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Consolidated Statements Of Comprehensive Income (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Consolidated Statements Of Comprehensive Income [Abstract]    
Net income $ 3,386,418 $ 1,432,139
Other comprehensive income, before tax:    
(Accretion) amortization related to prior year service cost (380) 2,349
Amortization of unrecognized loss 1,573 170
Unrealized gains on investments arising during the period 2,398,989 1,996,426
Reclassification adjustment for sale of securities included in net income (34,829) (192,881)
Reclassification adjustment for write-down of securities included in net income 18,485 0
Other comprehensive income, before tax 2,383,838 1,806,064
Income tax expense related to postretirement health benefits 405 857
Income tax expense related to unrealized gains on investments arising during the year 828,745 691,943
Income tax benefit related to reclassification adjustment for sale of securities included in net income (11,989) (66,056)
Income tax expense related to reclassification adjustment for write-down of securities included in net income 7,127 0
Net income tax expense on other comprehensive income 824,288 626,744
Other comprehensive income 1,559,550 1,179,320
Comprehensive income 4,945,968 2,611,459
Less: Comprehensive income attributable to redeemable noncontrolling interest (9,688) 0
Comprehensive income attributable to the Company $ 4,936,280 $ 2,611,459