FAIR VALUE MEASUREMENTS (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Financial Assets:
Cash and cash equivalents	$ 65,027,000	$ 53,817,000	$ 33,285,000	$ 10,390,000
Restricted cash	7,130,000	7,164,000
Pledged securities and cash	33,481,000	18,959,000
Derivative assets	21,258,000	10,638,000
Financial Liabilities:
Derivative liabilities	867,000	5,223,000
Warehouse notes payable	1,084,539,000	218,426,000
Notes payable	80,925,000	23,869,000
Period of originated loans within which they are transferred or sold	60 days
Maximum term of interim loans	2 years
Maximum
Financial Liabilities:
Term of maturity of investments	90 days
Carrying Amount
Financial Assets:
Cash and cash equivalents	65,027,000	53,817,000
Restricted cash	7,130,000	7,164,000
Pledged securities and cash	33,481,000	18,959,000
Loans held for sale	1,101,561,000	268,167,000
Loans held for investment	9,468,000
Derivative assets	21,258,000	10,638,000
Total financial assets	1,237,925,000	358,745,000
Financial Liabilities:
Derivative liabilities	867,000	5,223,000
Warehouse notes payable	1,084,539,000	218,426,000
Notes payable	80,925,000	23,869,000
Total financial liabilities	1,166,331,000	247,518,000
Fair Value
Financial Assets:
Cash and cash equivalents	65,027,000	53,817,000
Restricted cash	7,130,000	7,164,000
Pledged securities and cash	33,481,000	18,959,000
Loans held for sale	1,101,561,000	268,167,000
Loans held for investment	9,500,000
Derivative assets	21,258,000	10,638,000
Total financial assets	1,237,957,000	358,745,000
Financial Liabilities:
Derivative liabilities	867,000	5,223,000
Warehouse notes payable	1,084,539,000	218,426,000
Notes payable	80,925,000	23,869,000
Total financial liabilities	$ 1,166,331,000	$ 247,518,000