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Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Significant Accounting Policies [Line Items]      
Unrealized gains adjustment, net of tax $ 331,000 $ 201,000  
Unrealized market gain included in accumulated other comprehensive income, tax $ 173,000 103,000  
Credit card and other personal loans charged off period no later than period 180 days    
Percentage of excess loan balance for watch category 90.00%    
Impaired loans measurement Impaired loans measured for impairment generally include (1) non-accruing Special mention, Substandard and Doubtful loans in excess of $250,000; (2) Substandard and Doubtful loans in excess of $500,000; (3) Special Mention loans in excess of $500,000 if any of the loans in the relationship are more than 30 days past due or if the borrower has filed for bankruptcy; and (4) all TDRs.    
Loan Receivables $ 150,292,000 151,305,000  
Special Mention      
Significant Accounting Policies [Line Items]      
Loan Receivables $ 2,842,000 $ 3,954,000  
Loan due days 30 days    
Certificates of deposit      
Significant Accounting Policies [Line Items]      
Unrealized market gain included in accumulated other comprehensive income, tax     $ 20,000
Certificates of deposit | Available-for-sale Securities      
Significant Accounting Policies [Line Items]      
Unrealized gains adjustment, net of tax     $ 31,000
Residential First Mortgages      
Significant Accounting Policies [Line Items]      
Minimum balance in order to assign a risk rating grade $ 1,000,000    
Consumer and Other Loans      
Significant Accounting Policies [Line Items]      
Minimum balance in order to assign a risk rating grade $ 250,000    
Minimum      
Significant Accounting Policies [Line Items]      
Number of days past due for a loan to remain on accrual status 90 days    
Minimum | Non-accruing Special mention, Substandard and Doubtful loans      
Significant Accounting Policies [Line Items]      
Loan Receivables $ 250,000    
Minimum | Substandard and Doubtful loans      
Significant Accounting Policies [Line Items]      
Loan Receivables 500,000    
Minimum | Special Mention      
Significant Accounting Policies [Line Items]      
Loan Receivables $ 500,000