Consolidated Statements Of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements Of Comprehensive Income
Net income	$ 1,594,805	$ 2,537,560	$ 2,614,012	$ 2,554,975
Other comprehensive income, before tax:
Amortization related to prior year service cost	5,097	5,097	10,194	10,194
Amortization of unrecognized loss	643	641	1,286	1,284
Unrealized gains (losses) on investments arising during the year	1,080,784	(271,741)	1,760,987	111,747
Reclassification adjustment for sale of securities included in net income	(186,171)	(340,125)	(229,288)	(435,824)
Reclassification adjustment for write down of securities included in net income	39,096	14,347	108,372	84,895
Other comprehensive income (loss), before tax	939,449	(591,781)	1,651,551	(227,704)
Income tax expense related to postretirement health benefits	1,949	1,952	3,905	3,899
Income tax expense (benefit) related to unrealized gains (losses) on investments arising during the year	367,381	(84,312)	598,747	45,938
Income tax expense related to reclassification adjustment for sale of securities included in net income	(65,462)	(119,324)	(79,219)	(152,055)
Income tax expense related to reclassification adjustment for write down of securities included in net income	15,369	5,530	38,275	30,564
Net income tax expense (benefit) on other comprehensive income	319,237	(196,154)	561,708	(71,654)
Other comprehensive income (loss)	620,212	(395,627)	1,089,843	(156,050)
Comprehensive income	$ 2,215,017	$ 2,141,933	$ 3,703,855	$ 2,398,925