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Consolidated Statements Of Comprehensive Income (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]    
Net income $ 1,432,139 $ 1,019,207
Other comprehensive income, before tax:    
Amortization related to prior year service cost 2,349 5,097
Amortization of unrecognized loss 170 643
Unrealized gains on investments arising during the period 1,996,426 680,204
Reclassification adjustment for sale of securities included in net income (192,881) (43,117)
Reclassification adjustment for write-down of securities included in net income   69,277
Other comprehensive income, before tax 1,806,064 712,104
Income tax expense related to postretirement health benefits 857 1,956
Income tax expense related to unrealized gains on investments arising during the year 691,943 231,367
Income tax benefit related to reclassification adjustment for sale of securities included in net income (66,056) (14,739)
Income tax expense related to reclassification adjustment for write-down of securities included in net income   23,889
Net income tax expense on other comprehensive income 626,744 242,473
Other comprehensive income 1,179,320 469,631
Comprehensive income $ 2,611,459 $ 1,488,838