losses 29,000 $ 388,000 $ 304,000    
Troubled Debt Restructuring During Prior Twelve Months [Member]          
Notes, Loans and Financing Receivable, Net [Abstract]          
Number of loans subsequently defaulted | Loan   0 0    
Real Estate [Member]          
Notes, Loans and Financing Receivable, Net [Abstract]          
Percentage of total loan portfolio   76.00% 78.00%    
Impairment of provision for loan losses   $ 247,000 $ 161,000    
Residential Mortgage Loans [Member]          
Notes, Loans and Financing Receivable, Net [Abstract]          
Residential mortgage loans pledged to FHLBNY as blanket collateral $ 140,300,000 $ 148,100,000 $ 140,300,000    
Number of loans | Loan     3    
Pre-modification recorded investment     $ 127,000    
Post-modification recorded investment     $ 135,000    
Commercial Loans [Member] | Real Estate [Member]          
Notes, Loans and Financing Receivable, Net [Abstract]          
Number of loans | Loan   1 1    
Pre-modification recorded investment   $ 2,000,000 $ 2,088,000    
Post-modification recorded investment   $ 2,000,000 $ 2,088,000    
Minimum [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Maturity period of acquired loans   2 years      
Maximum [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Maturity period of acquired loans   6 years