CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Interest and fee income	$ 130,311,649	$ 117,112,842	$ 367,428,701	$ 340,693,868
Insurance commissions and other income	19,327,915	18,833,629	54,445,073	50,547,636
Total revenues	149,639,564	135,946,471	421,873,774	391,241,504
Expenses:
Provision for loan losses	37,394,633	36,109,128	93,411,187	89,005,511
General and administrative expenses:
Personnel	48,319,205	42,097,880	141,401,829	127,475,303
Occupancy and equipment	9,109,693	8,343,121	26,890,979	25,281,745
Advertising	6,535,782	5,854,480	11,981,428	11,336,222
Amortization of intangible assets	329,196	414,913	1,036,916	1,281,910
Other	10,503,986	9,523,762	28,803,845	26,835,766
Total general and administrative expenses	74,797,862	66,234,156	210,114,997	192,210,946
Interest expense	4,403,866	3,338,048	12,396,058	10,668,984
Total expenses	116,596,361	105,681,332	315,922,242	291,885,441
Income before income taxes	33,043,203	30,265,139	105,951,532	99,356,063
Income taxes	12,369,212	10,683,304	39,761,094	36,288,206
Net income	$ 20,673,991	$ 19,581,835	$ 66,190,438	$ 63,067,857
Net income per common share:
Basic (in dollars per share)	$ 1.61	$ 1.33	$ 5.04	$ 4.19
Diluted (in dollars per share)	$ 1.58	$ 1.30	$ 4.93	$ 4.08
Weighted average common shares outstanding:
Basic (in shares)	12,837,327	14,747,139	13,144,131	15,046,415
Diluted (in shares)	13,100,289	15,119,679	13,431,268	15,453,573