Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 6,839,384	$ 819,926	$ 16,872,598	$ 1,331,873
Unrealized gain on securities:
Unrealized holding income during the period, net of income tax	6,527,358	9,375,803	11,096,463	17,529,346
Reclassification adjustment for gains included in net income (loss), net of income tax	(866,010)	(1,622,682)	(3,399,297)	(4,717,484)
Other comprehensive income	5,661,348	7,753,121	7,697,166	12,811,862
Comprehensive income	$ 12,500,732	$ 8,573,047	$ 24,569,764	$ 14,143,735