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Loans Receivable and Related Allowance for Loan Losses - Summary of Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total $ 551,533   $ 520,980      
Less allowance for loan losses 5,767 $ 5,688 5,545 $ 5,431 $ 5,352 $ 5,205
Total loans, net 545,766   515,435      
Residential first mortgages            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 214,905   198,167      
Less allowance for loan losses 1,994 1,956 1,846 1,696 1,577 1,429
Home equity loans and lines of credit            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 90,736   91,359      
Less allowance for loan losses 639 648 633 645 636 586
Commercial real estate            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 179,891   166,994      
Less allowance for loan losses 2,460 2,449 2,314 2,118 1,926 2,185
Commercial business            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 58,797   57,788      
Less allowance for loan losses 621 583 700 920 1,162 960
Consumer            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 7,204   6,672      
Less allowance for loan losses 53 $ 52 52 $ 52 $ 51 $ 45
Mortgage loans on real estate            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 485,532   456,520      
Mortgage loans on real estate | Residential first mortgages            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 214,905   198,167      
Mortgage loans on real estate | Home equity loans and lines of credit            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 90,736   91,359      
Mortgage loans on real estate | Commercial real estate            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 179,891   166,994      
Other loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 66,001   64,460      
Other loans | Commercial business            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 58,797   57,788      
Other loans | Consumer            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total $ 7,204   $ 6,672