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Employee Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Defined contribution plan [Abstract]        
Description of defined contribution pension plan The Bank has a defined contribution plan available to substantially all employees who have completed three months of service. Employees may contribute up to IRS-determined limits and the Bank may provide a match to employee contributions not to exceed 3.0% of compensation depending on contribution level. Subject to a vote of the Board of Directors, the Bank may also make a profit-sharing contribution to the Plan.      
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution (in hundredths) 3.00%      
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee (in hundredths) 2.00% 2.00% 2.00%  
Expense related to 401(k) plan $ 363,000 $ 341,000 $ 362,000  
Defined benefit plans, general information The Bank also provides unfunded, non-qualified supplemental retirement benefits for certain officers, payable in installments over 20 years upon retirement or death. The agreements consist of individual contracts with differing characteristics that, when taken together, do not constitute a post-retirement plan.      
Pension expense 289,000 307,000 230,000  
Accrued pension liability 2,080,000 1,847,000    
Number of post-retirement benefit plans 2      
Number of active employees aged 50 and over 7      
Post-retirement benefit plan health insurance subsidy range minimum per month per person 40      
Post-retirement benefit plan health insurance subsidy range maximum per month per person 1,200      
Expected future benefit payments, current year 102,000      
Estimated plan expense 112,000      
Unrecognized transition obligation [Abstract]        
Net unrecognized loss on postretirement benefit costs (123,000) (87,000) (73,000) 12,000
Amortization of unrecognized transition obligation (57,000) (22,000)    
Related deferred taxes 21,000 8,000    
Net unrealized loss on postretirement benefits $ (123,000) $ (87,000) $ (73,000) $ 12,000