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Consolidated Statements Of Comprehensive Income (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]        
Net income $ 4,024,050 $ 3,372,701 $ 7,410,468 $ 4,804,840
Other comprehensive income, before tax:        
(Accretion) amortization related to prior year service cost (379) 2,349 (759) 4,698
Amortization of unrecognized loss 1,574 170 3,147 340
Unrealized (losses) gains on investments arising during the period (1,649,518) (461,611) 749,471 1,534,815
Reclassification adjustment for sale of securities included in net income (70,857) (141,687) (105,686) (334,568)
Reclassification adjustment for write-down of securities included in net income 15,585 76,539 34,070 76,539
Other comprehensive (loss) income, before tax (1,703,595) (524,240) 680,243 1,281,824
Income tax expense related to postretirement health benefits 408 856 813 1,713
Income tax (benefit) expense related to unrealized (losses) gains on investments arising during the year (568,422) (155,412) 260,323 536,531
Income tax benefit related to reclassification adjustment for sale of securities included in net income (24,609) (55,280) (36,598) (121,336)
Income tax expense related to reclassification adjustment for write-down of securities included in net income 6,007 26,265 13,134 26,265
Net income tax (benefit) expense on other comprehensive (loss) income (586,616) (183,571) 237,672 443,173
Other comprehensive (loss) income (1,116,979) (340,669) 442,571 838,651
Comprehensive Income 2,907,071 3,032,032 7,853,039 5,643,491
Less: Comprehensive income attributable to redeemable noncontrolling interest (18,375) (23,213) (28,063) (23,213)
Comprehensive Income Attributable to the Company $ 2,888,696 $ 3,008,819 $ 7,824,976 $ 5,620,278