Consolidated Statements Of Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 6,933,936	$ 6,372,626
Other comprehensive income, before tax:
Amortization related to prior year service cost	13,038	20,388
Amortization of unrecognized (loss) gain	(318)	2,572
Accumulated postretirement (benefit) expense obligation adjustment	(115,089)	163,503
Unrealized gains on investments arising during the year	2,886,294	1,951,329
Reclassification adjustment for sale of securities included in net income	(353,950)	(1,084,915)
Reclassification adjustment for write-down of securities included in net income	325,391	430,241
Other comprehensive income, before tax	2,755,366	1,483,118
Income tax (benefit) expense related to postretirement health benefits	(34,804)	63,398
Income tax expense related to unrealized gains on investments arising during the year	976,277	680,503
Income tax benefit related to reclassification adjustment for sale of securities included in net income	(122,594)	(351,856)
Income tax expense related to reclassification adjustment for write-down of securities included in net income	116,027	132,626
Net income tax expense on other comprehensive income	934,906	524,671
Other comprehensive income	1,820,460	958,447
Comprehensive income	$ 8,754,396	$ 7,331,073