Consolidated Statements Of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 3,398,044	$ 4,024,050	$ 4,383,559	$ 7,410,468
Other comprehensive income, before tax:
Amortization (accretion) related to prior year service cost	555	(379)	1,109	(759)
Amortization of unrecognized loss	0	1,574	0	3,147
Unrealized gains (losses) on investments arising during the period	2,208,475	(1,649,518)	2,984,115	749,471
Reclassification adjustment for sales of securities included in net income	(68,364)	(70,857)	(833,636)	(105,686)
Reclassification adjustment for write-downs of securities included in net income	0	15,585	0	34,070
Other comprehensive income (loss), before tax	2,140,666	(1,703,595)	2,151,588	680,243
Income tax expense related to postretirement health benefits	189	408	377	813
Income tax expense (benefit) related to unrealized gains (losses) on investments arising during the year	761,231	(568,422)	1,031,035	260,323
Income tax benefit related to reclassification adjustment for sales of securities included in net income	(23,213)	(24,609)	(285,750)	(36,598)
Income tax expense related to reclassification adjustment for write-downs of securities included in net income	0	6,007	0	13,134
Net income tax expense (benefit) on other comprehensive income (loss)	738,207	(586,616)	745,662	237,672
Other comprehensive income (loss)	1,402,459	(1,116,979)	1,405,926	442,571
Comprehensive Income	4,800,503	2,907,071	5,789,485	7,853,039
Comprehensive income attributable to redeemable noncontrolling interest	(24,446)	(18,375)	(23,523)	(28,063)
Comprehensive Income Attributable to the Company	$ 4,776,057	$ 2,888,696	$ 5,765,962	$ 7,824,976