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Consolidated Statements Of Comprehensive Income - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income $ 8,129,167 $ 4,495,498 $ 14,463,675 $ 10,342,119
Other comprehensive income, before tax:        
Amortization related to prior year service cost 0 1,098 0 3,293
Amortization of unrecognized loss 2,235 878 6,705 2,635
Unrealized (losses) gains on investments arising during the period (769,328) (2,359,495) 3,518,286 (4,223,992)
Reclassification adjustment for sales of securities included in net income (545,925) (458,058) (785,517) (1,390,070)
Reclassification adjustment for write-downs of securities included in net income 118,703 657,755 233,941 668,904
Other comprehensive (loss) income, before tax (1,194,315) (2,157,822) 2,973,415 (4,939,230)
Income tax expense related to postretirement health benefits 759 672 2,279 2,016
Income tax (benefit) expense related to unrealized (losses) gains on investments arising during the period (280,327) (809,994) 1,193,241 (1,446,083)
Income tax benefit related to reclassification adjustment for sales of securities included in net income (185,316) (156,447) (268,548) (474,198)
Income tax expense related to reclassification adjustment for write-downs of securities included in net income 40,555 225,293 79,900 229,093
Net income tax (benefit) expense on other comprehensive (loss) income (424,329) (740,476) 1,006,872 (1,689,172)
Other comprehensive (loss) income (769,986) (1,417,346) 1,966,543 (3,250,058)
Comprehensive Income 7,359,181 3,078,152 16,430,218 7,092,061
Comprehensive (income) loss attributable to noncontrolling interests (2,228) (4,536) 6,684 (4,536)
Comprehensive Income Attributable to the Company $ 7,356,953 $ 3,073,616 $ 16,436,902 $ 7,087,525