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Employee Benefit Plans (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
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 3 months of service. Employees may contribute up to $17,000 of their compensation if under age 50 and $22,500 if age 50 or over, and the Bank may match employee contributions not to exceed 3.0% of compensation depending on contribution level.    
Employees maximum contribution amount to defined contribution plan if under age limit threshold $ 17,000    
Employee age limit threshold used to determine maximum contribution level to defined contribution plan 50    
Employees maximum contribution amount to defined contribution plan if over age limit threshold 22,500    
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%    
Expense related to 401(k) plan 92,000 102,000  
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.    
Pension expense 77,000 73,000  
Accrued pension liability 1,911,000 1,656,000 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    
Discount Rate (in hundredths) 7.00%    
Assumed health care cost trend rate (in hundredths) 7.00%    
Expected future benefit payments, next quarter 34,000    
Expected future benefit payments, current year 136,000    
Estimated plan expense 165,000    
Effect of one percentage point increase on accumulated benefit obligation 100,000    
Effect of One Percentage Point Increase on Interest Cost Components 7,000    
Effect of One Percentage Point Increase on Service Cost Components $ 1,400