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Employee Benefit Plans (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
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 IRS determined limits and the Bank may match employee contributions not to exceed 3.0% of compensation depending on contribution level.          
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution (in hundredths) 3.00%   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%          
Expense related to 401(k) plan     $ 272,000 $ 302,000        
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 postretirement plan.          
Pension expense     217,000 232,000        
Accrued pension liability 2,022,000 1,787,000 2,022,000 1,787,000   1,847,000    
Number of post-retirement benefit plans 2   2          
Number of active employees aged 50 and over 7   7          
Post-retirement benefit plan health insurance subsidy range minimum per month per person 40   40          
Post-retirement benefit plan health insurance subsidy range maximum per month per person 1,200   1,200          
Discount Rate (in hundredths) 7.00%   7.00%          
Assumed health care cost trend rate (in hundredths)     7.00%          
Expected future benefit payments, next quarter 34,000   34,000          
Expected future benefit payments, current year 136,000   136,000          
Estimated plan expense 190,000   190,000          
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     1,000          
Unrecognized transition obligation [Abstract]                
Net unrealized loss on postretirement benefit costs (72,000) (59,000) (72,000) (59,000) (77,000) (87,000) (63,000) (73,000)
Amortization of unrecognized transition obligation 7,000 7,000 21,000 21,000        
Related deferred taxes (2,000) (3,000) (6,000) (7,000)        
Net unrealized loss on postretirement benefit costs $ (72,000) $ (59,000) $ (72,000) $ (59,000) $ (77,000) $ (87,000) $ (63,000) $ (73,000)