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Accumulated Other Comprehensive Income (Schedule Of Reclassification Out Of Accumulated Other Comprehensive Income) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Net realized gain on investment $ 16,344 $ 192,881
Prior year service cost 380 (2,349)
Unrecognized loss (1,573) (170)
Total 4,751,418 1,945,139
Tax (1,365,000) (513,000)
Reclassifications for the period, net of tax 3,386,418 1,432,139
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications for the period, net of tax 10,694 125,163
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Gains And Losses On Available-For-Sale Securities [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Net realized gain on investment 34,829 192,881
Other-than-temporary impairments (18,485)  
Total 16,344  
Tax (4,862) (66,056)
Reclassifications for the period, net of tax 11,482 126,825
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Postretirement Benefits Plans [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Prior year service cost 380 (2,349)
Unrecognized loss (1,573) (170)
Total (1,193) [1] (2,519) [1]
Tax 405 857
Reclassifications for the period, net of tax $ (788) $ (1,662)
[1] These accumulated other comprehensive income components are not reclassified to net income in their entirety in the same reporting period. The amounts are presented within salaries, employee benefits and payroll taxes on the Consolidated Statements of Income as amortized. Amortization related to postretirement benefit plans is included in the computation of net periodic pension costs, as discussed in Note 5.