CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flow from operating activities:
Net income	$ 66,190,438	$ 63,067,857
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	1,036,916	1,281,910
Amortization of loan costs and discounts	406,812	280,043
Provision for loan losses	93,411,187	89,005,511
Amortization of convertible note discount	0	1,819,600
Depreciation	4,683,781	4,773,549
Deferred income tax benefit	(9,773,789)	(6,683,729)
Compensation related to stock option and restricted stock plans	6,735,222	4,897,230
Unrealized gains on interest rate swap	0	(319,235)
Change in accounts:
Other assets, net	(1,815,636)	(104,144)
Income taxes payable	(6,362,166)	(7,583,342)
Accounts payable and accrued expenses	1,458,764	(137,087)
Net cash provided by operating activities	155,971,529	150,298,163
Cash flows from investing activities:
Increase in loans receivable, net	(224,259,715)	(210,760,223)
Net assets acquired from office acquisitions, primarily loans	(1,263,798)	(2,419,787)
Purchases of property and equipment	(5,355,655)	(4,752,260)
Increase in intangible assets from acquisitions	(424,192)	(640,570)
Net cash used in investing activities	(231,303,360)	(218,572,840)
Cash flow from financing activities:
Borrowings from lines of credit	401,600,466	352,985,000
Payments on lines of credit	(138,150,466)	(156,320,000)
Repayment of the convertible senior subordinated notes payable	0	(77,000,000)
(Payments on)/proceeds from junior subordinated note payable	(50,000,000)	20,000,000
Proceeds from exercise of stock options	7,120,171	8,460,809
Repurchase of common stock	(141,020,900)	(73,983,889)
Excess tax benefits from exercise of stock options	2,262,766	914,886
Net cash provided by financing activities	81,812,037	75,056,806
Increase in cash and cash equivalents	6,480,206	6,782,129
Effects of foreign currency fluctuations on cash	(74,029)	(547,186)
Cash and cash equivalents at beginning of period	10,768,176	8,030,580
Cash and cash equivalents at end of period	$ 17,174,353	$ 14,265,523