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Loans Receivable and Related Allowance for Loan Losses - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Deferred costs $ 1,400,000   $ 1,400,000     $ 1,300,000    
Allowance for loan losses 5,767,000 $ 5,431,000 5,767,000 $ 5,431,000 $ 5,688,000 5,545,000 $ 5,352,000 $ 5,205,000
Loans classified as TDRs 537,000   537,000     239,000    
Allowance loan losses allocated to TDRs $ 8,000   $ 8,000     19,000    
Threshold period past due for payment default consideration     30 days          
Number of loans modified | loan 0              
Loans modified as TDRs with payment default after 12 months of modification | loan 0 0 0 0        
IWeighted average period of loss estimate     3 years          
Residential first mortgages                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan losses $ 1,994,000 $ 1,696,000 $ 1,994,000 $ 1,696,000 1,956,000 1,846,000 1,577,000 1,429,000
Loans classified as TDRs 323,000   323,000          
Allowance loan losses allocated to TDRs 0   $ 0          
Number of loans modified | loan     1          
Home equity loans and lines of credit                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan losses 639,000 645,000 $ 639,000 645,000 $ 648,000 $ 633,000 $ 636,000 $ 586,000
Loans classified as TDRs   10,000   10,000        
Allowance loan losses allocated to TDRs   $ 0   $ 0        
Number of loans modified | loan   1   1        
United American Savings Bank                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan losses 0   $ 0          
Mortgage loans on real estate | Residential first mortgages                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Sale of loans held-for-investment $ 1,100,000