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Consolidated Statements Of Comprehensive Income - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 5,926,615 $ 8,129,167 $ 16,066,818 $ 14,463,675
Other comprehensive income, before tax:        
Amortization of unrecognized loss 2,153 2,235 6,459 6,705
Unrealized gains (losses) on investments arising during the period 1,878,509 (769,328) 4,940,599 3,518,286
Reclassification adjustment for sales of securities included in net income (803,938) (545,925) (976,888) (785,517)
Reclassification adjustment for write-downs of securities included in net income 0 118,703 0 233,941
Other comprehensive income (loss), before tax 1,076,724 (1,194,315) 3,970,170 2,973,415
Income tax expense related to postretirement health benefits 732 759 2,194 2,279
Income tax expense (benefit) related to unrealized gains (losses) on investments arising during the period 642,992 (280,327) 1,687,783 1,193,241
Income tax benefit related to reclassification adjustment for sales of securities included in net income (274,419) (185,316) (334,054) (268,548)
Income tax expense related to reclassification adjustment for write-downs of securities included in net income 0 40,555 0 79,900
Net income tax expense (benefit) on other comprehensive income (loss) 369,305 (424,329) 1,355,923 1,006,872
Other comprehensive income (loss) 707,419 (769,986) 2,614,247 1,966,543
Comprehensive Income 6,634,034 7,359,181 18,681,065 16,430,218
Comprehensive (gain) loss attributable to noncontrolling interests (158) (2,228) 10,886 6,684
Comprehensive Income Attributable to the Company $ 6,633,876 $ 7,356,953 $ 18,691,951 $ 16,436,902